JP2001091397A - Airtightness measurement method of building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for easily measuring the airtightness of a building without requiring exclusive airtightness measurement facilities, or the like. SOLUTION: In the method for measuring the airtightness of a unit-type building 1 according to pressure difference ΔP inside and outside the unit-type building 1, a supply and exhaust fan 20 being used as supply and exhaust facilities being provided at the unit-type building 1 in advance, and a range fan 30 in a kitchen are used for sucking or exhausting air, thus generating the pressure difference ΔP inside and outside the unit-type building 1, and hence measuring the airtightness of the unit-type building 1. By the method, the airtightness of the unit-type building 1 is easily measured without requiring exclusive airtightness measurement facilities, ducts, or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring airtightness of a building such as a highly airtight building.

[0002]

2. Description of the Related Art In recent years, airtight buildings are often built for the purpose of improving the air conditioning efficiency of houses. 2. Description of the Related Art Conventionally, as a method for measuring the airtightness of a building, there is a method described in “Manual for Testing Security Performance of House” (published by the Japan Housing and Energy Conservation Agency) (hereinafter referred to as a manual). The method described in this manual is to cover the opening with a non-permeable member provided with holes, connect the duct to the hole provided in this member, and then operate the fan provided in the duct. Supply air to the inside of the building or exhaust to the outside of the building, measure the air flow at the time of air supply and exhaust with a flow rate measuring device, and measure the pressure difference generated inside and outside the building by the air supply and exhaust with the pressure difference measuring device Then, the airtightness of the building is obtained from these measured values.

[0003]

However, in order to execute this method, a member having no air permeability covering the opening is required, and special equipment such as a duct and a fan dedicated to measurement is required. Therefore, in a normal building,
There is a problem that it is difficult to easily perform airtight measurement, and there is a demand for a method that can easily perform airtight measurement of a building without requiring special equipment.

An object of the present invention is to provide a method for measuring the airtightness of a building, which can easily measure the airtightness of the building without requiring any equipment dedicated for airtightness measurement.

[0005]

SUMMARY OF THE INVENTION The present invention achieves the above object by measuring airtightness by generating a pressure difference between inside and outside of a building by using an air intake and exhaust system provided in the building in advance. Things.

Specifically, referring to the drawings, the invention according to claim 1 is a pressure difference ΔP generated inside and outside a building 1.
A method for measuring the airtightness of a building 1 from which the airtightness of the building 1 is measured, comprising:
A method for measuring the airtightness of a building, characterized in that the airtightness of the building 1 is measured by causing a pressure difference ΔP between the inside and the outside of the building 1 by performing intake or exhaust using the airbag 30.

In the present invention, as an apparatus used in the airtightness measuring method, for example, an air supply / exhaust facility provided in a building, a flow rate measuring apparatus for measuring a flow rate of air supplied / exhausted by the air supply / exhaust facility, a pressure generated inside and outside the building It can be composed of a pressure difference measuring device for measuring the difference, a thermometer, and the like. Here, examples of the air supply / exhaust equipment include an air supply / exhaust fan, a kitchen range fan, a ventilation fan, a ceiling fan, and the like. Further, the flow rate measuring device is composed of a rectifying cylinder and a measuring sensor, and the rectifying cylinder includes, for example, a duct, and the measuring sensor includes, for example, an anemometer, a pitot tube, an orifice venturi tube, and the like. Can be Examples of the pressure difference measuring device include a manometer and a diaphragm type differential pressure gauge.

According to the present invention, the airtightness of the building is measured by generating a pressure difference between the inside and the outside of the building using the air supply / exhaust equipment provided in the building in advance. Therefore, the airtightness of the building can be easily measured without the necessity of a supply / exhaust facility and a duct dedicated to the airtightness measurement.

According to a second aspect of the present invention, in the method for measuring airtightness of a building according to the first aspect, the building 1 has a plurality of the air supply / exhaust facilities 20 and 30, and the plurality of air supply / exhaust facilities 20 and 30. , 30 are operated at the same time to measure the airtightness of a building.
In the present invention, the plurality of air supply / exhaust facilities of the building include:
As long as the equipment can supply and exhaust air to and from the outside, it may be installed anywhere in the building.

