How To Run Flexible Ductwork In Attic

This is an especially relevant tip for flex ducts more on that in a minute but you need to make sure any ducts in your attic have proper support.

How to run flexible ductwork in attic.

Give your ducts the proper support. In warm climates it is common practice to run heating and air conditioning ducting through attic spaces simply because it is easy to do. 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. If it s not tight the friction rate jumps significantly and that means the air flow takes a hit.

For more information about the use of flexible ducts read this achrnews article about ductwork design. Make sure the studs and bays line up well enough to leave a clear path. It was new when the ac was put in 7 years ago. The attic ductwork is flex duct work.

Ducts should be able to run between studs in the wall and then turn into a joist bay the space between two joists. The diagram below shows that if a flex duct has even 15 longitudinal compression the friction rate doubles. In my experience heating ducts that run through attics cause serious problems in snow country. But without proper support ducts can develops sags or kinks that reduce airflow 4a 4b.

The prior owner just had a new ac system installed in which they switched from the equipment and metal ducts in the crawlspace to flex ductwork equipment in the attic where temps have regularly been in the 130 150 degrees this summer. I called out the original hvac company and they took a look and said they saw no water. This is a short training video to show technicians and homeowners how to properly install flex duct to plenums. Hard ducts without proper mooring will be unbalanced and unbalanced ductwork might be to blame for a number of hvac problems.

Unfortunately this practice is all too common in our northern cold climate putting air conditioning ducts in the hottest. To prevent problems use saddles or straps to support at regular intervals 4c 4d follow the manufacturer s instructions but in case they get lost here is a list of best practices for. Isley s home service inc. Improperly supported flex.

Choose the right duct size and layout. One interesting bit of info that many installers need to understand is that flex ducts need to have the inner liner pulled tight. In this tutorial i am happy to show you how to properly install flexible duct to a register can for all you heating air conditioning ventilation do it your.