Duct Fittings | McMaster-Carr

	Trade Size Trade Size

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	Shape Shape


30° Elbow	45° Elbow

90° Elbow	Adjustable- Angle Elbow

Cap	Straight

Tee	Wye

	Material Material

	Finish Finish

Galvanized

Painted

PVC Coated

	System of Measurement System of Measurement

Inch

	ID ID

	OD OD

	Component Component

	Connection Type Connection Type

Interlocking Bracket

Press Fit

Quick-Disconnect Clamp

Worm-Drive Clamp

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Gauge Gauge

	End Construction End Construction

	Gender Gender

Male

Female

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	Flange Mount Type Flange Mount Type

Screw On

Weld On

	Mounting Location Mounting Location

	Gate Material Gate Material

	Color Color

	Black		Brown
	Clear		Gray
	White

	Duct Construction Duct Construction

Closed

Open

	Slide Material Slide Material

Steel

Stainless Steel

Plastic

	Width Width

	For Duct Shape For Duct Shape

Round

Square

Rectangular

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1,525 Products

About Duct Connections

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.

Sure-Seal Spiral Duct and Fittings

Fittings have gaskets which create a tight seal—you don't need to seal joints with coating or tape.

Crush-Resistant Spiral Duct and Fittings

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

Chemical-Resistant Duct and Fittings

Made of PVC plastic to withstand acids, alkalies, salts, and other corrosive vapors and fumes.

Rectangular Duct and Fittings

Often used in tight spaces, such as in walls and ceilings, rectangular duct allows you to select larger sizes without increasing duct height.

Straight-Run Fabric Duct

Evenly distribute air from fans and blowers throughout large spaces.

Vent Caps

Wall Vent Caps

Flat Roof Vent Caps

Sloped Roof Vent Caps

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.

Automatic Blast Gates

More convenient than other blast gates, these automatic gates open and close in sync with dust collectors, fume exhausters, and other machines.

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.

Airflow Dampers

Regulate airflow by adjusting dampers from fully open to fully closed.

Fire-Rated Airflow Dampers

In the event of a fire, these dampers automatically stop airflow through duct.

Automatic Airflow Dampers

Save energy and increase comfort by heating and cooling only the areas that need it.

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.

Vibration-Damping Duct Connectors

Add a flexible joint to your system to reduce vibration caused by fans and blowers.

Diffusers, Registers, and Grilles

Floor Registers

Install onto floor ducts to direct hot and cold air from your HVAC system.

Ready-to-Connect Drop-Ceiling Diffusers

No additional fittings or collars needed.

Ready-to-Connect Moisture-Resistant
Drop-Ceiling Diffusers

No additional fittings or collars needed.

Wall/Ceiling Registers

Direct air coming out of HVAC systems. Adjust the damper to control airflow.

Return Grilles with Filter Holder

Add a filter to these grilles for protection against dust and debris entering your HVAC system.

Moisture-Resistant Drop-Ceiling Diffusers

A vapor barrier provides moisture protection as these diffusers spread hot or cold air around a room.

Drop-Ceiling Return Grilles with Filter Holder

Place these grilles in the grid of a drop ceiling.

Return Grilles

Cover the opening where air is pulled into your HVAC system.

Air Diverters

Guide air toward your workspace or deflect unwanted drafts with these diverters and covers.

Snap-On Collars for Drop-Ceiling Diffusers

Connect diffusers to duct.

Ready-to-Connect Ceiling Diffusers

Diffusers come with a collar and damper already in place for simple installation.

Ceiling Diffusers

Evenly disperse airflow into a room to maintain a consistent temperature throughout the space.

Dampers for Drop-Ceiling Diffusers

These dampers regulate airflow.

Drop-Ceiling Diffusers

Place these diffusers in the grid of a drop ceiling to distribute air evenly throughout your space.

About Duct Connections

Duct and Fittings

Standard Duct and Fittings

Quick-Disconnect Duct and Fittings

Sure-Seal Spiral Duct and Fittings

Crush-Resistant Spiral Duct and Fittings

Chemical-Resistant Duct and Fittings

Rectangular Duct and Fittings

Straight-Run Fabric Duct

Vent Caps

Wall Vent Caps

Flat Roof Vent Caps