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4
Determining your airflow requirement
1 CFM = 0.47 L/s
1 L/s = 2.13 CFM
Room Count Method
Room classification Number of rooms
Master bedroom
Basement
Bedrooms
Living room
Others
Kitchen
Bathroom
Laundry room
Utility room yes or no
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)
CFM Required
=
=
=
=
=
=
=
=
=
Total Ventilation Requirements (add last column )
=
ASHRAE method
Ft2
< 1500
1501-3000
3001-4500
4501-6000
6001-7500
>7500
Floor area m2
<139
139.1-279
279.1-418
418.1-557
557.1-697
>697
CFM
30
45
60
75
90
105
0-1
14
21
28
35
42
50
L/s
Ventilation Air requirements
CFM
2-3
L/s
Bedrooms
4-5
CFM L/s
45
60
75
90
105
120
21
28
35
42
50
57
60
75
90
105
120
135
28
35
45
50
57
64
* ASHRAE 62.2-2010 Table 4.1, Ventilation and Acceptable Indoor Air Quality in Low-Rise Residential Buildings.
CFM
75
90
105
120
135
150
6-7
L/s
35
42
50
57
64
71
CFM
90
105
120
135
150
165
>7
L/s
42
50
57
64
71
78
4 fantech
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