Determining Your Airflow Requirement - Fantech VHR 70 Mode D'emploi

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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.
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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
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
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L/s
28
35
42
49
56
63
70
77
84
91