House Attic Ductwork Layout

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.

House attic ductwork layout.

The layout and installation of the duct system will incorporate these basic principles of good ductwork design. 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. From these trunk lines come branch ducts usually round that extend. Basic ductwork trunk line layout duct work information 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.

You ve got to know how much heating and cooling you need for each room in btu hr. The 1 800 square foot brick ranch in climate zone 4 dates from the 1960s but the previous owner installed both a furnace and ductwork in the attic just four years ago. Runs that are too long. Designing a duct system is important but there are a few critical steps that come first.

Number one is the heating and cooling load calculation using a protocol like acca s manual j or the ashrae handbook of fundamentals. Avoid any hot elements such as water heaters heater or stove. Make sure your hvac contractor follows these duct design best practices and principles using manual d. Ductwork design mistake 2.

Ted has more than a few cobwebs in his attic. 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. Route ducts between joists in a basement if possible or over them if necessary. The unconditioned space also houses his hvac system.

The most common design trunk line layout is provided in the illustration below. Situate the air handler close to the center of the layout to minimize the length of ductwork spans. 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. Make the layout as symmetrical as possible with branch ducts spaced evenly along the trunk duct and each branch of similar length.

Up against the deck may be the worst place in the attic to. Place ducts on top of joists in a ceiling or attic. The 2nd duct is the return duct that attaches to the return air vents and draws the stale air out of the house through the filter and conditions it again to return to the house as conditioned air through the supply duct system.