Furnace Cold Air Return Duct

Flexible duct can be installed in place of galvanized pipe in many applications if allowed by your local hvac codes.

Furnace cold air return duct.

Cold air returns are sized 1 5 times above the supply capacity to prevent negative pressure in the system. Have to get the air back to the furnace. That would then reduce the flow of conditioned air to that space. Product is knocked down for shipping and must be.

Do not return air from bathrooms and kitchens. If the furnace is putting out 1 000 cubic feet per minute of air flow the return system must collect 1 000 cubic feet and take it back to the unit. That is why you need a cold air return image 1. An insufficient return system or one too large will reduce the efficiency of the heating and increase energy bills.

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. These ductwork tips will help balance your air conditioning and heating system. Hvac ductwork sizing is critical for proper heating and cooling in every room. Metal and flexible ductwork need to be sealed to guarantee that it is reasonably air tight for maximum efficiency use an approved foil tape or duct sealant.

Can accept any size collar up to 18 in. Used as a central return vent box filter grill not included. Can be easily cut to size. For the system to work you have to re circulate the air back to the furnace.

If you had no return air in your room you would create a positive pressure. Return air ducting is necessary in almost every room.