Attic Furnace Duct Design

Make the layout as symmetrical as possible with branch ducts spaced evenly along the trunk duct and each branch of similar length.

Attic furnace duct design.

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. Hvac how to size and design ducts. The purpose of residential ductwork design is to properly distribute the airflow produced by your heating cooling system to your house. Then by heating cooling that air delivering the newly conditioned air to your home.

High efficiency furnaces aren t usually recommended for an attic. So why put an hvac system up in the attic at all. Continuing education and development inc. Situate the air handler close to the center of the layout to minimize the length of ductwork spans.

Most of the issues that furnace might experience in an attic are due to extremely cold weather in this poorly insulated space. Consider your equipment type and supporting systems. You ve got to know how much heating and cooling you need for each room in btu hr. Number one is the heating and cooling load calculation using a protocol like acca s manual j or the ashrae handbook of fundamentals.

You might not receive the same air movement benefits if the unit is in a garage either. Designing a duct system is important but there are a few critical steps that come first. Attic hvac systems save space. Adapt the design to the type of unit.

Sketch a rough design using a central supply duct from the unit to the opposite end of the house with branches forking to each outlet. Well mainly it s a way to save space. 9 greyridge farm court stony point ny 10980. Certain types of air conditioning systems like heat pumps require larger ducts.

If your system includes air purifiers with activated charcoal filters these also affect air flow and may require larger ducts and or additional air returns. Make sure your hvac contractor follows these duct design best practices and principles using manual d. If you don t have a crawl space or a basement then it can be a challenge to place a furnace on the ground floor of the structure. Most updated central air conditioned homes have a new air conditioner split system meaning the ac is broken up into parts.

An outdoor unit which houses the fan condenser and compressor and an indoor unit which holds the evaporator and fan. The layout and installation of the duct system will incorporate these basic principles of good ductwork design. A furnace can suffer from a drop in energy efficiency if it s in an unconditioned space such as an attic.