The 18 inch Pop Vent Air Intake Vent with Curb Mount Flange is ideal for maintaining proper rooftop ventilation. The PV-18-C4-CMF is 18 inches in diameter with a 4 inch tall collar. In other words, this vent has 4 inches of clearance between the base and the inner louvers.
In addition, the 18 inch Pop Vent has 254 inches of Net Free Area (NFA) and a standard 22” x 22” curb mount flange.
18 inch diameter roof vents are commercial size, therefore, they are ideal for commercial settings. For those looking to ventilate their homes, please view roof vents with a smaller diameter.
This 18 inch attic vent is suitable for installation in all climate zones if installed on a roof curb. We offer roof curbs to ensure that your vent will fit over the curb seamlessly.
Because of the Curb Mount Flange, this vent can be used as a hatch to access the ductwork or attic below without damaging the roof. To determine the number of vents you may need for proper attic ventilation, see our Vent Calculator.
The Air Intake Roof Louver provides fresh air into the attic or plenum. Without proper rooftop ventilation, heat and moisture can cause decay of the structure. This roof vent also helps to keep insulation dry in the winter to prevent the growth of mold.
Additionally, the round design is aerodynamic to withstand wind speeds up to 200 mph. The 18 inch Pop 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.
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.
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.