Flexible Cold Air Return Duct

Have to get the air back to the furnace.

Flexible cold air return duct.

Therefore your return air duct and grill size will be 24 by 24 inches tip. These ductwork tips will help balance your air conditioning and heating system. That would then reduce the flow of conditioned air to that space. Return air ducting is necessary in almost every room.

Step 4 calculate the square root of the total. But without proper support ducts can develops sags or kinks that reduce airflow 4a 4b. 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. Most technicians are skeptical about these numbers especially on the return air side of the system.

Secure start collars image 3 into both holes. Running a metal cold air return duct between studs requires knowledge of both hvac systems and the components involved in framing. In addition its flexibility allows for easier installation in hard to reach areas. Use non insulated flexible ducting to connect the two returns image 4.

Lambro rigiflex 4 in x 96 in aluminum semi rigid flexible duct. 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. Cut two holes one in the stud cavity and the other one into the existing return image 2. 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.

Can accept any size collar up to 18 in. Product is knocked down for shipping and must be. Nail a piece of sheet metal onto the back of a stud cavity. Can be easily cut to size.

Diameter of duct x 3 14 return air duct in square inches. The square root of 576 is 24. Used as a central return vent box filter grill not included. 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.

4 ton unit x 144 square inches 576 squared. Hvac ductwork sizing is critical for proper heating and cooling in every room. 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.