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Aura Gravity Ventilator | 8″ Diameter 2″ Tall Collar AV-08-C02


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Gravity Ventilator - Aura Ventilator AV-8-C2-angle
Gravity Ventilator - Aura Ventilator AV-8-C2-side

Aura Vent - Technical Drawing Downloads

Product LinkDrawing- Unmarked
Drawing- Measurements
Drawing- Cutaway
AV-08-C02dwg 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:

8 in.
20.3 cm.

Outside Diameter:

11 in.
27.9 cm.

Square Flange (side length):

14 in.
35.6 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:


Maximum Pitch Capacity (Standard Vent):


Maximum Pitch Capacity (Modified):


Free Air Space:

50.3 sq. in.
324.3 sq. cm.

Free Air Space:

0.3491 sq. ft.
0.0324 sq. m.

1:150 Ventilation Rule:

104.72 sq. ft.
9.729 sq. m.

1:300 Ventilation Rule:

209.44 sq. ft.
19.458 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:

80 CFM
Airflow in 6.4 KPH Wind: 2.27 CMM

5.2 MPH Wind:

98 CFM
Airflow in 8.4 KPH Wind: 2.78 CMM

7.4 MPH Wind:

145 CFM
Airflow in 11.9 KPH Wind: 4.11 CMM

9.8 MPH Wind:

165 CFM
Airflow in 15.8 KPH Wind8: 4.67 CMM

11 MPH Wind:

185 CFM
Airflow in 17.7 KPH Wind8: 5.24 CMM

Aura Roof Vent - Installation Instructions

Product LinkInstallation Instructions - Shingled Roof - pdfInstallation Instructions- Flat Roof - pdf
AV-08-C02pdf file icon - click to download pdf fileN/A

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

This particular Aura Gravity Ventilator is 8 inches in diameter and has a 2 inch tall collar or neck. Model number is AV-08-C02 and has 50 inches of net free area (NFA). All 8 inch gravity ventilators come with a standard 13″ x 13″ square flange flashing.

If installed on the upper portion (no more than 2 feet down from the peak) of the roof, this product can go on a 3/12 to 7/12 pitched roof. For roofs that are pitched at 8/12 or greater, please notify the sales department when ordering your roof vents. Vents can be modified to operate up to a 12/12 pitch.

The Aura Gravity Ventilator works like a roof turbine but with no moving parts.

Aura Gravity ventilators rely on the Venturi Effect (the creation of an upward draft) when wind blows against the outer louvers.

Even the smallest breeze can create exhaust ventilation so that air is drawn out of the gravity vent. This movement of air is proportional to the wind speed, and is measured in cubic feet per minute (CFM). Wind speeds of 11 mph for a 4 inch Aura Gravity Ventilator, produces 185 cfm of air exhaust for attic ventilation.

Aura Gravity Vents are UL Listed and rated up to 50+ PSF or wind pressure above 200 MPH.  Certified by Texas Department of Insurance, Florida State Approved & Conforms to the Standards of CALFIRE.

Actual Package Weight 4 lbs
Dimensions 14 × 14 × 10 in
UPS Dimensional (Billable) Weight 15 lbs

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