Hvac Ductwork Attic Ductwork Layout

Use ducts for all air distribution do not use building cavities such as walls or raised floors.

Hvac ductwork attic ductwork layout.

Ductwork components consist of ducts air supply registers return grilles insulation and sealing tape or cement. Ductwork design mistake 1. For an efficient layout. After all it s hard to get cold air from a warm pipe.

Here are some of the common ductwork design mistakes that impede the function of your air conditioning. The attic ductwork is flex duct work. So when we have a choice we prefer hvac systems located under the house. Wouldn t it be better to just have the duct run directly 18 to the ahu.

Larger volumes or higher static pressures should be dealt with on an individual job basis. The following duct sizes are based on a fraction drop of 10 inches per 100 feet of lineal duct. Place ducts on top of joists in a ceiling or attic. Chapter 4101 2 6 duct systems.

Make sure your hvac contractor follows these duct design best practices and principles using manual d. 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. It was new when the ac was put in 7 years ago. I called out the original hvac company and they took a look and said they saw no water.

This equal friction method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications. There are a few different elements to efficient design. Avoid any hot elements such as water heaters heater or stove. 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.

Route ducts between joists in a basement if possible or over them if necessary. 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. 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. Situate the air handler close to the center of the layout to minimize the length of ductwork spans.

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.