18" ID Duct Hose | McMaster-Carr

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46 Products

About Duct Connections

About Duct Hose

Blue Hose

Clear Hose

Very Flexible
Compatible Clamps: Worm-Drive Clamps
Color: Blue or Clear
Temperature Range: 20° to 160° F

Rugged, yet pliable PVC makes this a good general purpose hose for venting smoke, propane fumes, and water-based paint fumes. Blue hose is also for use with welding fumes. It meets UL 94 V-0 for flame retardance. Clear hose lets you see inside your line.

For technical drawings and 3-D models, click on a part number.

								Spiral
ID	OD	Bend Radius	Compresses To	Max. Vacuum	Max. Pressure	Material Thick.	Interior Surface Texture	Direction	Material	Specifications Met	Max. Continuous Lg., ft.		Per Ft.
Per Foot
Blue PVC
18"	18 3/8"	2"	20%	0.1 in. of Hg @ 72° F	1.4 psi @ 72° F	0.02"	Ribbed	Right Hand	Metal	UL 94 V-0	25	0000000	000000
Clear PVC
18"	18 3/8"	2"	20%	0.1 in. of Hg @ 72° F	1.4 psi @ 72° F	0.02"	Ribbed	Right Hand	Metal	__	25	00000000	00000
													Each
Full Coil
Blue PVC
18"	18 3/8"	2"	20%	0.1 in. of Hg @ 72° F	1.4 psi @ 72° F	0.02"	Ribbed	Right Hand	Metal	UL 94 V-0	25	00000000	000000
Clear PVC
18"	18 3/8"	2"	20%	0.1 in. of Hg @ 72° F	1.4 psi @ 72° F	0.02"	Ribbed	Right Hand	Metal	__	25	000000000	000000

Retracting Very Flexible Duct Hose with Wear Strip for Fumes

Very Flexible
Compatible Clamps: Worm-Drive Clamps
Color: Yellow; Wear Strip is Black
Temperature Range: -40° to 250° F

Let go of this hose and it will spring back out of your way. The wear strip protects the hose from damage caused by dragging. Hose meets UL 94 HB and UL 94 V-0 for flame retardance. It is for use with smoke and water-based paint fumes.

							Spiral					Per Ft.
ID	OD	Bend Radius	Compresses To	Max. Pressure	Material Thick.	Interior Surface Texture	Direction	Material	Specifications Met	Max. Continuous Lg., ft.		1-24	25-Up
Neoprene-Coated Polyester
18"	18 3/8"	10 1/2"	25%	1.3 psi @ 72° F	0.016"	Ribbed	Right Hand	Metal	UL 94 HB, UL 94 V-0	25	0000000	000000	000000

Blo-R-Vac Flexible Duct Hose for Dust

Black Hose

White Hose

Flexible
Compatible Clamps: Worm-Drive Clamps
Color: Black, White, or Blue
Temperature Range: -40° to 250° F

A good general purpose hose for blowing and vacuum applications, this hose is for use with grinding dust, sawdust, and lint.

TPR rubber hose meets UL 94 HB for flame retardance.

Warning: Hose should not be used for applications that generate a static charge.

For technical drawings and 3-D models, click on a part number.

								Spiral					Per Ft.
ID	OD	Bend Radius	Compresses To	Max. Vacuum	Max. Pressure	Material Thick.	Interior Surface Texture	Direction	Material	Specifications Met	Max. Continuous Lg., ft.		1-24	25-Up
Inch
Black TPR Rubber
18"	18 1/2"	21 1/2"	35%	2 in. of Hg @ 72° F	2 psi @ 72° F	0.03"	Ribbed	Left Hand	Metal	UL 94 HB	25	00000000	000000	000000
White TPR Rubber
18"	18 1/2"	21 1/2"	35%	2 in. of Hg @ 72° F	2 psi @ 72° F	0.03"	Ribbed	Left Hand	Metal	UL 94 HB	25	000000000	00000	00000

Abrasion-Resistant Very Flexible Duct Hose for Dust

Black Hose

Very Flexible
Compatible Clamps: Worm-Drive Clamps
Color: Clear or Black
Temperature Range: -40° to 200° F

A blend of rubber and plastic creates a hose that's flexible, yet tough enough to handle abrasive particles such as grinding dust and sawdust.

