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How to Retrofit Air Conditioning Using Mini Ducts

In this video, This Old House plumbing and heating contractor Richard Trethewey explains the benefits of this felxible cooling system.

Mini duct HVAC systems are a gift to remodelers. Snaking small flex ducts through existing walls, floors, and the ceiling is 100 percent less invasive than using standard ductwork.

If you haven't heard of these systems, this short video will give you an idea of what they are all about. You can also send a link to the video to your customers. They can see the advantages of these systems immediately.

How Mini Duct Air Conditioning Systems Works

Air is drawn in through a single return duct. The air is then pulled into the air handler mounted in the attic where it’s cooled. The main supply trunk of larger ducts connects to the air handler. Cooled air passes from the supply trunk to small-diameter ducts throughout the attic. Each small duct is attached to a round outlet that’s cut into the ceiling of each room. The outlets are placed in the corner of the ceiling to avoid blowing cool air directly onto people in the room.