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Flat roof passive ventilation.
They help keep the home more comfortable by providing areas where the heated moist and stale air can exit your home.
Made of corrosion resistant aluminum the keepa vent has a round concentric vent cap and standard 11 in.
Dia keepa vent an aluminum roof vent for flat roofs model kv 12 41 67 41 67.
All things being equal wind driven turbine vents also known as a whirlybird roof vent do move more air than flat vents but only when the wind blows.
The benefits of passive roof vents.
The keepa vent is best used for flat roof attic spaces as an exhaust roof vent or fresh air supply intake roof vent.
This method relies primarily on natural air convection the upward movement of heated air because of its lower density but may also take advantage of wind generated pressure differences.
Principle sketches of flat roofs for passive houses available as downloads in dwg dxf and pdf formats free of charge.
Flat roof vents have no moving parts to break or squeak but don t vent as much air as wind driven vents.
Passive roof vents allow air flow throughout the house without the use of fans.
Active ventilation 12 in.
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Collar height square flange and an inner louver wildlife guard.
Alwitra flat roof details.