The Aura Gravity Vent is for replacing old roof turbines. The Aura Vent is made of aluminum therefore it will not rust over time. It also does not spin in order to create ventilation. The Aura Vent relies on the Venturi Effect. This occurs when wind blows against the outer louvers creating a vortex within the head. This will draw air up and out of the vent. The gravity ventilator also ventilates the roof through “The Stack Effect”. This is when hot air naturally rises out through the roof vents.
Old roof turbines spin in order to prevent rain from getting inside. AVP’s vents have a double louver design pressed together that is cut to 1/8 inch. This allows for optimal airflow while preventing rain, snow and wildlife from entering inside.
The Aura Gravity Ventilator removes heat from the attic in the summer and moisture in the winter. This allows for year-round ventilation. This air movement is proportional to the wind speed and measured in cubic feet per minute (CFM).
The Collar Height is the height of the neck of the vent.
Net Free Area
2" Tall Collar
4" Tall Collar
6" Tall Collar
8" Tall Collar
12" Tall Collar
The Gravity Ventilators come in an array of diameters and collar heights allowing for installation in any climate zone. See the Climate Zone Chart to determine the proper collar height for installation in your area. In other words, this vent can be used for both flat and steep sloped roofs. It has also been engineered to be used for both residential and commercial buildings. However, if you are looking to ventilate a duct, AVP offers roof vents with a tailpipe adapter. On the other hand, AVP also has Static Vents with curb mount flanges to be installed on roof curbs.
For any questions please see the frequently asked questions page. If you still have questions, email the sales team [email protected] or call 845-565-7770. If you are looking to determine the pitch of your roof, see the Roof Pitch Diagram.
As you know by now the Aura Gravity Ventilator uses wind to help exhaust out hot attic air with no moving parts. Here is a deeper explanation of how this gravity ventilator accomplishes this function. To start, when wind enters the outer row of louvers, the angle of the louvers causes the wind to spin around the circumference of the gravity vent. Spinning air creates suction towards the center of the vent. This suction creates the necessary vacuum to extract out the heat and moisture from the attic. This function is demonstrated by the animation above. Airflow ratings were documented by Georgia Tech.
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.