Determining Your Airflow Requirement - Fantech VHR 704 Manuel D'installation

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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
< 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 continuous 20 CFM
(10 L/s), this ventilation rate can be considered as part of the whole-building ventilation rate.
fantech
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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 2-3
CFM L/s CFM
30 14 45
45 21 60
60 28 75
75 35 90
90 42 105
105 50 120
Number of rooms
if yes add 10 L/s (20 CFM)
yes or no
if no = 0
Total Ventilation Requirements (add last column )
Bedrooms
4-5
L/s CFM L/s CFM
21 60 28
28 75 35
35 90 45 105
42 105 50 120
50 120 57 135
57 135 64 150
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)
6-7 >7
L/s CFM
75 35 90
90 42 105
50 120
57 135
64 150
71 165
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L/s
42
50
57
64
71
78