Air Conditioning Duct | McMaster-Carr

	Duct Size Duct Size

2
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

	ID ID

	OD OD

	Shape Shape


Straight	90° Elbow

Adjustable- Angle Elbow	Cap

45° Elbow	Tee

Wye	30° Elbow

60° Elbow

	Material Material

	Finish Finish

Aluminum-Zinc Alloy Coated

Painted

Powder Coated

	Component Component

	Connection Type Connection Type

Press Fit

Interlocking Bracket

Quick-Disconnect Clamp

	For Use With For Use With

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

DFARS Specialty Metals
COTS-Exempt

	Gauge Gauge

	Gender Gender

Female

Male

	Color Color

	Silver		Black
	Yellow		Blue
	White		Clear
	Gray

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

RoHS Compliant

	End Construction End Construction

	Maximum Temperature Maximum Temperature

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

REACH Compliant

	Length Length

	Width Width

	Flexibility Flexibility


Very Flexible	Flexible

	Spiral Material Spiral Material

Metal

Plastic

	End Type End Type

Cuff with Belt and Buckle

	Flange Mount Type Flange Mount Type

1,636 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.

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.

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.

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.

Self-Cleaning Blast Gates

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

Easy-Install Blast Gates

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

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.

Snap-On Collars for Drop-Ceiling Diffusers

Connect diffusers to duct.

Dampers for Drop-Ceiling Diffusers

These dampers regulate airflow.

Duct Noise Reducers

These noise reducers mount directly to spiral duct to decrease noise by as much as 50%.

Quick-Open Duct Access Panels

The panels open and close by turning the knobs.

Wall Vent Caps

Sloped Roof Vent Caps

Duct Access Panels

Also known as cleanouts, panels cover cutouts in duct to provide access for inspection and cleaning.

Vibration-Damping Duct Connectors

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

Gas and Chimney Vents

Gas Chimney Vents and Fittings

For use with gas-fired equipment, such as boilers and furnaces, these vent pipes and fittings withstand temperatures up to 400° F. Also known as type B gas vents.

High-Temperature Chimney Vents and Fittings

Built to withstand temperatures up to 1000° F, these vent pipes and fittings are for use with boilers, furnaces, stoves, and other equipment that is fired by coal, gas, oil, propane, or wood.

Spark-Protection Chimney Vent Caps

The expanded mesh on these vent caps provides spark protection.

Chimney Vent Caps

Cover chimneys to reduce downdrafts and prevent obstructions from entering.

Exhaust Pipe Caps

Keep rain and debris out of vertical exhaust pipe with these caps that open with slight pressure from exhaust.

Duct Hose and Fittings for Air

Insulated Duct Hose for Indoor Air

Insulated with a layer of fiberglass, this ultra-thin lightweight hose keeps air at a constant temperature.

Bend-and-Stay Metal Duct Hose for Air

Unlike fabric duct hose, this lightweight aluminum hose can bend around corners and hold its shape.

Crush-Resistant Duct Hose for Air

Step on this polypropylene hose and the flexible plastic spiral will pop back up unharmed.

Easy-Store Duct Hose for Air

The most compressible hose we offer, this duct hose collapses to 5% of its length for easy storage.

Blo-N-Vent Duct Hose with Wear Strip for Air

A general purpose duct hose for blowing and venting air, this polyester hose is lightweight and has a wear strip to protect against damage.

Blo-N-Vent Duct Hose for Air

Our most versatile duct hose for blowing and venting air, this polyester hose is lightweight and very flexible.

Disposable Duct Hose for Air

Super thin and lightweight, this hose is economical and rolls up for easy disposal.

Heat-Reflective Duct Hose for Air

A metalized polyester cover reflects heat so the temperature inside the hose won’t rise.

Quick-Attach Duct Hose with Wear Strip for Air

The ends of this hose have a belt-and-buckle connection that eliminates the need for clamps.

Insulated Blo-N-Vent Duct Hose with Wear Strip for Air

A layer of fiberglass insulation helps maintain the temperature inside the hose. Use for heating and cooling applications in outdoor environments.

High-Temperature Duct Hose with Wear Strip for Air

An acrylic coating allows this polyester hose to hold up under higher temperatures than other fabric hose.

Sanitary Snap-In Duct Hose and Fittings

Transfer material from sifters, feeders, and strainers to other parts of your sanitary line with these hose lengths and fittings.