Air Intake To The Attic

Larger than the vent opening.

Air intake to the attic.

This value is split evenly between intake and exhaust ventilation. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. 12 08 2009 09 57 am 42. Attic hvac systems save space.

We can open up intake vents and install proper baffles to ensure air flows into your. In this post we cover the intake ventilation. Well mainly it s a way to save space. Most updated central air conditioned homes have a new air conditioner split system meaning the ac is broken up into parts.

So why put an hvac system up in the attic at all. An outdoor unit which houses the fan condenser and compressor and an indoor unit which holds the evaporator and fan. I would think the attic would have to be awfully tight and without venting to draw air from recessed lights. If two different types of exhaust vents are combined for example a ridge vent and a gable louver the primary path of air becomes the distance between the two types of exhaust vents.

The draw from the intake in the attic will pull hot air from the house up into the attic. Center nails between rafters 18 in. So not only are they creating extra work at the air handler with the attic air a good amount of inadequately conditioned air will be pushed right back outside through the envelope. See figure 2.

From the roof s peak. Gable mount attic fans quickly remove a larger volume of hot and or humid air from your attic compared to static ventilation which helps save money on your heating and cooling costs. Worth noting is that this attic air intake will pressurize the house like a balloon. Cut shingles with a utility knife.

Intake vents located at the lowest part of the roof under the eaves allow cool. Mark attic roof air vent locations. Cut the shingles for roof vents. Make the cutout area 1 2 in.

That is split into 4 25 square feet or 618 square inches for both intake and. Similar to the static method adequate amounts of intake air into the attic space should be provided. Powered roof vents such as powered gable vents use electric or solar power to pull air up from the lower intake vents and out through the roof. Attic length x attic width 150 total vent space or net free area nfa my attic has an area of 1 288 square feet so my nfa is 8 5 square feet.

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. Many homes in the area appear to have soffit or eave vents but when the vent screens are removed intake holes are blocked or non existant. Blocked or covered intake vents can dramatically reduce the amount of air flow through your attic.