The Miami-Dade County Approved Round Back Static Vent is one of the smallest roof vents AVP uses for steep slope roof ventilation; however, it is also one of the most popular roof vents AVP manufacturers. Don’t let the compact size fool you; this static vent is a great choice for ventilating attic spaces. When installed near the peak of the roof, this static vent will exhaust hot air from the attic in the summer and moisture from the attic air in the winter.
The 1/8 inch louvers are designed to prevent rain, snow, insects, and animals from entering inside the vent.
Proper roof ventilation is important all year long. Everyone knows that static roof vents lower attic temperatures in the summer, but they also help to prevent ice damming from occurring during the winter. Made of rust-free aluminum, the Round Back Static Vent will help to maintain the beauty of your roof for many years to come.
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, we also have Static Vents with curb mount flanges to be installed on roof curbs.
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 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.
 Diameter | NFA Net Free Area in Sq. In. | IBC 1/300 |  2" Tall Collar |  4" Tall Collar |
|---|---|---|---|---|
| 3" | 7 | 29 | RBV-3-C2 | RBV-3-C4 |
| 4" | 12 | 50 | RBV-4-C2 | RBV-4-C4 |
| 5" | 19 | 79 | RBV-5-C2 | RBV-5-C4 |
| 6" | 28 | 116 | RBV-6-C2 | RBV-6-C4 |
| 7" | 38 | 158 | RBV-7-C2 | RBV-7-C4 |
| 8" | 50 | 208 | RBV-8-C2 | RBV-8-C4 |
| 9" | 60 | 262 | RBV-9-C2 | RBV-9-C4 |
| 10" | 78 | 325 | RBV-10-C2 | RBV-10-C4 |
| 12" | 113 | 470 | RBV-12-C2 | RBV-12-C4 |
AVP’s Round Back Static 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.
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, pulldown to select the specific vent diameter to show the number of vents of that size which would ventilate the specified area with both 1/300 and 1/150 rule.
*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.
Our Round Back 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.
