Nfa is the unobstructed area through which air can pass through a vent usually measured in square inches.
Attic intake fan.
Iliving 18 wall mounted exhaust fan automatic shutter variable speed vent fan for home attic shed or garage ventilation 1736 cfm 2600 sqf coverage area 4 6 out of 5 stars 200 130 69 130.
Proper attic ventilation consists of a balance between air intake at your eaves soffits or fascias and air exhaust at or near your roof ridge.
This american designed fan is designed to reduce attic temperatures and remove destructive moisture thus making your home more comfortable and reducing the load on your hvac system and lowering your electricity bills.
Help protect your roof system from premature deterioration by installing a properly balanced attic ventilation system consisting of cobra exhaust vent at the ridge and adequate intake ventilation at or near the soffit areas of your roof.
Good air intake ventilation is very important for achieving optimum performance results from your attic breeze solar attic fan.
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Electric powered 56 hybrid solar electric powered 12 solar powered 40 rough opening height in.
See figure 2.
Similar to the static method adequate amounts of intake air into the attic space should be provided.
Federal housing authority recommends a minimum of at least 1 square foot of attic ventilation evenly split between intake and exhaust for every 300 square feet of attic floor space.
This prevents hot air from seeping into your home and driving up the temperature in the living space which reduces the load on your air conditioner.
Attic breeze fans will operate at peak performance when supplied with the proper amount of ventilation.
Intake exhaust airflow in a house attic square footage 2 square inches of exhaust and square inches of intake net free area nfa needed.
Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.
However failure to supply adequate air intake ventilation will result in decreased air flow and reduced cooling performance from your product.
Ventilation manufacturers assign an nfa value to the non motorized vents they make.
Roof mount 89 roof 14 power type.
According to the national roofing contractors association nrca a power vent with an airflow rate of 1 0 cubic foot per minute per square foot of attic space measured at the attic floor is generally considered to be equivalent to a 1 150 ventilation ratio.
Intake exhaust 11 mounting position.
Intake vents located at the lowest part of the roof under the eaves allow cool.
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