Gravity Roof Ventilator

An extensive range of sizes is offered with many standard and optional features.

Gravity roof ventilator. 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. They are a sturdy multi use cap designed for a sloped roof and have a metal band to prevent crosswinds and rain. Aura roof ventilator 18 diameter aluminum gravity vent with a 8 collar height and 24 x 24 square flange. The aura gravity roof ventilator vigorously removes heat from the attic in the summer and moisture from the attic in the winter.

Bgh gravity ventilators offer a modern low silhouette design that blend with roof lines and other equipment. How does it do this. Functioning with no moving parts the aura gravity ventilator pulls hot attic air every time the wind blows. The model av 18 c8 has 254 square inches of net free air space.

Built in curb cap with prepunched holes for easy attachment to roof curb. All gravity vents have a built in screen for bugs and are available in small 4 inch sizes up to 48 inch 4 foot round connections for industrial barn or warehouse venting. Designed for maximum airflow passage and weathertight integrity bgh comes in either intake or relief models with aluminum or galvanized finishes. Low profile hood has a rigid aluminum corrosion resistant construction.

It is best used for flat roof applications up to 5 12 roof pitch without modification. Gravity roof ventilation turbo charged. The strong weathertight hood is constructed of interlocking arched galvanized steel panels. Gravity vents are often called globe vents or barn 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 or natural ventilation is a means of ventilating a building by strategically placing openings in the building exterior in order to take advantage of naturally occurring phenomena. These hooded gravity roof ventilators are designed for nonpowered ventilation or can be used in conjunction with powered exhaust supply or reversible fans. The aura gravity ventilator functions like a spinning roof turbine but does not need to spin in order to work.

Gravity ventilation gravity ventilators are used to equalize a building s positive or negative pressure created by other fans in the system. Twin city fan offers both spun aluminum and hooded ventilators featuring a low silhouette for low roof lines. Gravity vents are placed on the roof being the highest part of the structure to provide for exhaust of building air.