The ventilation ratios go according to attic floor size not roof size.
Colonial attic air vent.
Intake vents located at the lowest part of the roof under.
Generally speaking you need a ratio of 1 300 where for every 300 square feet of ceiling space you need 1 square foot of attic ventilation.
Featuring a low profile dome the power attic vent is unobtrusive when installed on the roof face slanting away from the front of your home.
See the benefits of attic ventilation a new roof is more than just shingles.
For this method to be most effective approximately equal amounts of ventilation should be placed at the soffits or eave level and at or near the top of the attic space.
You can go as low as 1 300 of the attic floor area for attics which have a continuous vapor barrier below to a high of 1 5 in inches x the floor area in feet.
Fan related products 19 25 in.
Cool air in hot air out attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.
That is a huge difference in allowance.
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Outside air enters the attic space through soffit or eave vents rises through the attic space as it warms and exits through vents that are positioned at or near the top.
I would go with the higher number.
In other words the entire vent opening doesn t count as vented space.
It s a roof top installed shingle over intake vent designed based on roofing contractor feedback from our ask the expert seminars.
For pricing and availability.
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Air vent high efficiencypower attic fan 1470 cfm weatherwood galvanized steel electric power roof vent.
Effective attic ventilation systems reduce damaging heat and moisture in your attic promote energy efficiency by helping to reduce the load on your air conditioner in the summer and also reduce the risk of ice dam formation on your roof.
Square white aluminum automatic shutter gable louver vent.
The edge vent provides proper intake ventilation for homes with little or no overhang.
For pricing and availability.
Air vent 1320 cfm weatherwood galvanized steel electric power roof vent.
Air vent 1500 cfm mill finish galvanized steel electric powered attic fan with built in humidistat model asrhpml 117 00 117 00.
