Gravity Type Roof Ventilator

Ul listed this gravity roof vent is rated to withstand wind pressures of over 50 psf which is equivalent to wind speeds exceeding 200 mph.

Gravity type roof ventilator.

Gravity vents are placed on the roof being the highest part of the structure to provide for exhaust of building air. Ft of vent space half dedicated for air intake in the soffits and the other half for exhaust on the roof. Often referred to as natural ventilation roof mounted gravity vents work on the principle that hot air rises as the inside of your building heats up during the day that excess heat is released naturally through the vents. The gravity intake and relief ventilators are non powered do not have a fan and work on pressure differential between the inside and outside of the building.

Gravity intake and relief ventilators for use in non powered applications. Strong weathertight hoods on these gravity exhaust and supply ventilators feature interlocking arched galvanized steel panels and include a preassembled bird screen. Use hooded gravity roof vents with either nonpowered ventilation or in conjunction with powered exhaust supply or reversible fans. These can be ridge vents wind turbines or the flat vents your roofer wants to install.

In order to take advantage of both wind pressure and stack effect gravity ventilators are generally used in conjunction with open doors and windows to ventilate the structure.