Steel HVAC Ductwork | McMaster-Carr

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	Material Material	Show

Steel

	Material Material	Hide

	Shape Shape


Straight	90° Elbow

Adjustable- Angle Elbow	Cap

Tee	45° Elbow

Wye	30° Elbow

	Trade Size Trade Size

3
3.5
4
4.5
5
5.5
6
7
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9
10
11
12
13
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18
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52

	Component Component

	Finish Finish

Galvanized

PVC Coated

	ID ID

	Connection Type Connection Type

	Press Fit
	Quick- Disconnect Clamp
	Interlocking Bracket

	Gauge Gauge

	End Construction End Construction

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

DFARS Specialty Metals
COTS-Exempt

	Gender Gender

Female

Male

	Width Width

	Length Length

	Overall Depth Overall Depth

	OD OD

	Duct Construction Duct Construction

Closed

Open

	Flange Mount Type Flange Mount Type

Screw On

Weld On

	Height Height

1/8"

1/4"

	Number of Mounting Holes Number of Mounting Holes

	Elbow Orientation Elbow Orientation

Vertical

Horizontal

	Flange Thickness Flange Thickness

1/8"

9/64"

3/16"

	For Duct Shape For Duct Shape

Round

Square

	Flange Height Flange Height

1 1/4"

1 1/2"

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835 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.

Crush-Resistant Spiral Duct and Fittings

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

Sure-Seal Spiral Duct and Fittings

Gaskets create a tight seal—you don't need to seal joints with coating or tape.

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.

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

Automatic Airflow Dampers

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

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.

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.