According to the present invention, the building has a plurality of air supply / exhaust facilities, and a part or all of the air supply / exhaust facilities are simultaneously operated to supply or exhaust air. Airtightness can be measured. Therefore, the measurement can be performed while changing the number of the supply / exhaust facilities to be operated as necessary, and the appropriate ventilation rate and pressure difference can be adjusted by selecting the number in consideration of the external environment and the like.

According to a third aspect of the present invention, in the method for measuring airtightness of a building according to the first or second aspect, the building 1 has a cabin back 15 and the air supply / exhaust facility is provided with This is a method for measuring the airtightness of a building, characterized in that the air supply / exhaust fan 20 is provided on the back of the hut 15.

According to the present invention, the air inside the building is exhausted using the air supply / exhaust fan provided at the back of the hut of the building, and a pressure difference is generated inside and outside the building to measure the airtightness. Therefore, not only does the air supply / exhaust equipment dedicated to airtightness measurement need to be provided, but also it is difficult for the pressure difference measuring device usually installed on the lower floor to be affected by the wind generated at the time of air supply / exhaust. Can be. Further, since the air supply / exhaust fan is provided in a place not used as a living space, the dead space can be effectively used.

According to a fourth aspect of the present invention, in the method for measuring airtightness of a building according to the first or second aspect, the building 1 has a kitchen 16 and the air supply / exhaust equipment is installed in the kitchen 16. This is a method for measuring airtightness of a building, wherein the kitchen range fan 30 is provided.

According to the present invention, in a general residential building,
The air inside the building is exhausted to the outside by using a kitchen range fan that is usually provided, and a pressure difference is generated inside and outside the building to measure the airtightness. Therefore, not only the air supply / exhaust equipment dedicated to airtightness measurement is not required, but also airtightness measurement can be easily performed in almost all residential buildings.

According to a fifth aspect of the present invention, in the method for measuring airtightness of a building according to the second aspect, the building 1 is provided with a kitchen 16.
Airtightness measurement of a building, characterized by comprising a kitchen range fan 30 provided in the kitchen 15 and a supply / exhaust fan 20 provided in the cabin 15. Is the way.

According to the present invention, the air inside the building is discharged to the outside by combining the air supply / exhaust fan and the kitchen range fan provided in the back of the hut, and a pressure difference is generated inside and outside the building to measure the airtightness. Becomes Therefore, the exhaust can be performed at different places inside the building, and the airtightness can be quickly measured even in a large house or the like.

According to a sixth aspect of the present invention, in the method for measuring the hermeticity of a building according to any one of the first to fifth aspects, the air supply / exhaust facilities 20 and 30 are provided with a flow rate Q at the time of air supply / exhaust.
And a pressure difference Δ generated between the inside and outside of the building 1 by the air supply and exhaust equipment 20, 30.
An airtightness measuring method for a building, wherein the airtightness of the building 1 is measured based on P and the air flow rate Q.

According to the present invention, the airtightness of the building is measured based on two values, that is, the pressure difference between the inside and outside of the building and the air flow at the time of air supply and exhaust. Therefore, when the pressure difference generated inside and outside the building due to the operation of the air supply and exhaust equipment is small, it may be due to the low airtightness of the building or to the insufficient air flow accompanying the air supply and exhaust. Can be determined, and more accurate airtightness measurement can be performed.

According to a seventh aspect of the present invention, in the method for measuring airtightness of a building according to any one of the first to fifth aspects, the operating time during which the air supply / exhaust facilities 20, 30 are operated is measured. An airtightness measuring method for the building 1 is characterized in that the airtightness of the building 1 is measured from an operation time and a pressure difference ΔP generated inside and outside the building 1 by the air supply / exhaust facilities 20 and 30. Examples of the method of measuring the operation time of the air supply / exhaust facility in the present invention include, for example, a case where a time measurement device is provided in the air supply / exhaust facility and the measurement is performed automatically, and a case where a measurer performing airtight measurement manually performs measurement. .

According to the present invention, when the airtightness of a building is measured using the air supply / exhaust equipment whose air supply / exhaust amount in a predetermined time is checked in advance, the time during which the air supply / exhaust equipment is operated is measured to measure the time. , The airtightness of the building can be measured from this value and the pressure difference between the inside and outside of the building caused by the supply and exhaust. Therefore, the flow rate measuring device is not required, and the measuring device can be simplified.

