Attic Furnace Ductwork Layout

Make sure your hvac contractor follows these duct design best practices and principles using manual d.

Attic furnace ductwork layout.

Make the layout as symmetrical as possible with branch ducts spaced evenly along the trunk duct and each branch of similar length. This type of system incorporates the use of a trunk line or series of rectangular ducts that act as a main supply channel throughout the house. Situate the air handler close to the center of the layout to minimize the length of ductwork spans. Once all the system variables have been decided your hvac design professional can determine the most efficient ductwork design layout and calculate the correct duct size.

Choose the right duct size and layout. The layout and installation of the duct system will incorporate these basic principles of good ductwork design. From these trunk lines come branch ducts usually round that extend. Route ducts between joists in a basement if possible or over them if necessary.

To promote balanced air circulation through the supply ducts home and return ducts the ductwork should be simple in layout accurately sized sealed insulated in unconditioned spaces and installed in the right places. The most common design trunk line layout is provided in the illustration below. Place ducts on top of joists in a ceiling or attic. Unless you have a slab where the equipment would likely be in the garage venting can go directly through the roof instead of routing through an exterior wall making it much easier to install the duct work along the upper floor.