Flat Roof Passive Ventilation

Active ventilation 12 in.

Flat roof passive ventilation. Could you imagine that the temperature can reach up to 150 degrees in the summer. Dia keepa vent an aluminum roof vent for flat roofs model kv 12 41 67 41 67. Passive ventilation the most common way to provide attic ventilation for asphalt shingle roof assemblies is by nonpowered passive ventilation. Made of corrosion resistant aluminum the keepa vent has a round concentric vent cap and standard 11 in.

Passive roof vents allow air flow throughout the house without the use of fans. The keepa vent is best used for flat roof attic spaces as an exhaust roof vent or fresh air supply intake roof vent. Alwitra flat roof details. Flat roof vents have no moving parts to break or squeak but don t vent as much air as wind driven vents.

They help keep the home more comfortable by providing areas where the heated moist and stale air can exit your home. Collar height square flange and an inner louver wildlife guard. 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. 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.

Principle sketches of flat roofs for passive houses available as downloads in dwg dxf and pdf formats free of charge. Wind driven roof vents will pull more air from the attic but only when the wind is blowing.