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Aura Solar Attic Fan | CFM: 91 4″ Diameter 2″ Tall Collar ASF-04-C02


  • Optional Fan Controls

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

    • 25 $

    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 $
    • 6 $
    • 12 $

    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.

Brand: Active VentilationUPC(GTIN): 843951005287 SKU: ASF-04-C02 Category:
Solar Attic Fan - Aura Solar Fan ASF-4-C2-Top-2
Solar Attic Fan - Aura Solar Fan ASF-04-C02

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:

4 in.
10.2 cm.

Outside Diameter:

7 in.
17.8 cm.

Square Flange (side length):

10 in.
25.4 cm.

Height of Head:

6 in.
15.2 cm.

Collar Height:

2 in.
5.1 cm.

Height of Flange:

0 in.
0 cm.

Total Height with Collar and Flange:

8.75 in.
22.2 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):

4 in.
10.2 cm.

Louver Height (outside):

4 in.
10.2 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):


Total CFM:

91 CFM

Free Air Space:

12.6 sq. in.
81.1 sq. cm.

Free Air Space:

0.09 sq. ft.
0.008 sq. m.

1:150 Ventilation Rule:

26.2 sq. ft.
2.4 sq. m.

1:300 Ventilation Rule:

52.4 sq. ft.
4.9 sq. m.

Solar Fan Total Wattage:

3 Watts

Fan Count:


Solar Power Air Flow:

25 CFM
0.71 CMM

Total Air Flow @0.1SP:

91 CFM
2.58 CMM

Fan Dimensions:

2.4in. x 2.4 in. x 1 in.
60mm. x 60 mm. x 25 mm.

Bearing Type:

Ball Bearing

Fan Speed (RPM):

4000 RPM

Noise Levels (Decibels):

32 dBa

Rated Voltage:

12V DC

Rated Current (Amps):


Power Consumption (Watts):


Life Hours:


Installation Guides Under Development. Coming Soon.

The Aura Solar Attic Fan uses both solar and wind power for optimum ventilation performance, day and night.
The solar panel wattage is over-sized to the fans at a rate of 2 to 1. This results in Cubic Feet per Minute (CFM) production at angles up to 80 degrees. Even during evenings and cloudy days when the solar panel is not hit by sunlight, the inner and outer vertical louvers around the fan allow air to exhaust passively.

  • Aura Solar Fan, Model ASF-4-C02, 3 watt, 25 CFM, 4″ Diameter Solar Powered Roof Mounted Attic Fan with an 2″ Collar Height and Square Flange

When the hot air from the inside and the fresh air from the outside pass through, a vacuum is created. This further exhausts the attic space without the need for moving parts. As a result, attic temperatures are lowered and air conditioning loads are reduced both day and night. The inner louver design of the vent also prevents rain and snow from entering. Compare this to turbine vents, which are open to the sky and let in rain when not in motion. The louvers keep out insects and animals as well. This works more effectively than an insect screen, which tends to clog up and reduce air flow.

  • Quiet operation
  • All aluminum construction
  • Optional thermostat/cut-off switch available
  • Optional auxiliary solar panel also available
Actual Package Weight 3 lbs
Dimensions 10 × 10 × 12 in
UPS Dimensional (Billable) Weight 9 lbs

Active Ventilation Products

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