Determining Your Ventilation Needs. Honeywell VNT5200E1000, VNT5150H1000, VNT5150E1000, VNT5200H1000
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Determining Your Ventilation Needs
How much fresh air do you need?
Good air quality is based in part on the capacity of the home’s ventilation system. Usually, the unit’s capacity is measured in CFM (Cubic Feet per Minute) or L/s (Liters per second) of fresh air being distributed in the living space. Use the ASHRAE 62.2 Ventilation Standard, the Room Count Calculation Method, or the
Air Change Per Hour (ACH) Method to determine your ventilation needs.
ASHRAE 62.2 Ventilation Standard
ASHRAE 62.2 CFM Sizing Chart
Floor Area (ft
2
)
< 1500
1501 - 3000
3001 - 4500
Number of Bedrooms / CFM
0-1 2-3
30 45
45
60
60
75
4-5
60
75
90
6-7
75
90
105
4501 - 6000
6001 - 7500
> 7500
75
90
105
90
105
120
105
120
135
120
135
150
ANSI/ASHRAE STANDARD 62.2-2007 - Ventilation Air Requirements; values in cfm
The above chart outlines the minimum requirements for continuous ventilation.
135
150
165
>7
90
105
120
Room Count Calculation Method
Living Space
Master Bedroom
Basement
Single bedroom
Living Room
Dining Room
Family Room
Recreation Room
Other
Kitchen
Bathroom
Laundry Room
Utility Room
Number of Rooms x CFM (or L/s)
x 20 cfm (or 10 L/s) x 20 cfm (or 10 L/s) x 10 cfm (or 5 L/s) x 10 cfm (or 5 L/s) x 10 cfm (or 5 L/s) x 10 cfm (or 5 L/s) x 10 cfm (or 5 L/s) x 10 cfm (or 5 L/s) x 10 cfm (or 5 L/s) x 10 cfm (or 5 L/s) x 10 cfm (or 5 L/s) x 10 cfm (or 5 L/s)
=
=
=
=
=
=
=
=
=
= CFM Required
=
=
=
Total Ventilation Requirement
=
Air Change Per Hour (ACH) Method
TOTAL cubic feet X 0.35 per hour = total cubic feet per hour
Take total and divide by 60 to get cubic feet per minute (CFM)
Example: A 25 ft. x 40 ft. (1,000 sq. ft.) house with basement
1,000 sq. ft. x 8 ft. high x 2 (1st floor + basement) = 16,000 cu. ft.
16,000 cu. ft. x 0.35 ACH = 5,600 cubic feet per hour
5,600 cu. ft. / 60 Minutes = 93 cubic feet per minute (CFM)
93 CFM is your ventilation need
ERV/HRV Ventilation Systems 69-2480EF—01 3
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Key Features
- Improves indoor air quality by removing pollutants, allergens, and moisture.
- Recovers heat and moisture from the outgoing air stream, reducing energy costs.
- Helps to prevent condensation and mold growth.
- Provides a constant supply of fresh air, even when windows and doors are closed.
- Can be controlled manually or with an optional remote control or wall-mounted thermostat.
- Easy to install and maintain.