Residential Attic Ductwork Layout

To account for all the necessary factors many professionals use a tool called acca manual d.

Residential attic ductwork layout.

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. Avoid any hot elements such as water heaters heater or stove. 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.

Look at the following factors when assessing your aging ductwork design. The residential forced air duct system. This hvac for beginners section begins here with a discussion about forced air duct systems the basics the how and why of duct sizing. It was new when the ac was put in 7 years ago.

Typical trunk and branch duct systems. Designing a duct system is important but there are a few critical steps that come first. Up against the deck may be the worst place in the attic to. There are six basic locations for supply duct systems in residential structures.

Aging ductwork can compromise your system s optimum performance efficiency and air quality. When were the ducts installed. The most common design trunk line layout is provided in the illustration below. Route ducts between joists in a basement if possible or over them if necessary.

Choose the right duct size and layout. Place ducts on top of joists in a ceiling or attic. One of the most important jobs of the designer. 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 layout and installation of the duct system will incorporate these basic principles of good ductwork design. Number one is the heating and cooling load calculation using a protocol like acca s manual j or the ashrae handbook of fundamentals. Ductwork is simply an air delivery system. You ve got to know how much heating and cooling you need for each room in btu hr.

Duct system design considerations part 1 by roger m hensley cms. From these trunk lines come branch ducts usually round that extend. I called out the original hvac company and they took a look and said they saw no water. 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.

Situate the air handler close to the center of the layout to minimize the length of ductwork spans. Most residential structures can accommodate one or more of these configura tions. The attic ductwork is flex duct work.