Steel HVAC Ductwork | McMaster-Carr

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	Material Material	Show

Steel

	Material Material	Hide

	Shape Shape


Straight	90° Elbow

Cap	Adjustable- Angle Elbow

Tee	45° Elbow

Wye	30° Elbow

	Duct Size Duct Size

3
3 1/2
4
4 1/2
5
5 1/2
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
32
34
36
38
40
42
44
46
48
52

	System of Measurement System of Measurement

Inch

Metric

	ID ID

	OD OD

	Finish Finish

Galvanized

Painted

PVC Coated

	Component Component

	Connection Type Connection Type

	Press Fit
	Interlocking Bracket
	Quick- Disconnect Clamp

	Gauge Gauge

	Width Width

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

DFARS Specialty Metals
COTS-Exempt

	Gender Gender

Female

Male

	End Construction End Construction

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

REACH Compliant

	Length Length

	Height Height

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

RoHS Compliant

	Duct Construction Duct Construction

Closed

Open

	Flange Mount Type Flange Mount Type

Screw On

Weld On

	Maximum Temperature Maximum Temperature

250° to 499° F

500° to 749° F

750° to 999° F

	Flexibility Flexibility

	Rigid

	Material Thickness Material Thickness

921 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.

Crush-Resistant Spiral Duct and Fittings

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

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.

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.

Automatic Airflow Dampers

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

Fire-Rated Airflow Dampers

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

Airflow Dampers

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

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.