Galvanized Sheet Metal:
Historically the exclusive material for ductwork, it remains the most durable option.
Requires skilled labor to fabricate and install, often used where access is limited.
Commonly made from 26-gauge galvanized steel sheets.
Fabrication and Installation:
Sheet metal ductwork can be fabricated on-site or prebuilt by manufacturers.
Fabrication involves cutting and bending sheet metal into circular or rectangular shapes.
Standard sizes can be purchased and adjusted on-site, while custom sizes and fittings are made in specialized shops.
Essential Tools for Installation:
Aviation Snips: Color-coded handles with specific functions:
Yellow: Straight cuts and short jaws for cutting heavier material.
Red: Left arcs and circles.
Green: Right arcs and circles.
Hand Shears (Tin Snips): Ideal for making long, straight cuts to reduce hand fatigue.
Hand Seamer (Hand Break): Makes precise one-inch bends using hashmarks.
Setting Hammer: Used for assembling duct sections, sealing seams, and moving ducts into place.
Crimper: Reduces the circumference of one duct section to fit into another for airtight connections.
Folding Tool: Makes 1-inch and ⅜-inch bends for duct transitions and folds for drive cleats.
Calipers and Dividers: Used to measure and draw arcs or circles on the trunk line or plenum.
Hole Cutter Tool: Powered by a cordless drill, replaces calipers and snips for cutting round holes.
Duct Puller (Duct Stretcher): Draws two sections of duct together for easier installation.
Duct Installation Tips:
A second person or a duct holder is often necessary to align and hold duct sections.
Clamps and chains can temporarily suspend the duct while corners are aligned and drive cleats are installed.
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