- Push the release button located on the forward portion of a five-blade crimper down to release the crimper handles.
- Slide the open jaws of the crimper over one end of round duct pipe. Pull the handles together firmly to place a crimp on the end of the pipe. Move the crimper to align the last blade of the crimper with the lower section of the previous crimp. Repeat the process -- rolling the pipe as needed -- until one end of the pipe has a continuous crimp around its circumference.
- Slide the crimp end inside a non-crimped end of duct until the depth of crimp rests inside of the other pipe.
- Secure the crimped connection by running one #10 self-tapping sheet metal screw through the connection every three to four inches with a screw gun and a 5/16 inch hex head adapter.
- Apply duct sealer to the screwed connection with a paint brush. Allow the duct sealer to cure for 24 hours before using the air conditioning system.
How to Crimp Ducting Together
Connecting round duct work correctly allows air to efficiently flow through an air conditioning system. Assembling duct connections by crimping and inserting the crimped end of the pipe into a non-crimped duct end eliminates the need for duct couplings. Couplings have a diameter slightly smaller than the pipe diameter. When air passes by an installed coupling, it contacts the fitting, causing turbulence. This reduces the efficiency of the duct system, increasing your heating and cooling bill.
Things You Will Need
- How to Join Rectangular Ducting
- How to Reroute Ducting
- How to Add a Room to an Existing HVAC
- How to Calculate Velocity of Air Through a Duct
- How to Solder Copper Tubing on an AC Compressor
- How to Connect a CPVC Pipe to a Metal Shut-Off Valve
- How to Solder A/C Lines
- How to Install a PEX Plumbing Manifold
- Tips for Splicing Copper Tubing
- How to Size a Spiral Duct
- How to Connect Pex
- How to Install a Fernco PVC Cast Iron Adapter
- How to Replace Drum Traps With P-Traps
- How to Check for Proper Duct Size