Warning: Hose should not be used for applications that generate a static charge.

For technical drawings and 3-D models, click on a part number.

								Spiral				Per Ft.
ID	OD	Bend Radius	Compresses To	Max. Vacuum	Max. Pressure	Material Thick.	Interior Surface Texture	Direction	Material	Max. Continuous Lg., ft.		1-24	25-Up
Black Polyurethane
18"	18 7/16"	16"	20%	0.5 in. of Hg @ 72° F	4 psi @ 72° F	0.02"	Ribbed	Right Hand	Metal	25	0000000	000000	000000

Very Flexible Duct Hose for Dust

Clear Hose

Black Hose

Very Flexible
Compatible Clamps: Worm-Drive Clamps
Color: Clear or Black
Temperature Range: Clear: -20° to 180° F; Black: -40° to 250° F

The small bend radius makes this hose easy to wrap around corners and install in tight spaces. It is for use with lint, dust, and sawdust.

Clear hose lets you monitor flow.

Black hose meets UL 94 V-0 for flame retardance.

Warning: Hose should not be used for applications that generate a static charge.

								Spiral					Per Ft.
ID	OD	Bend Radius	Compresses To	Max. Vacuum	Max. Pressure	Material Thick.	Interior Surface Texture	Direction	Material	Specifications Met	Max. Continuous Lg., ft.		1-24	25-Up
Clear PVC
18"	18 7/16"	3 1/2"	35%	1 in. of Hg @ 72° F	1 psi @ 72° F	0.015"	Ribbed	Left Hand	Metal	__	25	00000000	000000	000000
Black Neoprene-Coated Polyester
18"	18 1/2"	4"	15%	1.8 in. of Hg @ 72° F	3 psi @ 72° F	0.03"	Ribbed	Right Hand	Metal	UL 94 V-0	25	0000000	00000	00000

Static-Control Very Flexible Duct Hose for Dust

Very Flexible
Compatible Clamps: Worm-Drive Clamps
Color: Black
Specifications Met: UL 94 V-0
Temperature Range: -40° to 250° F

The neoprene coating on this hose contains carbon to dissipate static when hose is installed in a grounded system. Hose is for use with lint, dust, and sawdust. It meets UL 94 V-0 for flame retardance.

								Spiral					Per Ft.
ID	OD	Bend Radius	Compresses To	Max. Vacuum	Max. Pressure	Material Thick.	Interior Surface Texture	Direction	Material	Surface Resistivity, ohms/sq.	Max. Continuous Lg., ft.		1-24	25-Up
Neoprene-Coated Polyester
18"	18 1/2"	12"	20%	1 in. of Hg @ 72° F	4 psi @ 72° F	0.03"	Ribbed	Right Hand	Metal	10³	25	0000000	000000	000000

Continuous-Flex Duct Hose for Wood Chips and Plastic Pellets

Flexible
Compatible Clamps: Worm-Drive and Quick-Release Clamps
Color: Black
Temperature Range: -40° to 250° F

The neoprene coating on this hose withstands continuous motion without weakening. Hose is also for use with cardboard fibers. It meets UL 94 V-0 for flame retardance.

Warning: Hose should not be used for applications that generate a static charge.

								Spiral					Per Ft.
ID	OD	Bend Radius	Compresses To	Max. Vacuum	Max. Pressure	Material Thick.	Interior Surface Texture	Direction	Material	Specifications Met	Max. Continuous Lg., ft.		1-24	25-Up
Neoprene-Coated Nylon
18"	18 9/16"	3 1/2"	25%	1 in. of Hg @ 72° F	7 psi @ 72° F	0.026"	Ribbed	Right Hand	Metal	UL 94 V-0	25	0000000	000000	000000

Quick-Attach Duct Hose with Wear Strip for Air

Very Flexible
Color: Yellow; Wear Strip is Black
Temperature Range: -20° to 180° F

The ends of this hose have a belt-and-buckle connection that eliminates the need for clamps. To connect hose, slip a duct hose connector into one end and cinch the belt for a secure hold. Hose has a wear strip that protects against damage caused by dragging. Hose meets UL 94 V-0 for flame retardance.

