The 24 inch Aura Gravity Retrofit Vent is designed to replace existing attic vents. The AV-24-RF is 24 inches in diameter and has 452 inches of Net Free Area (NFA). This roof vent will fit over an existing base of the same diameter. It is a perfect replacement for turbine vent heads. Turbine vents frequently stop turning entirely due to corrosion. However, our Gravity Retrofits are made from durable rust free aluminum.
The Aura Gravity Retrofits are designed to fit over an existing base of the same diameter. This allows for easy installation without damaging the roofing material. The vent removes heat from the attic in the summer and moisture in the winter allowing for proper ventilation. This retrofit comes in an array of sizes to fit all roofing needs.
The Aura Gravity Ventilator works like a roof turbine but with no moving parts.
The 1/8 inch louvers are designed to prevent rain, snow, insects and animals from entering inside the vent.
Aura Gravity Ventilators rely on the Venturi Effect when wind blows against the outer louvers. As a result, this creates an upward draft allowing air to freely flow in and out of the vent.
Even the smallest breeze can create exhaust ventilation so that air is drawn out of the gravity vent. This movement of air is proportional to the wind speed and is measured in cubic feet per minute (CFM) In addition, the round design is aerodynamic to withstand wind speeds up to 200 mph. This is much more efficient compared to a typical wind turbine vent, which is open to the sky; Thus allowing rain and snow to get inside when it is not in motion.
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.