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Attic Breeze Solar Attic Fan Sizing
How Much Ventilation Do I Need?
Many variables must be considered when sizing solar
attic fans for a given residential application. The shape
and size of the attic, roof pitch, available air intake vents,
and even roof color all play an important role in
calculating the amount of ventilation needed. Using the
attic space area of your home and roof pitch, the
following tables may be used to provide an estimate of the
number of Attic Breeze® solar attic fans required. Please
contact us for additional assistance in
determining the proper Attic Breeze® model and amount
of ventilation needed for your specific application.
Attic Breeze®
Coverage Area - square feet of
attic space |
Roof Pitch
up to
4/12 |
Roof Pitch
up to
8/12 |
Roof Pitch
up to
12/12 |
< 1600 |
(1) Attic Breeze
|
(1) Attic Breeze
|
(1) Attic Breeze
|
1600 – 2400 |
(1) Attic Breeze
|
(1) Attic Breeze
|
(2) Attic Breeze
|
2400 – 2800 |
(1) Attic Breeze
|
(2) Attic Breeze
|
(2) Attic Breeze
|
2800 – 3200 |
(2) Attic Breeze
|
(2) Attic Breeze
|
(2) Attic Breeze
|
3200 – 4600 |
(2) Attic Breeze
|
(2) Attic Breeze
|
(3) Attic Breeze
|
4600 – 5200 |
(2) Attic Breeze
|
(3) Attic Breeze
|
(3) Attic Breeze
|
| Home square footage |
|
____ sqft |
|
|
account for attached garage
(if not included above) |
+ |
____ sqft |
|
(ex. add 600 sqft for a two car garage; add 900 sqft for a three car garage; add nothing if garage is firewalled) |
Sub-Total (1) |
=
|
____ sqft
|
|
|
account for multi-story home
(skip ahead if single story) |
x |
____ |
|
(ex. multiply by 0.50 for full two-story home; multiply by 0.75 for 1½ story home) |
Sub-Total (2) |
=
|
____ sqft
|
|
|
account for dark colored roof (skip ahead if light colored roof) |
x |
____ |
|
(ex. multiply by 1.15 for roofs with dark colored shingles or tiles - black; charcoal; dark brown) |
Sub-Total (3) |
=
|
____ sqft
|
|
|
account for large air volume attics (skip ahead for typical size attics) |
x |
____ |
|
(ex. multiply by 1.20 for attics with larger than typical air volume - typical attic:
|
Calculated Cooling Area
|
=
|
____ sqft
|
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Calculated Cooling Area |
Roof Mounted Solar Attic Fans |
Gable Mounted Solar Attic Fans |
20 watt |
25 watt |
20 watt |
25 watt |
< 1600 sq ft |
1x |
|
1x |
|
1600 - 1850 sq ft |
1x |
|
|
1x |
1850 - 2050 sq ft |
|
1x |
|
1x |
2050 - 2300 sq ft |
|
1x |
2x |
|
2300 - 3050 sq ft |
2x |
|
2x |
|
3050 - 3500 sq ft |
2x |
|
|
2x |
3500 - 3900 sq ft |
|
2x |
|
2x |
3900 - 4300 sq ft |
|
2x |
3x |
|
4300 - 4550 sq ft |
3x |
|
3x |
|
4550 - 5200 sq ft |
3x |
|
|
3x |
5200 - 5800 sq ft |
|
3x |
|
3x |
5800 - 6400 sq ft |
|
3x |
4x |
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Commercial model sizing will be added soon...
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  800 333 9276 |
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