Residential Attic Ductwork Layout

The most common design trunk line layout is provided in the illustration below.

Residential attic ductwork layout.

When were the ducts installed. Duct system design considerations part 1 by roger m hensley cms. Most residential structures can accommodate one or more of these configura tions. 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.

A duct system located in an attic. 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. Typical trunk and branch duct systems. Number one is the heating and cooling load calculation using a protocol like acca s manual j or the ashrae handbook of fundamentals.

Place ducts on top of joists in a ceiling or attic. Look at the following factors when assessing your aging ductwork design. The residential forced air duct system. It was new when the ac was put in 7 years ago.

This hvac for beginners section begins here with a discussion about forced air duct systems the basics the how and why of duct sizing. Route ducts between joists in a basement if possible or over them if necessary. 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. 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.

Up against the deck may be the worst place in the attic to. You ve got to know how much heating and cooling you need for each room in btu hr. The attic ductwork is flex duct work. From these trunk lines come branch ducts usually round that extend.

Situate the air handler close to the center of the layout to minimize the length of ductwork spans. I called out the original hvac company and they took a look and said they saw no water. Make the layout as symmetrical as possible with branch ducts spaced evenly along the trunk duct and each branch of similar length. There are six basic locations for supply duct systems in residential structures.

Designing a duct system is important but there are a few critical steps that come first. The layout and installation of the duct system will incorporate these basic principles of good ductwork design. One of the most important jobs of the designer. Aging ductwork can compromise your system s optimum performance efficiency and air quality.

Often residential ductwork from the original construction was designed inexpensively and without much thought for longevity. To account for all the necessary factors many professionals use a tool called acca manual d. Ductwork is simply an air delivery system.