Main Ductork In Attic

One side of the duct system blows air through the branch ducts while the other side pulls air in.

Main ductork in attic.

Type of ductwork system the least expensive duct system is a radial system of flexible ducts in an attic running to ceiling grates. Slide the backing up and over the pipe. Peel off part of the backing. If you re used to putting ducts in the attic moving the ducts indoors probably won t be easy by martin holladay august 3 2018 a vented unconditioned attic is a terrible place to locate a furnace and ductwork.

Your first stop will be the main unit and its large ducts which are connected to the branch ducts that run throughout the house. If the ducts are going to be concealed all seams need to be taped or caulked. But in my last article i also showed you some preliminary results from a research study on buried ducts in a hot humid climate. Leave backing on the tape on metal ductwork.

Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords. Attics are almost as cold as the outdoors during the winter and can be much hotter than the outdoors during the summer. Here s bob s trick for taping a seam on a pipe that s installed close to the subfloor. As most gba readers know ducts belong inside a home s thermal envelope not in an environment that s cold in the winter.

You shouldn t install ducts in a vented unconditioned attic. Turn your hvac system on and feel around all air duct connections for any air leaks. Ductwork running along an open ceiling in the basement of a one story home is also more affordable to replace. Burying ducts in attic insulation.

With hundreds of square feet of ductwork surface area in the attic and a δt of 75 f the air coming out of the vents in your home will be significantly higher than 55 f. Yes when you bury ducts in attic insulation in a humid climate you increase the risk of water vapor condensation on the jacket of the duct insulation. Use metal flex or fiber board ducts that are insulated to code. The costliest are sheet metal ducts running in enclosed walls and ceilings.

If you live in a consistently humid climate a dehumidifier can help keep the air around your ductwork dry. If ducts are located in a crawlspace underneath your house cover the soil to reduce moisture. Cut a piece of foil tape to length. When hvac ducts are installed in a vented attic in a dry climate bury the ducts in attic insulation to protect them from temperature extremes in the unconditioned attic space.

If they are located in your attic be sure the area is properly insulated and any cracks or holes are sealed.