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Roof Vents, Attic Fans & Roof Vent Accessories

AF-20-C12-CMF | Aura Fan Curb Mount Flange 20″ Diameter 12″ Collar

$666.00

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Gravity Ventilator - Aura Vent With Curb Mount Flange AV-20-C12-CMF-3
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  • Shut Off Switch options

    Optional Fan Controls

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Brand: Active VentilationUPC(GTIN): 843951001517 SKU: AF-20-C12-CMF Category:
Products with Related Sizes and Features to AF‑20‑C12‑CMF Larger Diameter: AF‑24‑C12‑CMF$770AF-24-C12-CMF | Aura Fan Curb Mount Flange 24″ Diameter 12″ CollarSmaller Diameter: AF‑18‑C12‑CMF$593AF-18-C12-CMF | Aura Fan Curb Mount Flange 18″ Diameter 12″ CollarShorter Collar: AF‑20‑C08‑CMF$661AF-20-C08-CMF | Aura Fan Curb Mount Flange 20″ Diameter 8″ Collar
Categories and Pages Related to AF‑20‑C12‑CMF Exhaust Attic Fans Roof CurbsReturn/Cancellation Policy WarrantiesShipping/Delivery Policies
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Gravity Ventilator - Aura Vent with Curb Mount Flange AV-20-C12-CMF-2
Gravity Ventilator - Aura Vent with Curb Mount Flange AV-20-C12-CMF-8
Gravity Ventilator - Aura Vent with Curb Mount Flange AV-20-C12-CMF-3
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Shipping Dimensions for AF-20-C12-CMF

Manufacturer

Active Ventilation Products

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Installation Guides Under Development. Coming Soon.

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Roof Curb Product Page

Dimensions

Basic dimensions of the Aura 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):

24 in.
61 cm.

Height of Head:

9 in.
22.9 cm.

Collar Height:

12 in.
30.5 cm.

Height of Flange:

2 in.
5.1 cm.

Total Height with Collar and Flange:

23 in.
58.4 cm.

Louvers

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.
15.875 cm.

Louver Height (outside):

6.25 in.
15.875 cm.

Size of opening btwn blades (inside):

0.125 in.
0.3175 cm.

Size of opening btwn blades (outside):

0.25 in.
0.635 cm.

Roof Pitch

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:

0/12

Maximum Pitch Capacity (Standard Vent):

0/12

Maximum Pitch Capacity (Modified):

12/12

Air Flow

Free Air Space:

314.2 sq. in.

Free Air Space:

2.182 sq. in.

1:150 Ventilation Rule:

654.5 sq. in.

1:300 Ventilation Rule:

1309 sq. in.

When the Fan is OFF, the Venturi effect is 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

Fan and Motor

AC Motor Horsepower:

3/4 hp

Max Amps:

10.5 A

Motor Type:

PSC - Open Ventilation

Airflow With Fan:

3300 CFM
93.4 CMM

Fan Blade Count:

4 Blades

Fan Blade Diameter:

18 in.
45.72 cm.

Description

The Aura Fan EXHAUSTS CONTINUOUSLY whether the electric motor is ON or OFF. When the fan is off, outside air moving against the Aura Ventilator causes the Venturi effect, thereby creating an exhaust. The exhaust is created without the use of electricity or moving parts. On the days when the fan is not needed, the Aura Vent will still operate passively; this increases the life of the motor since it is not in constant use. The Aura Fan Ventilator reduces energy consumption.

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