According to an eighth aspect of the present invention, in the method for measuring airtightness of a building according to any one of the first to seventh aspects, the air supply and exhaust between the air supply and exhaust equipment 20, 30 and the standard air supply and exhaust equipment are provided. This is a method for measuring airtightness of a building, characterized in that a measurement value is corrected in accordance with a capacity difference. In the present invention, examples of the standard supply / exhaust facility include a supply / exhaust facility specified in a manual.

According to the present invention, according to the difference between the supply / exhaust capacity of the supply / exhaust facility of the building and the supply / exhaust capacity of the standard supply / exhaust facility,
By correcting the measured values, the evaluation of the airtightness of the building described in the manual can be applied as it is, which is convenient.

[0023]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a unit-type building 1 as a building provided with air supply / exhaust equipment for executing the method for measuring airtightness of a building of the present invention. Unit type building 1
Is constructed on a foundation 10 and is provided with a plurality of box-shaped building units 11 and placed on these building units 11, that is, installed on the back of a hut 15 of the unit-type building 1. And a wedge-shaped triangular roof unit 13. Here, the hut back unit 12 forms a hut back room on the hut back 15, and the triangular roof unit 12 supports a roof 14 formed by combining roof panels. In addition, the building unit 11, the hut back unit 1
2 and the triangular roof unit 13 are manufactured in advance in a factory and transported to a construction site.

As shown in FIG. 2, one of the triangular roof units 13 provided on the back of the hut 15 of the unit building 1 is provided with a supply / exhaust fan 20 as an air supply / exhaust facility. The air supply / exhaust fan 20 includes an air supply / exhaust fan main body 21 and an air inlet 22 that sucks air inside the unit-type building 1 and takes it into the air supply / exhaust fan 20.
A supply / exhaust port 23 for exhausting supply air from the intake port 22 or taking in external air into the supply / exhaust fan 20.
It has. The air supply / exhaust port 23 is connected to an exhaust duct 24 and an air supply duct 25 extending to the eaves top 50 of the eaves. The air supply / exhaust fan 20 discharges and introduces air through the ducts 24, 25. Here, each of the ducts 24 and 25 functions as a rectifying cylinder constituting the flow rate measuring device. Further, a ventilation duct 26 extending into the hut back room is connected to the air supply / exhaust fan main body 21, and the ventilation duct 26 is set up along the inner wall 60 of the hut back room and has a tip penetrating the inner wall 60. In addition, the air outlet 27 provided at the tip thereof is attached so as to be in contact with the wall surface of the inner wall 60. Further, a filter 28 is attached to a lower portion of the suction port 22.

As shown in FIG. 3, a kitchen 16 is provided in one of the building units 11 forming the unit-type building 1, and the range table 3 is provided along the wall surface 70 of the kitchen 16.
2 are installed. Wall surface 7 above this range base 32
0, a kitchen range fan 30 for exhausting air as a supply / exhaust facility is provided, and a duct 33 for discharging air generated by the kitchen range fan 30 to the outside is provided on a wall surface 70.
From the outside, and the front surface thereof is covered with a range hood 31. As a result, a plurality of, ie, two air supply / exhaust facilities are provided inside the unit building 1.

A method of measuring the airtightness of the unit-type building 1 using the air supply / exhaust fan 20 and the kitchen range fan 30 as the air supply / exhaust equipment provided inside the unit-type building 1 as described above will be described. First, unit building 1
All the doors (not shown) inside are opened so that the interior of the unit building 1 can be regarded as one living room. At this time, the windows and entrance are locked, and the air supply / exhaust fans (ventilators, etc.) other than those used for measurement are stopped.

Next, as shown in FIG. 4, a differential pressure gauge manometer 41, which is a pressure difference measuring device, is installed inside and outside the unit-type building 1, and the range hood 31 of the kitchen range fan 30 and the supply / exhaust fan 20 are installed. Exhaust duct 24
The anemometer 40 is attached to each. put it here,
The exhaust duct 24 and the anemometer 40 constitute a flow rate measuring device for the supply / exhaust fan 20, and the range hood 31 and the anemometer 40
These constitute a flow rate measuring device for the kitchen range fan 30. The part of the differential pressure gauge manometer 41 installed inside the unit-type building 1 includes the air supply / exhaust facilities 20, 3
It is preferable that the part installed outside the unit-type building 1 in a place that is hardly affected by wind due to zero is installed in a place that is hardly affected by wind and the like outside. Further, a thermometer (not shown) is provided inside and outside the unit-type building 1 to measure the temperature inside the building and the outside temperature at the time of airtightness measurement. The room temperature at the time of measurement is 5 to 35 ° C,
And it is preferable that it is uniform throughout the building.

