GeneralAire ERV 3220 - Manual (Page 3)

3
Determine your
ventilation needs
installation
How much fresh air do I need? Good air
quality is based in part on the capacity
of the home’s ventilation system.
Usually, the HRV’s or ERVs capacity is
measured in CFM (cubic feet per
minute) or L/s (Liters per seconds) of
fresh air being distributed in the living
space. The room count calculation or the
air change per hour method shows you
how to determine your ventilation needs.
Independent system
installation
This application uses a
devoted duct system for the
supply and the exhausting
of stale air accumulated
in the home.
It is recommended to install
fresh air grilles in all
bedrooms and living areas. Exhaust
the stale air from the bathroom,
kitchen and laundry room.
Independent System
A. Room count calculation
B. Air change per hour method
2. Types of Installation
1.Ventilation Needs
LIVING SPACE
Master Bedroom
With Basement
Without Basement
Single Bedroom
Living Room
Dinning Room
Family Room
Recreation Room
Other
Kitchen
Bathroom
Laundry Room
Utility Room
TOTAL cu ft x 0.35 per hr = total
Take total and divide by 60 to get CFM
Number of Rooms CFM (L/s) CFM Required
x 20 cfm (10 L/s)=
x 20 cfm (10 L/s)=
x 10 cfm (5 L/s)=
x 10 cfm (5 L/s)=
x 10 cfm (5 L/s)=
x 10 cfm (5 L/s)=
x 10 cfm (5 L/s)=
x 10 cfm (5 L/s)=
x 10 cfm (5 L/s)=
x 10 cfm (5 L/s)=
x 10 cfm (5 L/s)=
TOTAL ventilation requirement (add last column)=
1 CFM = 0.47189 L/s
1 L/s = 3.6 m 3 /hr
Example: 25' x 40' house with basement
1,000 sq. ft. x 8' high x 2 (1st floor + basement) = 16,000 cu. ft.
16,000 cu. ft. x 0.35 ACH = 5,600 cu. ft.
5,600 cu. ft./60 minutes = 93 CFM
93 CFM is your ventilation need