Flexible Cold Air Return Duct

Step 4 calculate the square root of the total.

Flexible cold air return duct.

Can accept any size collar up to 18 in. Have to get the air back to the furnace. Menards offers a wide range of ductwork pipe and fittings to help your ductwork systems run efficiently these products are used for warm air return supply and exhaust systems. Use non insulated flexible ducting to connect the two returns image 4.

First building codes in many areas require that the cold air return line gets external insulation and therefore you will need to leave a gap for the insulation around the duct return line. That would then reduce the flow of conditioned air to that space. Therefore your return air duct and grill size will be 24 by 24 inches tip. Return air ducting is necessary in almost every room.

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. Product is knocked down for shipping and must be. Lambro rigiflex 4 in x 96 in aluminum semi rigid flexible duct. Running a metal cold air return duct between studs requires knowledge of both hvac systems and the components involved in framing.

Secure start collars image 3 into both holes. 4 ton unit x 144 square inches 576 squared. Flexible duct can be installed in place of galvanized pipe in many applications if allowed by your local hvac codes. Hvac ductwork sizing is critical for proper heating and cooling in every room.

Item 1790033 model 1790033. In addition its flexibility allows for easier installation in hard to reach areas. Cut two holes one in the stud cavity and the other one into the existing return image 2. Sometimes the best route for a flexible duct run is up and over an obstruction.

Most technicians are skeptical about these numbers especially on the return air side of the system. The square root of 576 is 24. To prevent problems use saddles or straps to support at regular intervals 4c 4d follow the manufacturer s instructions but in case they get lost here is a list of best practices for. Nail a piece of sheet metal onto the back of a stud cavity.

For instance a 2 5 ton system approximately 400 cfm per ton would require 2 14 flexible return ducts or 1 very short flexible 18 duct to move the 1000 cfm required by the 2 5 ton system. Used as a central return vent box filter grill not included. Diameter of duct x 3 14 return air duct in square inches.