In this state, the pressure difference ΔP between the inside and outside of the unit type building 1 is measured, and the pressure difference ΔP is a predetermined pressure difference, for example,
After confirming that the pressure is 3 Pa or less, a part or all of the air supply / exhaust facilities are simultaneously operated, that is, the air supply / exhaust fan 20 and / or the kitchen range fan 30 are operated to discharge the air inside the unit building 1. Then, measurement is performed by reducing the pressure inside the unit building 1. At this time, turning on / off the air supply / exhaust fan 20 and / or the kitchen range fan 30
By changing the air flow rate Q accompanying the exhaust by switching off or switching the strength switch, the pressure difference ΔP generated inside and outside the unit-type building 1 is changed, and the measurement range is set at substantially equal intervals.
For example, five points are measured.

The setting range of the pressure difference ΔP at the time of measurement is:
For example, the pressure difference is set to 10 to 100 Pa, and the pressure difference ΔP is read by 1 Pa at the average value when the pressure difference ΔP is stable.
Read and record up to the scale. Then, the air flow rate Q exhausted from the air supply / exhaust fan 20 and / or the kitchen range fan 30 at each set pressure difference ΔP is measured by the anemometer 4.
Measure with 0. Also in this case, similarly to the pressure difference ΔP,
Read the average value as an integer. In a normal measurement, it is preferable to set the pressure difference ΔP in a range of 10 to 50 Pa, and in a measurement in a case where there is a wind, it is preferable to set the pressure difference in a range of 30 to 70 Pa so as to reduce the influence of the wind.

From the measured values of the pressure difference ΔP and the air flow rate Q obtained by the above-mentioned measurements, the following calculation is carried out by ordinary calculation.
The area equivalent to the gap between the outer shells of the unit building 1 is calculated, and the airtight performance is obtained. If the exhaust capacity of the air supply / exhaust fan 20 and the kitchen range fan 30 is different from, for example, standard air supply / exhaust equipment specified in a manual or the like, it is preferable to appropriately correct the obtained measurement values. .

According to the above-described embodiment, the following effects can be obtained. (1) The pressure difference ΔP between the inside and outside of the unit building 1 using the air supply / exhaust fan 20 and / or the kitchen range fan 30 which are the air supply / exhaust facilities provided in the unit building 1 in advance.
, The airtightness of the unit building 1 is measured. Therefore, there is no need to perform installation work such as a supply / exhaust facility and a duct dedicated to airtightness measurement, and airtightness measurement of the unit building 1 can be easily performed. (2) The unit building 1 has two air supply / exhaust facilities, that is, an air supply / exhaust fan 20 and a kitchen range fan 30,
In addition, the airtightness of the unit-type building 1 can be measured by operating part or all of them at the same time to supply air or exhaust air. Therefore, the measurement can be performed by changing the number of the respective air supply / exhaust facilities 20 and 30 to be operated as necessary, and by selecting the number in consideration of the external environment and the like, an appropriate ventilation amount Q and a pressure difference ΔP can be obtained. Can be adjusted.

(3) The air inside the unit-type building 1 is exhausted using the air supply / exhaust fan 20 provided on the back 15 of the unit-type building 1, and the pressure difference Δ
Airtightness is measured by generating P. Therefore, since the air supply / exhaust fan 20 is provided in a place not used as a living space, the dead space can be effectively used. (4) Unit-type building 1 by combining air supply / exhaust fan 20 and kitchen range fan 30 provided in hut back 15
The air inside is exhausted to the outside, and a pressure difference ΔP is generated inside and outside the unit building 1 to measure the airtightness. Therefore, exhaust can be performed at different places inside the unit-type building 1, so that quick measurement is possible.

(5) The airtightness of the unit-type building 1 is measured based on the pressure difference ΔP generated inside and outside the unit-type building 1 and the air flow rate Q at the time of exhaust. Is small due to the low airtightness of the unit building 1,
It can be determined whether or not the air flow rate Q accompanying exhaust is insufficient, and more accurate airtightness measurement can be performed. (6) The air supply / exhaust capacity of each air supply / exhaust facility 20, 30 is compared with the air supply / exhaust capacity of the manual air supply / exhaust equipment, and the measured value is corrected according to the difference, so that the building described in the manual can be used. The evaluation of the airtight performance can be applied as it is. Therefore, accurate evaluation can be obtained even when airtightness measurement is performed using existing air supply and exhaust equipment.

