Installation of Pipe and Fittings

Single Wall – Slip Fit

The fittings are male sized to slip into the pipe section. A good tight fit is necessary for minimizing friction loss and good sealing. Care should be taken during handling to avoid any dents or distortions that can cause improper fit and difficult installation.

1. Tilt fitting slightly and start bottom part of collar into duct 

2.  A sharp blow to the top of the collar with hand or sheet metal mallet can cause the collar to seat into the duct. For larger sized duct, straddle the duct and slightly compress duct sideways while another man jiggles the fitting into the duct. 

3.  As a last resort, a half moon can be cut on top of the collar to eliminate the ‘high spot’ and the fittings slips easily into place.

Double Wall – Slip Fit

The inner and other collars of fittings are male and designed to slip into the connecting duct. The inner collar projects beyond the outer collar permitting the inner collar to be started into the inner liner of the duct section, similar to the single wall technique.

1. Bring bottom of the inner collar into the duct section at a slight angle 

2. Using slight pressure, work the rest of the inner collar into the duct 

3. When the inner collar is fully started into the duct, start the outer collar in the same manner. Tilt the bottom edge slightly upon insertion and tap the ‘high spots’ to work the collar into the duct.

To save time, it is suggested to save time, sub-assemblies be made on the floor and then hoisted into place.

Additional Suggestions for Installation

1. Use two blocks of wood in assembling your duct, using your hands and moving the duct in an up and down motion will help you make your connection without damaging the duct. 

2. Allowance has already been made in fittings for installation. Should a kink occur through handling, by carefully straightening out the kinks and bends a good connection can still be made. 

3. DO NOT use a hammer and screwdriver to make a connection. The possibility of causing damages internally is a real danger to friction loss. Apply pressure with the heel of your hand or a good thump with your fist can help the fitting slip into the duct. 

4. Apply duct sealant to the internal end of the spiral approximately 1” and apply duct sealant around the slip part of your fitting. As the fitting slips into the spiral duct, the sealant will not scrape off in the slip connection. 

5. Whenever possible, brush your internal joint to make it smooth inside and out. Also inspect your sealed joints for coverage. One to two days after completing the connections, check connections for shrinkage of the duct sealant. Reapply sealant where needed. 

Print Installation Tips

Read Anatomy Of Installing PVS Air Duct Brochure 

Specialty Metals