							Spiral
ID	OD	Bend Radius	Compresses To	Max. Vacuum	Max. Pressure	Material Thick.	Direction	Material	Specifications Met		5 ft.	10 ft.	15 ft.	25 ft.
PVC-Coated Polyester
18"	18 9/16"	10"	10%	0.4 in. of Hg @ 72° F	4 psi @ 72° F	0.014"	Right Hand	Metal	NFPA 701, UL 94 V-0	0000000	0000000	0000000	0000000	000000000

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

Very Flexible
Compatible Clamps: Worm-Drive Clamps
Color: Yellow; Wear Strip is Black
Temperature Range: -65° to 250° F

A general purpose duct hose for blowing and venting air, this polyester hose is lightweight and has a wear strip to protect against damage. Hose meets UL 94 V-0 for flame retardance.

Hose with embedded wire ends has a wire rope sewn into each end that lets you connect lengths of hose without a duct hose connector or clamp. Squeeze the end on one hose and slip it into the opening of another.

Hose with Unfinished Ends

							Spiral				Per Ft.
ID	OD	Bend Radius	Compresses To	Max. Pressure	Material Thick.	Interior Surface Texture	Direction	Material	Specifications Met		1-24	25-Up
Neoprene-Coated Polyester
18"	18 1/2"	10 1/2"	10%	1.3 psi @ 72° F	0.013"	Ribbed	Right Hand	Metal	UL 94 V-0	0000000	000000	000000

Hose with Embedded Wire Ends

							Spiral
ID	OD	Bend Radius	Compresses To	Max. Pressure	Material Thick.	Interior Surface Texture	Direction	Material	Specifications Met		10 ft.	25 ft.
Neoprene-Coated Polyester
18"	18 1/2"	10 1/2"	10%	1.3 psi @ 72° F	0.013"	Ribbed	Right Hand	Metal	UL 94 V-0	0000000	0000000	0000000

Easy-Store Duct Hose for Air

Very Flexible
Compatible Clamps: Worm-Drive Clamps
Color: Silver
Temperature Range: 0° to 200° F

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

Duct Hose

						Spiral
ID	OD	Bend Radius	Compresses To	Material Thick.	Interior Surface Texture	Direction	Material	Specifications Met	Lg., ft.		Each
Polyester Hose with Metalized Film Cover
18"	18 3/8"	18"	5%	0.001"	Ribbed	Left Hand	Metal	NFPA 90A, NFPA 90B, UL 181 Class 1	25	00000000	0000000

Connectors

Slide these connectors into the end of your hose and secure with a clamp to create longer lengths.

Galvanized Steel
For Hose ID	ID	OD	Lg.	Specifications Met		Each
18"	17 31/32"	18"	5 3/8"	ASTM A653-07-CS Type B	00000000	000000

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

Very Flexible
Compatible Clamps: Worm-Drive and Quick-Release Clamps
Color: Yellow; Wear Strip is Black
Temperature Range: -40° to 250° F

A layer of fiberglass insulation helps maintain the temperature inside the hose. Use for heating and cooling applications in outdoor environments. Hose has a wear strip that protects against damage caused by dragging. The liner meets UL 94 V-0 for flame retardance. The ends are cuffed for easy attachment to duct hose connectors.

								Spiral		Insulation
ID	OD	Bend Radius	Compresses To	Max. Vacuum	Max. Pressure	Material Thick.	Interior Surface Texture	Direction	Material	Material	R Value	Thick.		10 ft.	25 ft.
Neoprene-Coated Polyester
18"	19 1/2"	11"	20%	0.5 in. of Hg @ 72° F	1.6 psi @ 72° F	0.008"	Ribbed	Right Hand	Metal	Fiberglass	4	1"	0000000	0000000	000000000

Blo-N-Vent Duct Hose for Air

Very Flexible
Compatible Clamps: Worm-Drive Clamps
Color: Yellow
Temperature Range: -65° to 250° F

Our most versatile duct hose for blowing and venting air, this polyester hose is lightweight and very flexible. Hose meets UL 94 V-0 for flame retardance.

