Retrotec Residential Pressure & Air Leakage - Manual (Page 60)

Page 60 of 75
©Retrotec Inc. 2014
Air Tightness Requirements for Assemblies
Table 17: Air tightness requirements for Assemblies
Standard
Region Comments Requirement
ACH50
n
50
CFM
75
/sq ft
(m 3 /hr)
50
/m 2
North America
Canadian NBC for RH
Canada
0.1 (L/s 50)/m 2 0.26
0.02 0.28
National Canadian Building
Code
Canada
Assemblies 0.15 (L/s 50)/m 2 0.33
0.025 0.35
Comparison of different Air Leakage Results for the same enclosure
Table 18: Comparison of different units for a house 50 x 30 x 20 feet, with n=0.65; proposed units are highlighted
Result
Units Application
1,191 CFM50 House leakage in the US
1,550 CFM75 Large building leakage in the US
0.397 CFM50/sq ft House and duct leakage in the US
0.253 CFM50/sq ft House and duct leakage in the US, MLR
0.192 CFM50/sq ft House and duct leakage in the US
0.250 CFM75/sq ft Large building leakage in the US
0.249 (CFM @ 0.3 in WC)/sq ft Large building leakage in the US
66 sq in EfLA4 House leakage in the US
1.06 sq in EfLA4/100 sq ft Environmental Tobacco Smoke - apartment leakage in the US
123 sq in EqLA10 House leakage in Canada and US
157 sq in EqLA50
1.98 sq in EqLA10/100 sq ft
2.53 sq in EqLA50/100 sq ft
2.38 ACH50, n
50
Proposed for houses and large buildings worldwide
0.000107 SLA, sq in EfLA50/ sq in House leakage in WA state must be 0.00030 or less
107 EfLA50/10 6 sq in
175 EqLA50/10 6 sq in (surface area) Proposed for all buildings
0.56 Q50, m 3 /s Large building leakage in Europe
196 V
4 ,
m 3 /h All building leakage in France
2,023 V
50 ,
m 3 /h Large building leakage in Europe