Return Air Duct

A return air duct is what carries air back to the furnace after it is dispensed throughout the home through the supply duct.

Return air duct.

For the system to work you have to re circulate the air back to the furnace. 4 ton unit x 144 square inches 576 squared. An air return duct is basically a concealed air passageway in a home or other building that acts as a channel for pumping air out of an enclosed room and into the air conditioning or central heating system these ducts typically start with vent grates in the wall on the ceiling or in the floor. The square root of 576 is 24.

Most rooms must have a return duct. That is why you need a cold air return image 1. Used as a central return vent box filter grill not included. The duct board return air box is an r6 the duct board return air box is an r6 insulated box that installs traditionally in a ceiling.

Air from your rooms must get back to the furnace or air conditioner. Hvac return air is important. Without a return air duct the air would not properly circulate and your energy costs would rise. Nail a piece of sheet metal onto the back of a stud cavity.

If you had no return air in your room you would create a positive pressure. Return air ducts usually use ceiling joist spaces as the actual duct. Step 4 calculate the square root of the total. Return air ducting is necessary in almost every room.

Diameter of duct x 3 14 return air duct in square inches. Can accept any size collar up to 18 in. Product is knocked down for shipping and must be. Can be easily cut to size.

Have to get the air back to the furnace.