Flexible Cold Air Return Duct

These ductwork tips will help balance your air conditioning and heating system.

Flexible cold air return duct.

In addition its flexibility allows for easier installation in hard to reach areas. Lambro rigiflex 4 in x 96 in aluminum semi rigid flexible 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. Nail a piece of sheet metal onto the back of a stud cavity.

Flexible duct can be installed in place of galvanized pipe in many applications if allowed by your local hvac codes. Step 4 calculate the square root of the total. Item 1790033 model 1790033. Use non insulated flexible ducting to connect the two returns image 4.

That would then reduce the flow of conditioned air to that space. 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. Used as a central return vent box filter grill not included. 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.

Secure start collars image 3 into both holes. The square root of 576 is 24. Hvac ductwork sizing is critical for proper heating and cooling in every room. Most technicians are skeptical about these numbers especially on the return air side of the system.

Return air ducting is necessary in almost every room. Diameter of duct x 3 14 return air duct in square inches. Can be easily cut to size. Therefore your return air duct and grill size will be 24 by 24 inches tip.

Have to get the air back to the furnace. 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. 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. Product is knocked down for shipping and must be.

4 ton unit x 144 square inches 576 squared. But without proper support ducts can develops sags or kinks that reduce airflow 4a 4b. Sometimes the best route for a flexible duct run is up and over an obstruction.