How To Run Flexible Ductwork In Attic

Make sure the studs and bays line up well enough to leave a clear path.

How to run flexible ductwork in attic.

In my experience heating ducts that run through attics cause serious problems in snow country. 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. In warm climates it is common practice to run heating and air conditioning ducting through attic spaces simply because it is easy to do. Don t let a contractor talk you into it.

But without proper support ducts can develops sags or kinks that reduce airflow 4a 4b. The diagram below shows that if a flex duct has even 15 longitudinal compression the friction rate doubles. One interesting bit of info that many installers need to understand is that flex ducts need to have the inner liner pulled tight. The attic ductwork is flex duct work.

Hard ducts without proper mooring will be unbalanced and unbalanced ductwork might be to blame for a number of hvac problems. 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. Give your ducts the proper support. 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.

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. This is a short training video to show technicians and homeowners how to properly install flex duct to plenums. For more information about the use of flexible ducts read this achrnews article about ductwork design. I called out the original hvac company and they took a look and said they saw no water.

Choose the right duct size and layout. Sometimes the best route for a flexible duct run is up and over an obstruction. If it s not tight the friction rate jumps significantly and that means the air flow takes a hit. It was new when the ac was put in 7 years ago.

Isley s home service inc. Improperly supported flex. Unfortunately this practice is all too common in our northern cold climate putting air conditioning ducts in the hottest.