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Aura Gravity Ventilator | 36″ Diameter 8″ Tall Collar AV-36-C08


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Gravity Ventilator - Aura Ventilator AV-36-C08-with-measurements
Gravity Ventilator - Aura Ventilator AV-36-C08-unmarked-drawing
Gravity Ventilator - Aura Ventilator AV-36-C08-CMF
Gravity Ventilator - Aura Ventilator AV-36-C08-CMF-LOUVERS

Aura Vent - Technical Drawing Downloads

Product LinkDrawing- Unmarked
Drawing- Measurements
Drawing- Cutaway
AV-36-C08dwg file icon - click to download CAD (dwg) filepdf file icon - click to download pdf filedwg file icon - click to download CAD (dwg) filepdf file icon - click to download pdf filedwg file icon - click to download CAD (dwg) filepdf file icon - click to download pdf file

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:

36 in.
91.4 cm.

Outside Diameter:

42 in.
106.7 cm.

Square Flange (side length):

46 in.
116.8 cm.

Height of Head:

14 in.
35.6 cm.

Collar Height:

8 in.
20.3 cm.

Height of Flange:

0 in.
0 cm.

Total Height with Collar and Flange:

22 in.
55.9 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):

10.5 in.
26.7 cm.

Louver Height (outside):

10.5 in.
26.7 cm.

Size of opening btwn blades (inside):

0.5 in.
1.27 cm.

Size of opening btwn blades (outside):

0.5 in.
1.27 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:

0/12 - 0°

Maximum Pitch Capacity (Standard Vent):

3/12 - 14°

Maximum Pitch Capacity (Modified):

12/12 - 45°

Free Air Space:

1385.4 sq. in.
8938.3 sq. cm.

Free Air Space:

9.6211 sq. ft.
0.8938 sq. m.

1:150 Ventilation Rule:

2886.34 sq. ft.
268.15 sq. m.

1:300 Ventilation Rule:

5772.68 sq. ft.
536.299 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:

1256 CFM
Airflow in 6.4 KPH Wind: 35.57 CMM

5.2 MPH Wind:

1287 CFM
Airflow in 8.4 KPH Wind: 36.44 CMM

7.4 MPH Wind:

1973 CFM
Airflow in 11.9 KPH Wind: 55.87 CMM

9.8 MPH Wind:

2221 CFM
Airflow in 15.8 KPH Wind8: 62.89 CMM

11 MPH Wind:

2538 CFM
Airflow in 17.7 KPH Wind8: 71.87 CMM

Aura Roof Vent - Installation Instructions

Product LinkInstallation Instructions - Shingled Roof - pdfInstallation Instructions- Flat Roof - pdf
AV-36-C08N/Apdf file icon - click to download pdf file

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 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

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.
UL Certificate of Compliance - Aura Vent

Aura Roof Ventilator 36″ diameter Aluminum Gravity Vent with a 8″ collar height and 46″ x 46″ square flange.
Model AV-36-C08 has 1,017 square inches of Net Free Air Space.
Best used on sloped pitch roof applications.

Actual Package Weight 66 lbs
Dimensions 46 × 46 × 24 in
UPS Dimensional (Billable) Weight 366 lbs

Active Ventilation Products

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