4
Room classification Number of rooms
CFM (L/s)
CFM Required
Master bedroom
x 10 L/s (20 CFM)
=
Basement
yes or no
=
Bedrooms
x 5 L/s (10 CFM)
=
Living room
x 5 L/s (10 CFM)
=
Others
x 5 L/s (10 CFM)
=
Kitchen
x 5 L/s (10 CFM)
=
Bathroom
x 5 L/s (10 CFM)
=
Laundry room
x 5 L/s (10 CFM)
=
Utility room
x 5 L/s (10 CFM)
=
Total Ventilation Requirements
(add last column )
=
if yes add 10 L/s (20 CFM)
if no = 0
1 CFM = 0.47 L/s
1 L/s = 2.13 CFM
Room Count Method
Determining your airflow requirement
ASHRAE method
Ventilation Air requirements
Floor area
Bedrooms
0-1
2-3
4-5
6-7
>7
Ft2
m2
CFM
L/s
CFM
L/s
CFM
L/s
CFM
L/s
CFM
L/s
< 1500
<139
30
14
45
21
60
28
75
35
90
42
1501-3000
139.1-279
45
21
60
28
75
35
90
42
105
50
3001-4500
279.1-418
60
28
75
35
90
45
105
50
120
57
4501-6000
418.1-557
75
35
90
42
105
50
120
57
135
64
6001-7500
557.1-697
90
42
105
50
120
57
135
64
150
71
>7500
>697
105
50
120
57
135
64
150
71
165
78
* 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.
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