Making Duct Out Of Sheet Metal

Steel plate duct bite joint.

Making duct out of sheet metal.

How to make the double seam lock. The width of the sheet 4 feet will be the. Galvanized mesh panels for making air ducts and accessories should be bite joined or riveted. This chapter describes some of the methods of measuring marking cutting forming and joining as well as installing sheet metal sections duct systems and fiber glass ducts.

In addition the use of various hand tools and power tools required in sheet metal layout and fabrication is provided. δ 1 2mm should be welded. It is normally used in the fabrication and joining of the round pipe or in joining or piecing together two sheets of metal to form a large wrap around section for square or rectangular ductwork. Snip all four corners of the duct on both ends for a distance of 1 inch and bend back the metal slightly to form flanges.

And because it is a better insulator there is less sound produced within the pipe. Place a 4 foot by 8 foot piece of sheet metal on the work table. Position it about 10 inches to 12 inches. You can model a part like this in solid edge sheet metal and flatten it.

A sheet metal transition is generally a piece of duct work that changes in cross section from one shape to another typically from a rectangle to a circle. In 1986 i use to work at the sheet metal shop where we made all the ducts and fittings almost exclusively by hands. Using a yardstick and a marker mark the edge of the sheet at the points of each of the three panel grooves per your calculations. Another reason is the smoothness of a plastic pipe is better than even galvanized steel which would then be better to reduce the turbulence mentioned in the article.

Flange butt welding should adopt gas welding. Cut along the lines you drew using tin snips to produce a length of duct with ends that angle in opposite directions. How to make hvac ducts step 1. Yes we had a hydraulic guillotine shear sheet metal brakes slip roll machine hand tools and this about it.

Lay the steel ruler on the metal parallel to the edge of the long side. The double seam is also called acme lock hammer lock and pipe lock in the sheet metal trade. Nevertheless we were able to make all kinds of rectangular and round ducts and all types of fittings. Sure you can insulate a sheet metal duct but why not buy a pipe where that is not necessary.