Air Intake To The Attic

Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.

Air intake to the attic.

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. Drive nails up through the sheathing and shingles to mark roof air vent locations. Cut shingles with a utility knife. Mark attic roof air vent locations.

I would think the attic would have to be awfully tight and without venting to draw air from recessed lights. The draw from the intake in the attic will pull hot air from the house up into the attic. How many cfm s does the intake draw. Similar to the static method adequate amounts of intake air into the attic space should be provided.

From the roof s peak. So why put an hvac system up in the attic at all. 12 08 2009 09 57 am 42. 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.

Make the cutout area 1 2 in. Most updated central air conditioned homes have a new air conditioner split system meaning the ac is broken up into parts. That is split into 4 25 square feet or 618 square inches for both intake and. Blocked or covered intake vents can dramatically reduce the amount of air flow through your attic.

This value is split evenly between intake and exhaust ventilation. An outdoor unit which houses the fan condenser and compressor and an indoor unit which holds the evaporator and fan. Worth noting is that this attic air intake will pressurize the house like a balloon. Cut the shingles for roof vents.

We can open up intake vents and install proper baffles to ensure air flows into your. Well mainly it s a way to save space. Intake vents located at the lowest part of the roof under the eaves allow cool. Center nails between rafters 18 in.

Attic hvac systems save space. See figure 2. That path is supposed to be from low in the attic intake vents to the highest possible exit point in the attic exhaust vents. 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.

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. 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. 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.