Retrotec Residential Pressure & Air Leakage User Manual
Page 61
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
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