7 Duct Size Duct Fittings | McMaster-Carr

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About Duct Connections

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Duct and Fittings

Standard Duct and Fittings

No need for clamps or connectors—duct and fittings have a male end that is slightly smaller than its female end for simple assembly.

Quick-Disconnect Duct and Fittings

Join duct and fittings with quick-release clamps for faster disassembly and cleanout than other duct systems.

Crush-Resistant Spiral Duct and Fittings

A spiral seam gives this duct greater strength and rigidity than standard duct.

Oval Duct and Fittings

At about half the height, this oval duct fits in tighter spaces than round and rectangular duct.

Duct Flanges

Bolt flanges to equipment to start a run of duct.

Weld-On Duct Flanges

Weld flanges to equipment to start a run of duct.

Blast Gates

Control the flow of air and material through duct systems.

Easy-Install Blast Gates

Often added to existing systems, these gates install without disassembling duct. Also known as half gates.

Self-Cleaning Blast Gates

Use in dust collection systems. The slide pushes through the top of the gate to clear debris.

Furnace Draft Dampers

Furnace Draft Dampers

Also known as barometric dampers, these dampers improve furnace performance by automatically opening and closing to maintain consistent airflow despite changing environmental conditions.

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)