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ASF-20-C08 | Aura Solar Fan 20″ Diameter 8″ Collar


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  • Optional Fan Controls

    • 20 $
    • 60 $
  • An Additional Solar Panel is optional with all solar fans. 

    • 300 $

    We need to know the type of roof (Flat or Pitched) to supply the correct brackets. 

    • $
    • $
  • All our aluminum products can be painted with a durable baked-on powder coating surface finish.

    • 0 $
    • 40 $
    • 80 $

    Hover (or tap once) to show color with name, Click (or tap again) to select.

    Hover (or tap once) to show color with name, Click (or tap again) to select.

SKU: ASF-20-C08 Category:
Solar Attic Fan - Aura Solar Fan ASF-20-C8-side-1
Solar Attic Fan - Aura Solar Fan ASF-20-C8-side-2

Shipping Dimensions for ASF-20-C08

Package Weight 25 lbs
Dimensions 26 × 26 × 26 in
Billable Weight 127 lbs

Active Ventilation Products

Basic dimensions of the Aura Solar Fan and it’s identifying attributes. Primary identifying dimensions of vents and fans are the inside diameter of the Head, which equals the diameter of the hole being vented, and the height of the Collar which is the solid tube between the Head of the vent and the Flange which attaches to the roof.

Inside Diameter:

20 in.
50.8 cm.

Outside Diameter:

25 in.
63.5 cm.

Square Flange (side length):

26 in.
66 cm.

Height of Head:

9 in.
22.9 cm.

Collar Height:

8 in.
20.3 cm.

Height of Flange:

0 in.
0 cm.

Total Height with Collar and Flange:

18.25 in.
46.4 cm.

Louvers are the vertical openings in the vent, which facilitates the flow of air, while keeping animals, insects, debris, and embers out.  The combination of inner and outer Louvers on our patented “Aura” series of vents and fans are shaped to create a positive vacuum effect which draws air out of the vent, utilizing a physical principle known as the Venturi effect.

Louver Height (inside):

6.25 in.
15.9 cm.

Louver Height (outside):

6.25 in.
15.9 cm.

Size of opening btwn blades (inside):

0.125 in.
0.3 cm.

Size of opening btwn blades (outside):

0.25 in.
0.6 cm.

Expected snow and rain in your region and the pitch of the roof are the key consideration when choosing the height of the collar of your roof vents. Zones 1 and 2 are not expected to sustain significant snow packs, while zones 3-7 are likely to experience snow, possibly for weeks or months. Vent collars under 4 inches are inappropriate for flat (0/12 pitch) roofs because even heavy rain can splash water into a shorter vent.

Map of Climate Zones

Minimum Pitch Capacity:


Maximum Pitch Capacity (Standard Vent):


Maximum Pitch Capacity (Modified):


Free Air Space:

314.2 sq. in.
2026.8 sq. cm.

Free Air Space:

2.18 sq. ft.
0.203 sq. m.

1:150 Ventilation Rule:

654.5 sq. ft.
60.8 sq. m.

1:300 Ventilation Rule:

1309 sq. ft.
121.6 sq. m.

The Venturi effect stimulated by even small breezes creates a positive movement of air out of the vent without the need of any part of the vent to move. This movement of air is proportional to the wind speed, and can be measured in Cubic Feet per Minute or Cubic Meters per Minute.

4 MPH Wind:

436 CFM
Airflow in 6.4 KPH Wind: 12.35 CMM

5.2 MPH Wind:

462 CFM
Airflow in 8.4 KPH Wind: 13.08 CMM

7.4 MPH Wind:

685 CFM
Airflow in 11.9 KPH Wind: 19.4 CMM

9.8 MPH Wind:

771 CFM
Airflow in 15.8 KPH Wind8: 21.83 CMM

11 MPH Wind:

881 CFM
Airflow in 17.7 KPH Wind8: 24.95 CMM

Solar Fan Total Wattage:

41.28 Watts

Fan Count:


Solar Power Air Flow:

849 CFM
24.04 CMM

Total Air Flow @0.1SP:

2029 CFM
57.46 CMM

Fan Dimensions:

4.7in. x 4.7 in. x 1 in.
120mm. x 120 mm. x 25 mm.

Bearing Type:

Ball Bearing

Fan Speed (RPM):

2200 RPM

Noise Levels (Decibels):

25 dBa

Rated Voltage:

12V DC

Rated Current (Amps):


Power Consumption (Watts):


Life Hours:


Installation Guides Under Development. Coming Soon.


Aura Solar Fan, 20″ Diameter, 8″ Collar, and Square Flange


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