							Spiral					Per Ft.
ID	OD	Bend Radius	Compresses To	Max. Pressure	Material Thick.	Interior Surface Texture	Direction	Material	Specifications Met	Max. Continuous Lg., ft.		1-24	25-Up
Neoprene-Coated Polyester
18"	18 1/2"	10 1/2"	10%	1.3 psi @ 72° F	0.013"	Ribbed	Right Hand	Metal	UL 94 V-0	25	0000000	000000	000000

Insulated Bend-and-Stay Metal Duct Hose for Air

Very Flexible
Compatible Clamps: Worm-Drive Clamps
Color: Silver
Temperature Range: -100° to 435° F

Bend this hose into position in heating and cooling applications where it’s important to maintain the temperature of the air inside the hose. Unlike fabric duct hose, this lightweight aluminum hose holds its shape once it’s curved around corners. It’s insulated with a layer of fiberglass, so it keeps air flowing through at a consistent temperature even when it’s routed through hot or cold spaces. The metalized film cover seals out moisture, protecting the insulation underneath.

This hose is not meant to be continuously flexed. Lengths beyond 6 ft. may need support.

									Spiral		Insulation
ID	OD	Bend Radius	Compresses To	Max. Airflow, fpm	Max. Vacuum	Max. Pressure	Material Thick.	Interior Surface Texture	Direction	Material	Material	R Value	Thick.	Specifications Met	Lg., ft.		Each
Aluminum Hose with Metalized Film Cover
18"	21 1/16"	14"	25%	5,000	0.58 in. of Hg @ 72° F	0.2 psi @ 72° F	0.006"	Ribbed	Right Hand	Metal	Fiberglass	4.2	1 1/2"	NFPA 90A/90B, UL 181 Class 1	8	0000000	0000000

Quick-Disconnect Duct and Fittings

Join duct and fittings with quick-release clamps for faster disassembly and cleanout than other duct systems.

Galvanized steel has good corrosion resistance. Aluminum is lightweight and has good corrosion resistance.

For technical drawings and 3-D models, click on a part number.

Adjustment Sleeves

Adjustment sleeves extend your duct length. Cut duct, then slide on the sleeve. They include an O-ring for the clamp to grasp.

Adjustment Sleeves
					Galvanized Steel		Replacement O-Rings
Duct Size	ID	Gauge	Max. Sleeve Extension	End Construction		Each		Each
18	18"	20	7"	Rolled	00000000	000000	00000000	000000

Blast Gates

Blast gates stop airflow when closed.

			Aluminum
Duct Size	ID	End Construction	Blade Material		Each
18	18"	Rolled	Galvanized Steel	00000000	0000000

Standard Duct and Fittings

No need for clamps or connectors—duct and fittings press-fit together. Male ends are crimped or tapered, making them slightly smaller than a female end for simple assembly.

Galvanized steel has good corrosion resistance. 304 stainless steel is more corrosion resistant than steel and aluminum.

For technical drawings and 3-D models, click on a part number.

Duct

Open Duct

Closed Duct

					Galvanized Steel				304 Stainless Steel
Duct Size	Female ID	Male OD	Gauge	End Construction		2 ft.	4 ft.	5 ft.		2 ft.	5 ft.
Open Duct
18	18"	17 7/8"	24	Crimped	00000000	000000	000000	00	000000	00	00
Closed Duct
18	18"	17 7/8"	24	Crimped	00000000	00000	00	0000000	000000000	0000000	0000000

90° Elbow Connectors

Connectors with welded seams prevent leaks.

						Galvanized Steel		304 Stainless Steel
Duct Size	Female ID	Male OD	Features	End Construction	Gauge		Each		Each
18	18"	17 7/8"	Welded Seams	Tapered	20	00000000	0000000	00000000	0000000

45° Elbow Connectors

45° Elbow Connector with Welded Seams

45° Elbow Connector

Connectors with welded seams prevent leaks.

					Galvanized Steel			304 Stainless Steel
Duct Size	Female ID	Male OD	Features	End Construction	Gauge		Each	Gauge		Each
18	18"	17 7/8"	__	Crimped	24	00000000	0000000	__	000000	00
18	18"	17 7/8"	Welded Seams	Tapered	__	000000	00	20	00000000	0000000

Adjustable-Angle Elbow Connectors, 90° Elbow to Straight

Adjustable-angle elbow connectors can be used at an angle or straight.

