How to Install Flex Ducts
Flexible ducts can be a cost-effective way to install ducts in buildings. As long as you follow some basic installation guidelines, flex ducts can be a good alternative to sheet metal duct systems and should provide years of trouble-free use. Does this Spark an idea?
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Instructions
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Cut a length of flex duct that fits the installation site with little to none left over. Stretch the flex duct between the two points of attachment so that the duct doesn't sag. Prevent the duct from bending too much, causing the duct's width to narrow more than the standard width of the duct anywhere along its length.
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Attach the flex duct to the duct fitting with at least 1 foot of the duct around the fitting. Keep the flex duct in place by wrapping duct tape around the connection at least twice. Place a metal clamp around the connection and apply paste around the edges of the clamp.
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Replace the jacket of the flex duct by pulling its insulation over the connection. Tape the jacket into place with at least two layers of duct tape.
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Tips & Warnings
You can cut the flex duct with scissors or a knife, then use wire cutters to cut through the wire running through the duct material.
Avoid placing your flex ducts in direct sunlight or too close to heating sources to prevent premature breakdown of the duct material.
Prevent constriction of the flex ducts by installing the ducts only in areas that allow for the width of the flex ducts.
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Comments
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Ernest Medina
Sep 18, 2010
how do remove old ducts, i can't see any clamps or plastic ties that hold the ducts on? -
Susan Crook
Feb 26, 2010
FYI - There is another product - SMART Flow Elbow distributed by Hart & Cooley that works well, too. It takes the kinks out of flex duct (same as kinking a garden hose) to allow full airflow, saving energy and reduces excess wear-and-tear on the HVAC units.
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GreenPro
Dec 14, 2008
You can also avoid kinking the flex duct by instaling a "durable elbow support" called FlexRight by Titus. FlexRight is a radius forming brace that straps over the outside of flex duct to hold it in a 90-degree elbow shape improving airflow and saving energy.
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GreenPro
Dec 14, 2008
You can also avoid kinking the flex duct by instaling a "durable elbow support" called FlexRight by Titus. FlexRight is a radius forming brace that straps over the outside of flex duct to hold it in a 90-degree elbow shape improving airflow and saving energy.
