When Installing, Replacing, Or Correcting Existing Flexible Duct Problems…

Keep the friction loss characteristics of flexible ducting in mind and design with it in mind. Don’t use old ‘rule-of-thumb’ guidelines.

• Keep all flexible ducts as short and straight as possible.
• Limit the number of connections between the duct branch and the diffusers.
• Limit the connections between duct branch and VAV terminal units.
• Install without any kinks
• Support all elbow supports when making turns into buckets or plenums.
• Install with no more the 15% compression from full stretched length.
• Seal all connections with duct mastic and duct ties… (not use duct tape).