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AV-42-RF | Aura Vent Retrofit 42″ Diameter


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Brand: Active VentilationUPC(GTIN): 843951001319 SKU: AV-42-RF Category:

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Retrofit Aura Vent Cap AV-42-RF-cut-away-and-measurements

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:

48 in.
106.7 cm.

Outside Diameter:

48 in.
121.9 cm.

Retrofit Stop Rib:

5.1 cm.

Height of Head:

18 in.
45.7 cm.

Diameter of Retrofit Opening:

Total Height of Retrofit Vent:

20 in.
50.8 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):

14.5 in.
36.8 cm.

Louver Height (outside):

14.5 in.
36.8 cm.

Size of opening btwn blades (inside):

0.5 in.
1.3 cm.

Size of opening btwn blades (outside):

0.5 in.
1.3 cm.

Free Air Space:

1385.4 sq. in.
8938.3 sq. cm.

Free Air Space:

9.62 sq. ft.
0.894 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:

1883 CFM
Airflow in 6.4 KPH Wind: 53.32 CMM

5.2 MPH Wind:

1931 CFM
Airflow in 8.4 KPH Wind: 54.68 CMM

7.4 MPH Wind:

2960 CFM
Airflow in 11.9 KPH Wind: 83.82 CMM

9.8 MPH Wind:

3331 CFM
Airflow in 15.8 KPH Wind8: 94.32 CMM

11 MPH Wind:

4997 CFM
Airflow in 17.7 KPH Wind8: 141.5 CMM
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42 inches in diameter for an existing turbine base or vent pipe


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