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DETERMINING YOUR AIRFLOW REqUIREMENT
1 CFM = 0.47 L/s
1 L/s = 2.13 CFM
ASHRAE method
Floor area
2
Ft
< 1500
<139
1501-3000
139.1-279
3001-4500
279.1-418
4501-6000
418.1-557
6001-7500
557.1-697
>7500
>697
* ASHRAE 62.2-2010 Table 4.1, Ventilation and Acceptable Indoor Air Quality in Low-Rise Residential Buildings.
Bathroom: If the HRV is going to provide the required local exhaust ventilation for each bathroom with each a con-
tinuous 20 CFM (10 L/s), this ventilation rate can be considered as part of the whole-building ventilation rate.
4
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Room Count Method
Room classification
Master bedroom
Basement
Bedrooms
Living room
Others
Kitchen
Bathroom
Laundry room
Utility room
Ventilation Air requirements
0-1
2
m
CFM
L/s
30
14
45
21
60
28
75
35
90
42
105
50
Number of rooms
yes or no
Total Ventilation Requirements (add last column )
Bedrooms
2-3
4-5
CFM
L/s
CFM
45
21
60
60
28
75
75
35
90
90
42
105
105
50
120
120
57
135
CFM (L/s)
x 10 L/s (20 CFM)
if yes add 10 L/s (20 CFM)
if no = 0
x 5 L/s (10 CFM)
x 5 L/s (10 CFM)
x 5 L/s (10 CFM)
x 5 L/s (10 CFM)
x 5 L/s (10 CFM)
x 5 L/s (10 CFM)
x 5 L/s (10 CFM)
6-7
L/s
CFM
L/s
28
75
35
35
90
42
45
105
50
50
120
57
57
135
64
64
150
71
CFM Required
=
=
=
=
=
=
=
=
=
=
>7
CFM
L/s
90
42
105
50
120
57
135
64
150
71
165
78
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