Aura Solar Attic Fan | CFM: 1740 18″ Diameter 4″ Tall Collar | Model ASF-18-C4


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18 inch Aura Solar Attic Fan | Model ASF-18-C4 | 1,375 CFM

The 18 inch Aura Solar Attic Fan is 18 inches in diameter and has a 4 inch tall collar. The model ASF-18-C4 exhausts air out at 1,740 CFM. All 18 inch solar gravity fans come with a standard 23″ x 23″ square flange.


  • Keeps your home comfortable and energy efficient
  • Works passively with the wind when there is no sunlight
  • Inner louvers prevent insects and animals from entering the vent
  • Round aerodynamic design can withstand harsh weather


If installed no more than 3 feet from the peak, this fan can go on a roof with a pitch of 3/12 to 5/12. However, with modification, this fan is capable of installment on a 12/12 pitch in all climate zones.

The Aura Solar Fan is ideal for ventilating steep slope roofs. It will remove heat during the summer and moisture during the winter to provide ventilation all year. Keeping the attic dry and cool during the winter will preserve attic insulation and prevent ice dams.

18 inch diameter fans are considered a commercial size and therefore should be used in commercial settings. For those looking to ventilate their homes, please view roof vents with a smaller diameter.

How it works:

The Aura Solar Fan uses both solar and wind to power the ventilator. Fan only works with solar power when in bright, direct sunlight on South facing roofs.

However, it exhausts air continuously even without the sun. It works passively due to the Venturi Effect. When the wind blows against the outer louvers this creates a vortex of air within the head. As a result, creating an upward draft which allows air to flow out of the vent.

The 1/8 inch louvers prevent rain, snow, insects, and animals from entering inside the fan.

For any questions please see the frequently asked questions page. If you still have questions, email the sales team at [email protected] or call 845-565-7770

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Base Price (Not Including Shipping and Options):


Tandem Solar Panel Options:
An additional solar panel is available for all solar fans

Shut-off Switch Options:
SOS - Simple Shut-Off Switch
TSOS - Temperature Sensor Shut-off Switch

Our products can be painted with a durable baked-on powder coating surface finish.
Click in a color square to choose a paint color.
Click "Premium Colors" to see the full set of color options.

Brand: Active VentilationUPC(GTIN): 843951005454 SKU: ASF-18-C4 Category:
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