Attic Ductwork Design

Install the ductwork in accordance with a low profile compact duct design.

Attic ductwork design.

One on a concrete slab foundation for instance will have to start with a vertical duct to a ceiling or attic. Not providing enough returns is a common ductwork design flaw that leads to comfort complaints. The purpose of residential ductwork design is to properly distribute the airflow produced by your heating cooling system to your house. 1 the outside winter design temperatures shall be those listed for the january 2 5 percent values.

Throw duct leakage into the mix and the problems are even worse. Install ductwork so that it is in direct contact with i e. The longer the duct the more powerful blower it will require. The attic ductwork is flex duct work.

6 ductwork for cooking appliance exhaust fans shall a be of noncombustible corrosion resistant material and. 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. Principles of ductwork design if there was an award for supporting role in home efficiency and comfort the duct system would win hands down.

When hvac ducts are installed in a vented attic in a dry climate bury the ducts in attic insulation to protect them from temperature extremes in the unconditioned attic space. 5 a kitchen exhaust duct not equipped with a filter at the inlet end shall be designed and installed so that the entire duct can be cleaned. Ductwork design mistake 5. 6 tips for good ductwork design.

To maintain balanced air pressure and air movement your duct system needs return vents for air in the room to be pulled back into the hvac system. Notes to table 9 32 3 10 a. Ductwork may seem simple on the surface but there is a lot of planning that goes into designing efficient and effective home ventilation systems. The length of ducts is a key consideration.

Residential ductwork design starts on the drawing board. With hundreds of square feet of ductwork surface area in the attic and a δt of 75 f the air coming out of the vents in your home will be significantly higher than 55 f. Adapt the design to the type of unit. The design and efficiency of the ductwork system bears heavy on energy bills home comfort and a c and furnace performance as well as efficiency and wear which is notable considering the typical ductwork has no moving parts.

All information provided in this document is to be used as a guideline only. I called out the original hvac company and they took a look and said they saw no water.