These can be ridge vents wind turbines or the flat vents your roofer wants to install.
Cool attic turbine.
Get free shipping on qualified roof turbines or buy online pick up in store today in the building materials department.
A ridge vent runs across the top of the roof s peak.
Ft of vent space half dedicated for air intake in the soffits and the other half for exhaust on the roof.
Attic must have 5 sq.
A single 14 inch diameter turbine vent that is subjected to 15 mph winds can expel up to 1 342 cfm of air.
A turbine is installed directly on the top of a roof and uses wind power to suck hot and humid air out of the attic.
A small 12 inch diameter turbine vent with a constant wind speed of 5 miles per hour mph can remove 347 cubic feet of air per minute cfm from the attic space.
Unlike turbines this venting style does not have any moving parts.
A turbine has a series of vanes that spin as wind passes through them.
Good attic ventilation is important for preventing ice dams in the winter.