Duct Work For Attic Furnaces

The duct insulation should include a vapor barrier cover.

Duct work for attic furnaces.

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. The most common furnace fuel in the u s. Air ducts lose a fair amount of heat through leakage so shorter lengths are more efficient. Attic furnaces take advantage of the closer proximity to use shorter lengths of air duct.

The master flow 4 in. I called out the original hvac company and they took a look and said they saw no water. It was new when the ac was put in 7 years ago. If it is not sealed properly then you are heating and cooling your crawlspace and or attic.

If you have leaky ductwork in your home or office then you are losing heat or cooling from your furnace or fan coil through the sides of it. It will not require long lengths of pipe to deliver heat to the rooms as a basement furnace does. Flexible duct can be installed in place of galvanized pipe in many applications if allowed by your local hvac codes. Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords.

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. In addition its flexibility allows for easier installation in hard to reach areas. Different types of furnaces are manufactured to burn a variety of fuels including natural gas propane oil and firewood. Insulated flexible duct r6 silver jacket is used in standard heating and air conditioning hvac systems and some venting applications.

The attic ductwork is flex duct work. Most older homes have anywhere from 10 leakage clear on up to 35 40 leakage through ductwork. Throw duct leakage into the mix and the problems are even worse. Booster fans and accessories and whole house humidifiers can help make your existing ductwork system more economical.

This additional insulation provides greater thermal efficiency to save energy. These devices are connected to ducts that deliver heated air to registers throughout the house. In last week s blog i discussed the practice of burying attic ducts in deep insulation since burying ducts is simply one of several ways to address the energy waste associated with the decision to locate ducts in a vented unconditioned attic it s worth taking a fresh look at all of the possible solutions to the attic duct problem. Recently i had another hvac company come out and put in a new bathroom vent and they told me they believed the duct work was full of water.

The duct has r6 insulation which contains 33 more insulation than the standard r4 2 product.