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Determining your airflow requirement
Room Count Method
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 ERV 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.
Operating conditions
This ventilation system is designed to operate under standard humidity and temperature conditions. However, some extreme conditions may cause the
exchanger to freeze or produce an excessive amount of water condensation. This ventilation system should not be operated with an indoor humidity
above 50% in combination with an outdoor temperature below -10°C (14°F) for more than 12 continuous hours.
Residential ERV ventilation systems are not suitable for pool or spa applications.
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
=
=
=
=
=
=
=
=
=
=
L/s
42
50
57
64
71
78
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