Install Hvac Return Duct

Hvac ductwork sizing is critical for proper heating and cooling in every room.

Install hvac return duct.

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. Attach a second air duct to the first by peeling back the insulation. This allows the air to get into the return air duct. If the air duct isn t long enough it is possible to add extra length.

Remove existing ductwork where needed. In most cases if you are installing ducts in each room where there is a supply you will want to go with the same size as your supply vents. Running a metal cold air return duct between studs requires knowledge of both hvac systems and the components involved in framing. Install the square return air duct perpendicular to the joists.

Cut holes in the top of the return air duct to match the holes in the panning. Not only does the location of your return ducts make a major difference but the size does as well. Whether return ducts are used most homes have return ducts. Put the crimped end in first then put the other end of the duct in.

The design of ductwork is as important to a home heating and air conditioning system as the unit that powers it. Ducts that are improperly sized installed with crimps or tight bends have leaks or are not balanced between supply conditioned air and return used air will cause the system to operate inefficiently. Standard door undercut plus a small jumper duct always with fully extended flexible duct to the return zone can only handle up to about 100 cfm. These ductwork tips will help balance your air conditioning and heating system.

Run the new flexible air duct under the house from the floor return to the underside of the air handler and attach to the metal vent box or plenum image 1. Return air ducting is necessary in almost every room. The takeoff rotates to make it easier to fit the duct into place. Sizing your return ducts usually depends on the size of your ducts as well as the size of your hvac system.

You want to run it so it covers up all the holes you cut in the panning. Install the damper into the duct by drilling a hole into the side of the duct and then screw the damper into place. Return air duct is connected together using s slips and drive cleats. So putting in smaller systems that deliver more thermal capacity to the intended targets using best installation practices means that systemic problems are avoided.

A few homes with open floor plans and a first floor hvac system don t require them as air is easily drawn back to the furnace or air handler. Have to get the air back to the furnace.