How To Run Flexible Ductwork In Attic

One interesting bit of info that many installers need to understand is that flex ducts need to have the inner liner pulled tight.

How to run flexible ductwork in attic.

Hard ducts without proper mooring will be unbalanced and unbalanced ductwork might be to blame for a number of hvac problems. Sometimes the best route for a flexible duct run is up and over an obstruction. I called out the original hvac company and they took a look and said they saw no water. 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.

In my experience heating ducts that run through attics cause serious problems in snow country. Unfortunately this practice is all too common in our northern cold climate putting air conditioning ducts in the hottest. Give your ducts the proper support. 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. Isley s home service inc. 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. Make sure the studs and bays line up well enough to leave a clear path.

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. Improperly supported flex. The attic ductwork is flex duct work.

If quiet operation and energy efficiency are very important to you you might want to go with duct board made from pressed fiberglass which is more expensive but very quiet and efficient. But without proper support ducts can develops sags or kinks that reduce airflow 4a 4b. 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. Don t let a contractor talk you into it.

For more information about the use of flexible ducts read this achrnews article about ductwork design. It was new when the ac was put in 7 years ago. If it s not tight the friction rate jumps significantly and that means the air flow takes a hit.