Attic Ductwork Layout

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.

Attic ductwork layout.

Avoid any hot elements such as water heaters heater or stove. Sometimes the best route for a flexible duct run is up and over an obstruction. The purpose of residential ductwork design is to properly distribute the airflow produced by your heating cooling system to your house. Ductwork design mistake 2.

Make the layout as symmetrical as possible with branch ducts spaced evenly along the. Place ducts on top of joists in a ceiling or attic. Up against the deck may be the worst place in the attic to. 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.

Situate the air handler close to the center of the layout to minimize the length of ductwork spans. 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. Then by heating cooling that air delivering the newly conditioned air to.

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. This involves return air unconditioned coming into the heating cooling system. Route ducts between joists in a basement if possible or over them if necessary. This equal friction method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications.

To prevent problems use saddles or straps to support at regular intervals 4c 4d follow the manufacturer s instructions but in case they get lost here is a list of best practices for. The layout and installation of the duct system will incorporate these basic principles of good ductwork design. The duct sizes listed in the chart provided are based on a fraction drop of 10 inches per 100 feet of lineal duct. 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.

Remember that article i wrote about ducts installed against the roof deck and how i said it was probably the absolute worst single location for installing ducts. But without proper support ducts can develops sags or kinks that reduce airflow 4a 4b.