Brochure
7
AN ALTERNATIVE FORMULA APPROACH TO THE TABLES GIVEN ABOVE.
An alternative formula approach to the tables
given above also exists which typically results
in a lower, more precise CFM requirement.
Under the more common 62.2-2010 version,
continuous CFM requirements can be
calculated using a formula as follows.
CFM = .01 x floor area (in square feet) plus
7.5 x (number of bedrooms + 1).
Example: A 3,500 square foot home with
4 bedrooms would require 73 CFM
.01 x 3,500 = 35
7.5 x (4+1) = 38
Add together for a total of 73 CFM
(as compared to the 90 from the table)
The 62.2-2013 version increases the multiplier
for floor area from .01 to .03. Note however
that infiltration credits can be taken if blower
door testing is conducted.
SELECTING THE PROPER WHOLE HOUSE RESIDENTIAL VENTILATION SOLUTION.
Sizing your solution is a factor of square footage and the number of bedrooms in the dwelling to meet
requirements. These charts are based on ASHRAE 62.2. Note that the 2010 and 2013 versions are
different. Most states still operate under 62.2–2010 rates. Before specifying, check local building codes
to ensure it meets requirements.
2010 Required Continuous Ventilation Rate (CFM)
Floor Area
Sq. Ft.
0–1 BR 2–3 BR 4–5 BR 6–7 BR >7 BR
<1500 30 45 60 75 90
1501–3000 45 60 75 90 105
3001–4500 60 75 90 105 120
4501–6000 75 90 105 120 135
6001–7500 90 105 120 135 150
>7500 105 120 135 150 165
2013 Required Continuous Ventilation Rate (CFM)
Floor Area
Sq. Ft.
0–1 BR 2–3 BR 4–5 BR 6–7 BR >7 BR
<500 30 40 45 55 60
500–1000 45 55 60 70 75
1001–1500 60 70 70 85 90
1501–2000 75 85 90 100 105
2001–2500 90 100 105 115 120
2501–3000 105 115 120 130 135
3001–3500 120 130 135 145 150
>3501 135 145 150 160 165
Fan/Light
Series
Model CFM
0.25"
CFM
Sones
Motor
Type
Sensing
Duct
Size
Page
No.
UltraPro
RN80L 80 60 <0.3 PSC — 4" 11
RN110L 110 91 0.8 PSC — 4" 11
QTXE QTXEN150FLT 150 1.4 PSC — 6" 15
FLEX
AEN80L 80 60 0.8 PSC — 4" 18
AN80L 80 1.0 PSC — 4" 18
AEN110L 110 92 1.0 PSC — 4" 18
Whole House Ventilation Options
Fan Series Model CFM
0.25"
CFM
Sones
Motor
Type
Sensing
Duct
Size
Page
No.
UltraPro
RN80 80 60 <0.3 PSC — 4" 11
RN110 110 91 0.6 PSC — 4" 11
QTXEN
QTXEN080 80 56 0.3 PSC — 6" 14
QTXEN110 110 86 0.7 PSC — 6" 14
LoPro LPN80 80 55 1.0 PSC — 4" or 3" 21
FLEX
AEN50 50 36 0.5 PSC — 4" 18
AEN80 80 60 0.8 PSC — 4" 18
AEN110 110 90 1.0 PSC — 4" 18