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Retrotec Residential Pressure & Air Leakage User Manual

Page 61

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Page 61 of 75

Result

Units

Application

3.5115

Permeability, (m

3

/h)/m

2

Large building leakage in the UK

4.63

Air Leakage index, (m

3

/h)/m

2

Large building leakage in the UK

562

Q50, L/s

House leakage in Canada and Europe

731

Q75, L/s

Large building leakage in Canada and Europe

0.98

(L/s 50)/m

2

Large building leakage in Canada and Europe @ 50 Pa

1.27

(L/s 75)/m

2

Large building leakage in Canada and Europe @ 75 Pa

428

cm

2

EfLA4

0.74

cm

2

EfLA4/ m

2

794

cm

2

EqLA10

House leakage in Canada

1,010

cm

2

EqLA50

House leakage in Canada and Europe

1.38

NLA, cm

2

EqLA10/m

2

House leakage in Canada

1.75

cm

2

EqLA50/m

2

Large building leakage in Canada and Europe

1.35

(cm

2

[email protected])/m

2

House leakage per unit floor are in Japan at 9.8 Pa

Table 19: Description of units used in requirements for air leakage

Acronym

Requirement units

Description

ACH50, n

50

/h

Air Changes per Hour, at 50 Pa induced pressure

CFM50/sq ft

Cubic feet per minute, at 50 Pa induced pressure, per square foot of total enclosure
surface area

CFM75/sq ft

Cubic Feet per Minute, at 75 Pa per square foot of total enclosure surface area

cm

2

EqLA50/m

2

Square centimeters of Equivalent Leakage Area, at 50 Pa induced pressure, per square
metre of enclosure surface area

EfLA50/10

6

Surface area

Effective Leakage Area, at 50 Pa induced pressure, per million units of envelope area

EqLA50/10

6

Surface area

Equivalent Leakage Area, at 50 Pa induced pressure, per million units of envelope area

(L/s)/m

2

Litres per second per square metre of enclosure surface area

(L/s 50)/m

2

Litres per second per square metre of enclosure surface area, at 50 Pa induced pressure

(m

3

/h)/m

2

Permeability or air leakage index usually taken at 50 Pa induced pressure

(m

3

/h 50)/m

2

Cubic metres per hour, at an induced pressure of 50 Pa, per square metre of total
enclosure area to outdoors including the ground. Usually under pressurization only
although most Standards recommend testing both ways.

NLA

sq in/sq ft

Square inches of EqLA referenced to 10Pa per square foot of floor area.

Q50

L/s

Volumetric air flow rate, in litres per second at 50 Pa induced pressure

ELA

sq in EfLA4

Square inches of Effective Leakage Area at a reference pressure of 4 Pa extrapolated
from multiple test points taken between 15 and 60 Pa under depressurization.

sq in EfLA4/100 sq ft

Square inches of Effective Leakage Area at 4 Pa per 100 square feet of enclosure surface
area extrapolated from multiple test points taken between 15 and 60 Pa under
depressurization

V

4

m

3

/h

Volumetric air flow rate, in cubic meters per hour at 4 Pa induced pressure