Attic Vent Chute Requirements

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.

Attic vent chute requirements.

Typically made from polyvinyl chloride rigid foam board or cardboard they can be installed with a few. That said air resistance and interference such as vent grates reduces the area of true ventilation. Use it between rafters to create an air channel through insulation to help keep air flowing freely in your attic. The following are the requirements taken directly from the irc.

If you live in a cold climate checking the attic during the winter will help you make a better determination. It is compatible with 3 or 4 ductwork and includes a 3 to 4 adapter for convenience. Choose one of the following products to meet the recommended intake nfva of 528 square inches. The rvk1a steel roof cap kit is an the rvk1a steel roof cap kit is an easy to install vent for ventilation fans bath rec room home gym etc.

The ventilation amount and opening size requirements can be found in section 806 roof ventilation of chapter 8 roof ceiling construction. This is where you will be able to see what is actually going on there as far as airflow and condensation. 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. Theinternational building code 2012 edition ibc 2012 requires enclosed attics and enclosed rafter spaces formed where ceilings are applied directly to the underside of roof framing to have cross ventilation for each separate space.

Without exception you should talk to a professional to determine what your home requires. This cap features both a back draft damper and bird screen preventing outside air from entering the home and birds and small pests from entering duct work. 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. Allows cool dry air to enter the attic.

The following product options will allow you to achieve an intake nfva of 528 square inches. Ventsure inflow intake vent. Attic inspection required the only way to determine whether you need attic vent chutes is to make a journey into the attic. It can be cut to fit most joist spaces and is an affordable way to meet energy code requirements for air flow.

The net free vent area nfva shall not be less than 1 150 of the area of the space being vented. The majority of the requirements related to attic ventilation have not changed much from the previous editions. For improved air circulation in the attic install the durovent 22 in.