Round Back Static Vent with Curb Mount Flange | 12″ Diameter 2″ Tall Collar | 113 Sq. In. NFA | Model RBV-12-C2-CMF


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Round Back Static Vent with Curb Mount Flange | RBV-12-C2-CMF

The 12 inch Round Back Static Vent with Curb Mount Flange is 12 inches in diameter with a 2 inch tall collar. In other words, this vent has 2 inches of clearance between the base and the inner louvers. The model RBV-12-C2-CMF has 113 inches of net free area (NFA) and comes with a 14” x 14” square curb mount flange.

Installation: The Curb Mount Flange will only fit over a Roof Curb of the same diameter.

This Static Vent removes hot air in the summer and moisture from the attic in the winter for year-round ventilation. Because of the curb mount flange, this vent is for installation on top of a roof curb. In other words, this flange will only fit over roof curbs or an existing base of the same diameter. This allows for easy access to the attic or duct below.

To determine the number of vents you may need, see our Vent Calculator.

How it works:

This static vent is ideal for venting out bathroom fans or range hoods. In addition, the round design is aerodynamic to withstand wind speeds up to 200 mph. The 6 inch Round Back Vent is great for residential roof applications because of its low profile. It can also be painted to match the color of the asphalt shingles.

AVP's Round Back Vents have the power to withstand hurricane-force winds. See some of our customer feedback. However, if you are looking to ventilate a duct, please see our Round Back Roof Jack for vents with a tailpipe adapter. On the other hand, AVP also offers Static Vents with flat flanges to be installed on roofs with a pitch of 3/12 or greater.

For any questions please see the frequently asked questions page. If you still have questions, email the sales team at [email protected] or call 845-565-7770

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Click below to see or download full Installation Instructions for this product

Installation Instructions

Calculate number of Model RBV-12-C2-CMF Vents Needed for a Given Area

Enter the Width and Length of the attic space you need to ventilate to calculate the area. You may also enter the area directly in the "Area" field. It is not necessary to hit the Return or Enter key (which will refresh this page), just enter numbers in the fields.

Enter width of space to calculate area (or enter Area below)

Enter width of space to calculate area (or enter Area below)

If you know it, you may enter the area directly here

The diameter size of all roof vents determines the Net Free Area, also known as the "NFA". NFA is the measured amount of opening each vent offers at each specific size. to be available for venting air through a specific vent size. The calculator below will find the overall number of vents needed to effectively ventilate the targeted attic space.

Once you have the area, the numbers shown below are the number of vents of that size which would ventilate the specified area with both 1/300 and 1/150 rule.

Results Appear Here

*Please note
The roof vent calculation values shown above are for the exhaust portion of the roof. The same amount of net free air inches is needed for air intake as well. Proper roof ventilation consists of 50% air exhaust and 50% air intake.

A Roof Curb below would fit this 12 inch diameter product

Showing all 2 results

  • Roof Curb

    Roof Curb (fits 12″ Vent or Fan with CMF) | Model RC-12-H6

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  • RC-12-H12 Roof Curb

    Roof Curb (fits 12″ Vent or Fan with CMF) | Model RC-12-H12

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Base Price (Not Including Shipping and Options):


Our products can be painted with a durable baked-on powder coating surface finish.
Click in a color square to choose a paint color.
Click "Premium Colors" to see the full set of color options.

Brand: Active VentilationUPC(GTIN): 843951009308 Model RBV-12-C2-CMF Category:
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