Return Air Duct

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.

Return air duct. Return air ducts usually use ceiling joist spaces as the actual duct. Hvac return air is important. Air from your rooms must get back to the furnace or air conditioner. Can accept any size collar up to 18 in.

Step 4 calculate the square root of the total. Have to get the air back to the furnace. If you had no return air in your room you would create a positive pressure. That would then reduce the flow of conditioned air to that space.

Most rooms must have a return duct. Return air ducting is necessary in almost every room. These ductwork tips will help balance your air conditioning and heating system. That is why you need a cold air return image 1.

Without a return air duct the air would not properly circulate and your energy costs would rise. Can be easily cut to size. A return air duct is what carries air back to the furnace after it is dispensed throughout the home through the supply duct. Nail a piece of sheet metal onto the back of a stud cavity.

4 ton unit x 144 square inches 576 squared. For the system to work you have to re circulate the air back to the furnace. The square root of 576 is 24. Used as a central return vent box filter grill not included.

Therefore your return air duct and grill size will be 24 by 24 inches tip.