How To Install Flex Duct In Attic

Continue throughout the line until air can be discharged at the exit.

How to install flex duct in attic.

Pull both sides of your ductwork so that the insulation is free of the ends and then wrap duct tape around both pieces. This is a short training video to show technicians and homeowners how to properly install flex duct to plenums. Pull down the insulation so that it covers the core. Slide the webbing under the flex duct.

The official recommendation from the adc is that flex ducts should sag no more than 1 2 per foot of length between supports. Sometimes the best route for a flexible duct run is up and over an obstruction. The first thing you want to do is take either air duct sealant or mastic and spread it around the take off. The straps that hold up the flex duct need to be no less than 1 5.

Isley s home service inc. Raise the webbing until the bottom of the flex duct sits 1 2 to 1 inch off the bottom of the attic. But without proper support ducts can develops sags or kinks that reduce airflow 4a 4b. I ll show you how to get the job done right.

Spread it around with either your fingers or a disposable chip brush or disposable paint brush. Mastic comes in a bucket air duct sealant comes in a tube they re basically the same thing. The supports need to be at the manufacturer s recommended spacing but no longer than 4 maximum. Installing flexible or insulated duct is an easy diy project.

Attach the joint into the middle and secure with more duct work. Pull the webbing back toward the joist to form a loop.