					Galvanized Steel
Duct Size	Female ID	Male OD	Gauge	End Construction		Each
18	18"	17 7/8"	24	Crimped	0000000	0000000

Straight Connectors

Straight connectors wrap around two female duct ends to join them.

				Galvanized Steel
Duct Size	Female ID	Gauge	End Construction		Each
18	18"	26	Plain	00000000	000000

Tee Connectors

Female

Female × Female × Male

Tee connectors join or split runs of duct.

					Galvanized Steel		304 Stainless Steel
Duct Size	Female ID	Male OD	Gauge	End Construction		Each		Each
Female
18	18"	__	26	Crimped	00000000	0000000	000000	00
Female × Female × Male
18	18"	17 7/8"	24	Crimped	000000	00	00000000	0000000
18	18"	17 15/16"	24	Crimped	00000000	000000	000000	00

Straight Reducers, Female × Male

Reducers connect duct with different diameters.

Duct Size					Galvanized Steel			304 Stainless Steel
(A)	(B)	Female ID (A)	Male OD (B)	End Construction	Gauge		Each	Gauge		Each
18	14	18"	13 7/8"	Plain	22	00000000	000000	24	00000000	0000000
18	16	18"	15 7/8"	Plain	22	00000000	00000	__	000000	00

Straight Reducers, Male × Female

Reducers connect duct with different diameters.

Duct Size						Galvanized Steel
(A)	(B)	Male OD (A)	Female ID (B)	Gauge	End Construction		Each
20	18	19 15/16"	18"	24	Crimped	00000000	000000

Straight Collars

Female

Collars create branches from a rectangular duct. Cut a hole in the duct and use a collar to attach standard duct.

			Galvanized Steel
Duct Size	Female ID	End Construction	Gauge		Each
Female
18	18"	Plain	28	0000000	000000

End Caps

Female

				Galvanized Steel
Duct Size	Female ID	Gauge	End Construction		Each
Female
18	18"	26	Plain	00000000	000000

Crush-Resistant Spiral Duct and Fittings

A spiral seam makes this duct strong and rigid. Fittings have male ends with a slightly smaller diameter to press-fit into duct.

Galvanized steel has good corrosion resistance. 304 stainless steel is more corrosion resistant than steel.

For technical drawings and 3-D models, click on a part number.

Duct

Add a noise reducer to duct to decrease noise by as much as 50%.

				Galvanized Steel			304 Stainless Steel
Duct Size	Female ID	End Construction	Gauge		2 ft.	5 ft.		2 ft.	5 ft.
18	18"	Plain	24	00000000	000000	0000000	00000000	0000000	0000000

Straight Connectors

Female

Female straight connectors join two fittings.

				Galvanized Steel		304 Stainless Steel
Duct Size	Female ID	End Construction	Gauge		Each		Each
Female
18	18"	Plain	22	00000000	000000	00000000	000000

Automatic Airflow Dampers

Save energy and increase comfort by heating and cooling only the areas that need it. Dampers automatically close when signaled by a thermostat or switch (not included).

For technical drawings and 3-D models, click on a part number.

			Overall							Galvanized Steel
Duct Size	Female ID	Male OD	Ht.	Wd.	Gauge	Electrical Connection Type	Voltage	End Construction	Connection Type		Each
18	18"	17 7/8"	22 1/4"	20"	22	Hardwire	24V AC	Crimped	Press Fit	0000000	0000000

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About Duct Connections

About Duct Hose

Blo-R-Vac Very Flexible Duct Hose for Fumes

Retracting Very Flexible Duct Hose with Wear Strip for Fumes

Blo-R-Vac Flexible Duct Hose for Dust

Abrasion-Resistant Very Flexible Duct Hose for Dust

Very Flexible Duct Hose for Dust

Static-Control Very Flexible Duct Hose for Dust

Continuous-Flex Duct Hose for Wood Chips and Plastic Pellets

Quick-Attach Duct Hose with Wear Strip for Air

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

Easy-Store Duct Hose for Air

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

Blo-N-Vent Duct Hose for Air

Insulated Bend-and-Stay Metal Duct Hose for Air

Quick-Disconnect Duct and Fittings

Standard Duct and Fittings

Crush-Resistant Spiral Duct and Fittings

Automatic Airflow Dampers