HVAC Fittings | McMaster-Carr

	Trade Size Trade Size

2
3
3.5
3 1/2
4
4.5
4 1/2
5
5.5
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

	Shape Shape


Straight	90° Elbow

Adjustable- Angle Elbow	Wye

Tee	Cap

45° Elbow	30° Elbow

	Material Material

	Finish Finish

Galvanized

PVC Coated

	ID ID

	OD OD

	Component Component

	Connection Type Connection Type

Press Fit

Quick-Disconnect Clamp

Interlocking Bracket

Worm-Drive Clamp

	Gauge Gauge

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

DFARS Specialty Metals
COTS-Exempt

	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

	Gate Material Gate Material

	Slide Material Slide Material

Steel

Stainless Steel

Plastic

	Duct Construction Duct Construction

Closed

Open

	For Duct Shape For Duct Shape

Round

Square

	Overall Depth Overall Depth

	Width Width

	Number of Mounting Holes Number of Mounting Holes

	Flange Thickness Flange Thickness

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1,344 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.

Chemical-Resistant Duct and Fittings

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

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.

Straight-Run Fabric Duct

Evenly distribute air from fans and blowers throughout large spaces.

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.

Self-Cleaning Blast Gates

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

Airflow Dampers

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

Blast Gates

Control the flow of air and material through duct systems.

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.

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.

Easy-Install Blast Gates

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

Vibration-Damping Duct Connectors

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