Aura Roof Exhaust Fan with Curb Mount Flange | CFM: 2200 18″ Diameter 12″ Tall Collar | Model AF-18-C12-CMF


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18 Inch Aura Attic Fan with Curb Mount Flange | AF-18-C12-CMF | 2,200 CFM

The 18 inch Aura Attic Fan with Curb Mount Flange is 18 inches in diameter and has a 12 inch tall collar. The model number is AF-18-C12-CMF and exhausts air out at 2,200 CFM. All 18 inch gravity fans come with a standard 22″ x 22″ flange to fit over roof curbs.

Installation: For low slope or flat roof ventilation

The Aura Gravity Fan exhausts air continuously even when the motor is off. This attic fan works passively because of the Venturi Effect. When the wind blows against the outer louvers this creates an upward draft which allows air to freely flow in and out of the vent. This Attic Fan is also available with an optional Shut-Off Switch, Thermostat and Humidistat (THSOS).

The curb mount flange allows for easy installation on roof curbs of the same diameter. In addition, the curbed flange can be used as a hatch to access the ductwork below. We recommend installation on roofs with a pitch of 2/12 or less.

Motor Type:  Totally Enclosed

With 1/2 horsepower and 2,200 CFM, this 18 inch vent is perfect for ventilating large attic spaces or plenums.

How it works:

Even when the motor is off, the attic fan will still ventilate passively. In other words, even the smallest breeze can create exhaust ventilation to draw air out of the fan.

This movement of air is proportional to the wind speed and is measured in cubic feet per minute (CFM). Therefore, wind speeds of 11 mph for an 18 inch attic fan produces 634 CFM of air exhaust for attic ventilation.

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

Color Chart
A Roof Curb below would fit this 18 inch diameter product

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  • Roof Curb - 18

    Roof Curb (fits 18″ Vent or Fan with CMF) | Model RC-18-H12

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  • Roof Curb

    Roof Curb (fits 18″ Vent or Fan with CMF) | Model RC-18-H6

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Base Price (Not Including Shipping and Options):


Shut-off Switch Options:
SOS - Simple Shut-Off Switch
THSOS - Temperature and Humidity Sensor 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): 843951001449 Model AF-18-C12-CMF Category:
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