It should be noted that the present invention is not limited to the above embodiment, and modifications and improvements as long as the object of the present invention can be achieved are included in the present invention. For example, in the above embodiment, as the air supply / exhaust equipment, the kitchen range fan 30 of the kitchen 16 and the air supply / exhaust fan 2 of the
Although 0 was used, the invention is not limited to this, and another ventilation fan, ceiling fan, or the like may be used. When the kitchen range fan 30 is not provided, only the air supply / exhaust fan 20 on the back of the hut 15 may be used.
0 is not provided, the kitchen range fan 30
Only one may be used. Since the kitchen range fan 30 is almost provided in a typical residential building, airtightness measurement can be performed in many residential buildings.

In the above-described embodiment, the differential pressure gauge manometer 41 is used as the pressure differential measuring device. However, the present invention is not limited to this. For example, a diaphragm type fine differential pressure gauge may be used, as long as the pressure differential ΔP can be measured. Good. Further, although the anemometer 40 is used as one component of the flow rate measuring device, the present invention is not limited to this, and for example, a pitot tube, an orifice venturi tube or the like may be used.

The airtightness measurement may be performed as follows without using the anemometer 40. That is, the air flow rate Q of the intake / exhaust fan 20 and the kitchen range fan 30 per predetermined time is measured in advance, and the pressure difference ΔP between the inside and outside of the unit-type building 1 when each fan 20, 30 is operated for a predetermined time.
Is measured by a differential pressure gauge manometer 41, and the pressure difference ΔP
Alternatively, the airtightness may be determined from the airflow rate Q checked in advance. Further, in a plurality of buildings, the air supply / exhaust fan 20 and the kitchen range fan 30 of the same standard are set and operated so as to have the same wind power, and the airtightness performance between the buildings is relatively determined using only the pressure difference ΔP generated at that time as an index. For example, it may be evaluated.

In the above embodiment, the unit type building 1
Although the airtightness measurement is performed by the depressurization method of discharging the internal air to reduce the pressure, the airtightness measurement may be performed by the pressurization method using air supply. However, in the case of the pressurization method, in measurements in cold regions, etc., the room temperature decreases and the burden on the measurer increases, so it is better to unify to the decompression method when comparing data, Easy to measure.

In the above embodiment, the unit type building 1
Although the airtightness measurement was performed using the method, the airtightness measurement is not limited thereto, and the airtightness measurement may be performed using a building of another construction method such as a panel-type building or a conventional construction method building.

[0039]

According to the present invention, the following effects can be obtained. That is, according to the first aspect of the invention, the airtightness of the building is measured by generating a pressure difference between the inside and the outside of the building using the air supply / exhaust equipment provided in the building in advance. Therefore, the airtightness of the building can be easily measured without the necessity of a supply / exhaust facility and a duct dedicated to the airtightness measurement.

According to the second aspect of the present invention, the building has a plurality of air supply / exhaust facilities, and some or all of the air supply / exhaust facilities are operated simultaneously to supply air or exhaust air. , The airtightness of the building can be measured. Therefore, the measurement can be performed while changing the number of the supply / exhaust facilities to be operated as needed, and the ventilation rate can be adjusted to an appropriate value by selecting the number in consideration of the external environment and the like.

According to the third aspect of the present invention, air inside the building is exhausted by using an air supply / exhaust fan provided at the back of the hut of the building, and a pressure difference is generated inside and outside the building to measure airtightness. Becomes Therefore, not only does the air supply / exhaust equipment dedicated to airtightness measurement need to be provided, but also it is difficult for the pressure difference measuring device usually installed on the lower floor to be affected by the wind generated at the time of air supply / exhaust. Can be. Also,
Since the supply / exhaust fan is provided in a place not used as a living space, the dead space can be effectively used.

According to the fourth aspect of the present invention, the air inside the building is discharged to the outside by using a kitchen range fan normally provided in a general residential building, and a pressure difference is generated inside and outside the building. Measurement of airtightness. Therefore, not only the air supply / exhaust equipment dedicated to airtightness measurement is not required, but also airtightness measurement can be easily performed in almost all residential buildings.

