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Aura Gravity Ventilator | 12″ Diameter 2″ Tall Collar AV-12-C02


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Brand: Active VentilationUPC(GTIN): 843951000619 SKU: AV-12-C02 Category:
Gravity Ventilator - Aura Ventilator AV-12-C2-angle
Gravity Ventilator - Aura Ventilator AV-12-C2-Far
Gravity Ventilator - Aura Ventilator AV-12-C2-brown
Gravity Ventilator - Aura Ventilator HD-AV-12-C2-BL2
Gravity Ventilator - Aura Ventilator HD-AV-12-C2-BR
Gravity Ventilator - Aura Ventilator HD-AV-12-C2-WD
Gravity Ventilator - Aura Ventilator HD-AV-12-C2-WT

Click the Logo to see the full documentation of Active Ventilation Products approvals on the Florida DBPR web site.
Florida Approval

Active Ventilation Products Aura Vent series has been tested and approved by the State of Florida

Texas Department of Insurance - Letterhead

Link to TDI Approval Document, from their web site

Texas Department of Insurance - Evaluation Program

Texas Department of Insurance - Aura Vent Chart

Click to download or print Placement Instruction pdf

Shipping Dimensions for AV-12-C02

Actual Package Weight 6 lbs
Dimensions 18 × 18 × 10 in
UPS Dimensional (Billable) Weight 24 lbs

Active Ventilation Products

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Click to enlarge pdf below for print

Basic dimensions of the Aura Vent 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:

12 in.
30.5 cm.

Outside Diameter:

16 in.
40.6 cm.

Square Flange (side length):

18 in.
45.7 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 in.
20.3 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 signature “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.
0.3175 cm.

Size of opening btwn blades (outside):

0.25 in.
0.635 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:

3/12 - 14°

Maximum Pitch Capacity (Standard Vent):

7/12 - 30.3°

Maximum Pitch Capacity (Modified):

12/12 - 45°

Free Air Space:

113.1 sq. in.
729.7 sq. cm.

Free Air Space:

0.7854 sq. ft.
0.073 sq. m.

1:150 Ventilation Rule:

235.62 sq. ft.
21.89 sq. m.

1:300 Ventilation Rule:

471.24 sq. ft.
43.78 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:

120 CFM
Airflow in 6.4 KPH Wind: 3.4 CMM

5.2 MPH Wind:

135 CFM
Airflow in 8.4 KPH Wind: 3.82 CMM

7.4 MPH Wind:

227 CFM
Airflow in 11.9 KPH Wind: 6.43 CMM

9.8 MPH Wind:

270 CFM
Airflow in 15.8 KPH Wind8: 7.65 CMM

11 MPH Wind:

310 CFM
Airflow in 17.7 KPH Wind8: 8.78 CMM
Click to enlarge pdf for print

Our Aura Vents have UL Certification. Check out other details and specifics on

UL Product IQ™ (Note: UL now requires you to have a free account to access this page)
UL’s Online Certifications Directory.


Active Ventilation Products Aura Ventilator is our optimum exhaust attic ventilation product line that has a patented engineered design to create CFM (Cubic Feet per Minute) of air flow with no moving parts. It is an excellent choice to exhaust attic heat in the summer to reduce hot attic temperatures. And, to exhaust moisture in the winter to keep the attic dry and cool to preserve attic insulation and prevent ice dams. The Aura Ventilation product line is made of durable rust free aluminum. Model AV-12-C2 is made up of 3 components: the vent head, collar and flange. Model AV-12-C2 is a 12 in. Dia. vent with a 2 in. collar height and 18 in. x 18 in. sq. flange. It has 113 sq. in. of Net Free Air Space. Its low profile is best used for a sloped roof. When air moves against the louvers of the outer cylinder it is directed to create a circular airflow. The louvers of the inner cylinder face in the same direction as the air movement created by the outside cylinder. This air movement creates a venturi effect which produces a vacuum or negative pressure to pull air from within the attic space. The vent head has a flat one piece spun lid that prevents rain and snow from entering the vent verses the turbine vent which is open to the sky and allows rain water to enter in no wind conditions. 5 year warranty.

  • Inner vertical louvers keeps insects, birds and squirrels from entering the vent allowing optimal air flow and no maintenance
  • Use on pitched roofs ranging between 3/12 and 12/12
  • Round aerodynamic design can with stand harsh weather and wind forces of up to 200 mph
  • Mill finish aluminum color that will continually have a long lasting clean appearance
  • Vent head is removable for easy installation
  • Noiseless – does not require electricity to exhaust air from attics spaces
  • Ventilation rule 1:300 (1 per sq. ft. of attic space): 450 sq. ft. for exhaust
  • Helps to reduce energy costs