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DETERMINING YOUR AIRFLOW REQUIREMENT
1 CFM = 0.47 L/s
1 L/s = 2.13 CFM
ASHRAE method
Floor area
Ft 2
m 2
<500
<47
501-1000
47-93
1001-1500
94-139
1501-2000
140-186
2001-2500
187-232
2501-3000
233-279
3001-3500
280-325
3501-4000
326-372
4001-4500
373-418
4501-5000
419-465
* ASHRAE 62.2-2016 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 continuous 20 CFM
(10 L/s), this ventilation rate can be considered as part of the whole-building ventilation rate.
Room Count Method
Room classification
Master bedroom
Basement
Bedrooms
Living room
Others
Kitchen
Bathroom
Laundry room
Utility room
Ventilation Air requirements
1
2
CFM
L/s
CFM
30
128
38
45
21
53
60
28
68
75
35
83
90
42
98
105
49
113
120
56
128
135
63
143
150
70
158
165
77
173
Number of rooms
if yes add 10 L/s (20 CFM)
yes or no
if no = 0
Total Ventilation Requirements (add last column )
Bedrooms
3
L/s
CFM
L/s
CFM
18
45
21
24
60
28
31
75
35
38
90
42
45
105
49
113
52
120
56
128
59
135
63
143
66
150
70
158
73
165
77
173
80
180
84
188
CFM (L/s)
CFM Required
x 10 L/s (20 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)
x 5 L/s (10 CFM)
4
5
L/s
CFM
53
25
60
68
31
75
83
38
90
98
45
105
52
120
59
135
66
150
73
165
80
180
87
195
=
=
=
=
=
=
=
=
=
=
L/s
28
35
42
49
56
63
70
77
84
91
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