Hvac Ductwork Attic Ductwork Layout

Ductwork design mistake 1.

Hvac ductwork attic ductwork layout. There are a few different elements to efficient design. Wouldn t it be better to just have the duct run directly 18 to the ahu. I called out the original hvac company and they took a look and said they saw no water. Contractors can make the mistake of failing to consider the type of air conditioning system you have load requirements of different rooms where ducts and equipment are located and the materials used.

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. So when we have a choice we prefer hvac systems located under the house. Chapter 4101 2 6 duct systems. Avoid any hot elements such as water heaters heater or stove.

Place ducts on top of joists in a ceiling or attic. For hvac duct systems located in the attic sealing and insulating the attic with spray foam insulation is the only way to protect the system from the extreme temperatures we live with here in metro atlanta. Here are some of the common ductwork design mistakes that impede the function of your air conditioning. For an efficient layout.

Situate the air handler close to the center of the layout to minimize the length of ductwork spans. The attic ductwork is flex duct work. After all it s hard to get cold air from a warm pipe. Larger volumes or higher static pressures should be dealt with on an individual job basis.

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. Make sure your hvac contractor follows these duct design best practices and principles using manual d. The layout and installation of the duct system will incorporate these basic principles of good ductwork design.

The following duct sizes are based on a fraction drop of 10 inches per 100 feet of lineal duct. Ductwork components consist of ducts air supply registers return grilles insulation and sealing tape or cement. Use ducts for all air distribution do not use building cavities such as walls or raised floors. When a reference is made within this rule to a federal statutory provision an industry consensus standard or any other technical publication the specific date and title of the publication as well as the name and address of the promulgating agency are listed in rule 4101 2 15 01 of the administrative code.

Remodeled home attic mounted hvac unit return box mounted approx 18 from side of ahu end has 20 flex duct attached and run in a big loop 10 15ft around to the end of the ahu.