Cutting taps into Double Wall Spiral Pipe
The outer wall of spiral duct can be cut with C160 double cut hand shears but it cannot drop down to cut the inner wall.
How are contractors cutting taps into Double Wall Spiral Pipe?
A. Offset Snips
B. Double Cut Hand shear on outer wall, Liner Knife on insulation, and Snips on Inner Perforated Wall
C. Hand Held Plasma Machine
D. Other
Stages and Components of Double Wall Spiral
- 1. Contractor runs 5.394″ slit coil of 22 ga Perforated from inner wall.
- 2. Wraps and tapes Unfaced Liner around Perforated Spiral Pipe
- 3. Slides into Outer Wall of Spiral Duct
- 4. Cuts Grille taps (holes) into the Spiral solid outer wall, insulation, and Perforated Inner Wall.
Conclusion
We’re interested in feedback from the contractor on a method described below. We sell a Battery Powered Profile Nibbler that can go up and over the seams of Spiral Duct but also, because the head length is 2” deep and this tool can cut at a right angle. This allows the ability to drop down inside the hole below the outer wall and cut the inner wall.
Steps for Cutting Taps into Double Wall Spiral Pipe
Trumpf DD1010 and Step Bit
1. Using a Standard Drill (like our Trumpf DD1010), insert a Step Bit and pop a starting hole into the outer wall.
Trumpf TruTool C160 (cordless) with Chip Clipper
2. Using C160 Double cut shears (or PN200 Profile Nibbler) cut out template for diffuser.
3. Then take a Duct Knife and cut the Insulation.
4. Drop the Profile Nibbler down inside the hole to cut the inner wall of perforated (if it’s a solid inner wall, grab the Drill again first to pop a starting hole).
Trumpf TruTool PN200 (cordless) Nibbler
For more information about PN200 cordless nibblers, see video links below: