Keepa Vents remove heat and moisture from the attic extending roof membrane life
The Keepa Attic Vent is built for Flat Roof Ventilation. Flat roof ventilation is a roof pitch that is 2/12 or less. This attic vent removes excess moisture from the attic during the winter and heat during the summer. As a result, this will extend the life of the roof membrane. The Keepa Attic Vent can be used as a two-way vent. In other words, this vent can be used an exhaust vent or as an intake vent for ventilating attics and or plenums. It comes with a standard flat flange that can be mounted directly on to the roof. However, it can be made with a curb mount flange in order for it to be installed onto a roof curb. Keepa Attic Vents can also be manufactured with tailpipe adapters if the vent is needed to connect to duct work.
The Keepa Attic Vent has an aerodynamic round design that is available in diameters 3 to 12 inches. 3 inch attic vents come with a 7 inch tall collar while sizes 4" though 12" diameters come with an 11 inch tall collar. The 11 inch collars are rated for all climate zones.
In addition, the round design is aerodynamic to withstand wind speeds up to 200 mph.
Net Free Area
in Sq. In.
|Inside Diameter||Outside Diameter||Standard Height||Collar Height|
All attic vents are made of durable rust free aluminum. The Keepa’s round cap is removable for an easy installation of the base on to a membrane roof.
The Keepa Vent has proven to be an outstanding and affordable choice for flat roof ventilation.
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.
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.