How To Secure Sheet Metal For Ducting

Add support straps or nylon ties to support the duct.

How to secure sheet metal for ducting.

Welding can be dirty and time consuming. If necessary switch the wires to reduce the blower to its lowest speed. Ryan shanahan i ve been told to avoid using metal screws with flex duct because the flex can tear easily once you create a hole. Insert 1 2 inch self tapping sheet metal screws through metal ducts where the ends come together.

Insert a 1 2 inch long self tapping sheet metal screw at the location where the two ducts overlap to provide a solid connection. Also if you have ever tried reaching into a dryer exhaust duct to clean it by hand and had your arm ripped open by the sms screw you may have another objection. Check the speed of the blower motor on the furnace. Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct.

Some manufacturers recommend against using sheet metal screws to secure dryer duct sections because the screws collect lint. Insert two additional screws along the seam with equal spacing between the three screws. Adhesives for example have been known to fail especially when heat or vibration are present. Use a paintbrush to apply duct mastic to the joints where an elbow connects to a duct.

Turn the screw at high speed on the end of a drill and bit while pushing it firmly against the. Cover the complete duct with insulation and use tape to secure it in place. However finding a suitable fastening approach has not been easy. You can even use three sheet metal screws behind the first rib or two of the duct as long as you use mastic under the duct at the sheet metal connection.

Step 4 use screws and foil tape to hold the fiber board duct pieces together. The three screws will prevent the two ducts from moving and separating at the new seam.