Tips for Properly Sealing Ductwork Tips for Properly Sealing Ductwork

All kinds of ductwork, from HVAC to AC units need to be able to carry a large amount of air, without losing any through leaks and gaps. In order to make sure that air cannot escape from your ductwork, you need to properly seal it, allowing the hot or cool air to arrive at its destination. Properly sealing ductwork is not difficult.

Seal the Accessible Areas

Start with the parts of the ductwork you can easily reach, such as the vents. You can use caulk around the edge of the vents to ensure that it is airtight, and you can also wrap tape around the sides of the ducts where they join the vents. This will help to keep both secure. Use a mesh tape to fully secure all of the seams, taking care to seal the mesh tape by pressing out creases and wrinkles in the seal. This will help to prevent air travelling down the join.

Use Duct Mastic

The other option for sealing ducts is to use a cement known as duct mastic. This should be applied over duct seals after some tape has been applied, rather like adding caulk after screws have been fitted to a surface. Pressing down on the mastic can help to squeeze out air bubbles.

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