Attic Ductwork Layout

Ductwork or duct work layout for airflow calculations rectangular duct and round duct.

Attic ductwork layout.

That may require long runs of ductwork that make it hard for your hvac system to move conditioned air to certain areas within the space. Make the layout as symmetrical as possible with branch ducts spaced evenly along the. Up against the deck may be the worst place in the attic to. The duct sizes listed in the chart provided are based on a fraction drop of 10 inches per 100 feet of lineal duct.

This equal friction method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications. Make sure your hvac contractor follows these duct design best practices and principles using manual d. This involves return air unconditioned coming into the heating cooling system. Then by heating cooling that air delivering the newly conditioned air to.

Runs that are too long. Well in the comments dave roberts a senior engineer at the national renewable energy lab nrel wrote about a paper he co authored last year and included a link to it. Ductwork design mistake 2. Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords.

The purpose of residential ductwork design is to properly distribute the airflow produced by your heating cooling system to your house. Sometimes the best route for a flexible duct run is up and over an obstruction. Place ducts on top of joists in a ceiling or attic. 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.

Route ducts between joists in a basement if possible or over them if necessary. But without proper support ducts can develops sags or kinks that reduce airflow 4a 4b. 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. When the location of hvac equipment and duct system and not optimized in the planning phase the equipment may end up far away from the space to be cooled.

Avoid any hot elements such as water heaters heater or stove. Situate the air handler close to the center of the layout to minimize the length of ductwork spans.