Ductwork Materials and Connections
- Ductwork materials include sheet metal, fiberglass duct board, and flex duct, all connected by metal fittings.
- These materials are used to distribute air to rooms and back to the central HVAC system.
Sheet Metal Ductwork
- Made from thin galvanized steel shaped to the engineered size.
- Can be fabricated on-site by contractors or prebuilt by manufacturers.
- Available in rectangular or round shapes and assembled with fittings for on-site installation.
- Insulation options include external fiberglass or bubble wrap, or internal fiberglass liners.
Fiberglass Duct Board
- A cost-effective and quicker alternative to sheet metal.
- Made from sheets of faced duct board that can be cut and built as needed.
- The facing prevents fiberglass from eroding into the airstream.
Flex Duct
- A round, spiral, flexible duct that can be stretched and bent to fit specific needs.
- Available in insulated (with silver foil or black jacket) and uninsulated forms.
- Insulated flex contains fiberglass insulation with an inner liner to protect the airstream.
- Uninsulated flex is used typically for exhaust venting.
- Flex duct comes in 25-foot lengths and diameters ranging from 4 to 20 inches.
Ductwork Fittings
- Metal fittings used in sheet metal, fiberglass, and flex duct systems.
- Available in various shapes to fit the structure and layout of the building.
- Key fittings include:
- Collar: Connects ductwork to the main trunk or central system.
- Coupling: Joins two pieces of ductwork together.
- Elbow: Changes the direction of rigid duct.
- Register Boot: A termination fitting at the end of a duct run, where a register connects.
- Return Box: A fabricated box where the return air begins its journey back to the HVAC unit.
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