Wouldn t it be better to just have the duct run directly 18 to the ahu.
Hvac ductwork attic ductwork layout.
Make the layout as symmetrical as possible with branch ducts spaced evenly along the trunk duct and each branch of similar length.
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.
After all it s hard to get cold air from a warm pipe.
There are a few different elements to efficient design.
It was new when the ac was put in 7 years ago.
The following duct sizes are based on a fraction drop of 10 inches per 100 feet of lineal duct.
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.
Make sure your hvac contractor follows these duct design best practices and principles using manual d.
Place ducts on top of joists in a ceiling or attic.
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.
Larger volumes or higher static pressures should be dealt with on an individual job basis.
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.
Ductwork design mistake 1.
This equal friction method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications.
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.
Use ducts for all air distribution do not use building cavities such as walls or raised floors.
Situate the air handler close to the center of the layout to minimize the length of ductwork spans.
For an efficient layout.
So when we have a choice we prefer hvac systems located under the house.
Avoid any hot elements such as water heaters heater or stove.
Here are some of the common ductwork design mistakes that impede the function of your air conditioning.
The layout and installation of the duct system will incorporate these basic principles of good ductwork design.
Ductwork components consist of ducts air supply registers return grilles insulation and sealing tape or cement.
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.
Route ducts between joists in a basement if possible or over them if necessary.