According to the fifth aspect of the present invention, the air inside the building is exhausted to the outside by combining the air supply / exhaust fan and the kitchen range fan provided in the back of the hut, and a pressure difference is generated inside and outside the building to be airtight. Will be measured. Therefore, exhaust can be performed in different places inside the building,
Airtight measurement can be performed quickly even in a large house.

According to the sixth aspect of the present invention, the airtightness of the building is measured based on two values, that is, the pressure difference between the inside and outside of the building and the air flow at the time of air supply and exhaust. Therefore, when the pressure difference generated inside and outside the building by operating the air supply / exhaust equipment is small, is it due to the low airtightness of the building or due to insufficient air flow accompanying air supply / exhaust? Can be determined, and more accurate airtightness measurement can be performed.

According to the seventh aspect of the present invention, when the airtightness of a building is measured using an air supply / exhaust facility whose air supply / exhaust amount at a predetermined time is checked in advance, the time during which the air supply / exhaust equipment is operated is measured. By doing so, the amount of air supply and exhaust at that time can be known, so that the airtightness of the building can be measured from this value and the pressure difference between the inside and outside of the building caused by the air supply and exhaust. Therefore, the flow rate measuring device is not required, and the measuring device can be simplified.

According to the eighth aspect of the present invention, the measured value is corrected in accordance with the difference between the air supply / exhaust capacity of the air supply / exhaust facility of the building and the air supply / exhaust capacity of the standard air supply / exhaust facility, thereby enabling the manual description. This is convenient because the evaluation of the airtightness of the building can be applied as it is.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a unit-type building showing one embodiment of the present invention.

FIG. 2 is a diagram illustrating a back-floor supply / exhaust fan in the embodiment of FIG. 1;

FIG. 3 is a diagram showing a kitchen range fan in the embodiment of FIG. 1;

FIG. 4 is a schematic configuration diagram of an airtightness measuring device according to the airtightness measuring method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Unit-type building as a building 15 Back of a hut 16 Kitchen 20 Supply / exhaust fan as a supply / exhaust facility 24 Exhaust duct constituting a flow rate measuring apparatus 30 Kitchen range fan as a supply / exhaust facility 31 Range hood constituting a flow rate measuring apparatus 40 Flow rate Anemometer composing the measuring device ΔP Pressure difference Q Air flow

Claims (8)

[Claims] An airtightness measuring method for a building, wherein the airtightness of the building is measured from a pressure difference between the inside and the outside of the building, wherein air intake or exhaust is performed by using an air supply / exhaust facility provided in the building in advance. A method for measuring airtightness of a building, wherein a pressure difference is generated inside and outside the building to measure airtightness of the building. 2. The method for measuring airtightness of a building according to claim 1, wherein said building has a plurality of said air supply / exhaust facilities, and a part or all of said plurality of air supply / exhaust facilities are operated simultaneously to perform measurement. A method for measuring the airtightness of a building, characterized in that it is performed. 3. The method for measuring airtightness of a building according to claim 1, wherein the building has a back of a hut,
The air supply / exhaust facility is an air supply / exhaust fan provided in the back of the hut. 4. The airtightness measuring method for a building according to claim 1 or 2, wherein the building has a kitchen, and the air supply / exhaust equipment is a kitchen range fan provided in the kitchen. Characteristic airtightness measurement method for buildings. 5. The method for measuring airtightness of a building according to claim 2, wherein the building has a kitchen and a back of a cabin, and the air supply / exhaust equipment is provided on a kitchen range fan and a back of the cabin provided in the kitchen. A method for measuring airtightness of a building, wherein the air supply and exhaust fans are provided. 6. The airtightness measuring method for a building according to claim 1, wherein said air supply / exhaust facility includes a flow rate measuring device for measuring a ventilation rate at the time of air supply / exhaust, and A method for measuring airtightness of a building, wherein the airtightness of the building is measured based on a pressure difference generated inside and outside the building by an exhaust system and the air flow rate. 7. The method for measuring airtightness of a building according to claim 1, wherein an operation time during which said air supply / exhaust equipment is operated is measured, and said operation time and said air supply / exhaust equipment are used for inside and outside the building. And measuring the airtightness of the building from the pressure difference generated in the airtightness of the building. 8. The method for measuring airtightness of a building according to claim 1, wherein the measured value is corrected according to a difference in supply / exhaust capacity between the supply / exhaust facility and a standard supply / exhaust facility. A method for measuring the airtightness of a building, characterized in that it is performed.