Flex Duct Between Floors

Without it there would be tons more labor and material to make that final connection.

Flex duct between floors. Also make sure to use hvac tape and seal all of the joints between duct segments. Another biggie that i see all the time is sagging ducts. Flex ducts have a fairly non smooth surface inside which can impede airflow over long distance runs. The most common size duct used is 14 in.

If no data is available use the generic flexible duct friction loss chart in acca manual d. The straps that hold up the flex duct need to be no less than 1 5. Use the minimum length of flexible duct needed to make the connections. Occasionally we need to access the ducts between the floors to improve the airflow.

This size fits just between most floor joists. Keep flex ducts as short as possible between the hard duct and the hvac grille. Flexible duct performance in. A duct system located in an attic must be insulated and must have a vapor barrier.

But without proper support ducts can develops sags or kinks that reduce airflow 4a 4b. Hart cooley offers flexible duct products for both residential and commercial applications that provide the most economical solution to your air handling needs. Attic installations attic installations lend themselves readily to all of the duct system types. The insulation you use to wrap your ducts should leave no gaps and be at least two inches thick to work effectively at reducing or eliminating condensation on ductwork.

Adc flex duct disspelling myths for light commercial systems 1 mb pdf product information. Sometimes the best route for a flexible duct run is up and over an obstruction. The supports need to be at the manufacturer s recommended spacing but no longer than 4 maximum. The official recommendation from the adc is that flex ducts should sag no more than 1 2 per foot of length between supports.

Flex duct allows easy connection from the main duct trunk to the hvac grille. No air should be able to penetrate the ductwork and the joints are a natural weak point. Here are several ways to access ducts. Add a false return grille cut an access hole in the ceiling of the first floor in a central area to gain access to the ducts.