Dryer Duct Fittings | McMaster-Carr

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Duct Size

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Component

Fitting Connection

Quick-Disconnect Clamp

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Gauge

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DFARS Specialty Metals

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Export Control Classification Number (ECCN)

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RoHS

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Duct Construction

Blade Material

Opening Width

Oval Width

Vent Type

Opening Length

Oval Height

405 Products

About Duct Connections

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

Duct

Open Duct

Closed Duct

					Galvanized Steel				Aluminum			304 Stainless Steel
Duct Size	Female ID	Male OD	Gauge	End Construction		2 ft.	4 ft.	5 ft.		2 ft.	5 ft.		2 ft.	5 ft.
Open Duct
3	3"	2 7/8"	26	Crimped	00000000	000000	00	000000	0000000	00	000000	000000	00	00
4	4"	3 7/8"	__	Crimped	000000	00000	00	00000	000000	00	00	000000	00	00
4	4"	3 7/8"	26	Crimped	000000	00	00	00	000000	000000	00000	000000	00	00
5	5"	4 7/8"	24	Crimped	000000	00	00	00	00000000	00	00000	000000	00	00
5	5"	4 7/8"	26	Crimped	000000	00000	00	00000	0000000	00000	00	000000	00	00
6	6"	5 7/8"	26	Crimped	000000	00000	00	00000	00000000	00000	00000	000000	00	00
7	7"	6 7/8"	24	Crimped	000000	00	00	00	00000000	00000	000000	000000	00	00
7	7"	6 7/8"	26	Crimped	000000	00000	00	00000	000000	00	00	00000000	0000000	0000000
8	8"	7 7/8"	24	Crimped	000000	00	00	00	00000000	00000	00	000000	00	00
8	8"	7 7/8"	26	Crimped	000000	00000	00	00000	0000000	00	000000	000000	00	00
9	9"	8 7/8"	26	Crimped	000000	00000	00	00000	000000	00	00	000000	00	00
10	10"	9 7/8"	24	Crimped	000000	00	00	00	00000000	000000	000000	000000	00	00
10	10"	9 7/8"	26	Crimped	000000	00000	00	00000	000000	00	00	00000000	000000	000000
12	12"	11 7/8"	24	Crimped	000000	00	00	00	00000000	000000	000000	000000	00	00
12	12"	11 7/8"	26	Crimped	000000	00000	00	00000	000000	00	00	000000	00	00
14	14"	13 7/8"	24	Crimped	000000	00	00	00	00000000	000000	000000	000000	00	00
14	14"	13 7/8"	26	Crimped	000000	00000	00	00000	000000	00	00	00000000	000000	000000
16	16"	15 7/8"	26	Crimped	00000000	00000	000000	00	000000	00	00	000000	00	00
18	18"	17 7/8"	24	Crimped	00000000	00000	00000	00	000000	00	00	000000	00	00
20	20"	19 7/8"	24	Crimped	00000000	00000	000000	00	000000	00	00	000000	00	00
22	22"	21 7/8"	24	Crimped	0000000	00000	00	00	000000	00	00	000000	00	00
24	24"	23 7/8"	24	Crimped	0000000	00000	00	00	000000	00	00	000000	00	00
Closed Duct
4	4"	3 7/8"	24	Crimped	000000	00	00	00	000000	00	00	000000000	00000	000000
5	5"	4 7/8"	24	Crimped	000000	00	00	00	000000	00	00	0000000	00000	000000
9	9"	8 7/8"	24	Crimped	00000000	00000	00	00000	000000	00	00	000000	00	00
14	14"	13 7/8"	24	Crimped	00000000	00000	00	000000	000000	00	00	000000	00	00
16	16"	15 7/8"	24	Crimped	00000000	00000	00	000000	000000	00	00	000000000	000000	000000
18	18"	17 7/8"	24	Crimped	00000000	00000	00	000000	000000	00	00	000000000	000000	000000
20	20"	19 7/8"	24	Crimped	00000000	00000	00	000000	000000	00	00	000000	00	00
22	22"	21 7/8"	24	Crimped	00000000	00	00	000000	000000	00	00	000000	00	00
24	24"	23 7/8"	24	Crimped	00000000	00	00	000000	000000	00	00	000000	00	00

90° Elbow Connectors

Connectors with welded seams prevent leaks.

Galvanized Steel
Duct Size	Female ID	Male OD	Features	End Construction	Gauge		Each
14	14"	13 7/8"	Welded Seams	Tapered	20	00000000	0000000
16	16"	15 7/8"	Welded Seams	Tapered	20	00000000	000000
18	18"	17 7/8"	Welded Seams	Tapered	20	00000000	000000
20	20"	19 7/8"	Welded Seams	Tapered	20	00000000	000000
22	22"	21 7/8"	Welded Seams	Tapered	20	00000000	000000
24	24"	23 7/8"	Welded Seams	Tapered	20	00000000	000000
Aluminum
3	3"	2 7/8"	Welded Seams	Tapered	20	00000000	000000
5	5"	4 7/8"	Welded Seams	Tapered	20	00000000	000000
7	7"	5 7/8"	Welded Seams	Tapered	20	00000000	000000
10	10"	9 7/8"	Welded Seams	Tapered	20	00000000	000000
12	12"	11 7/8"	Welded Seams	Tapered	20	00000000	000000
14	14"	13 7/8"	Welded Seams	Tapered	20	00000000	000000
304 Stainless Steel
3	3"	2 7/8"	Welded Seams	Tapered	20	00000000	000000
14	14"	13 7/8"	Welded Seams	Tapered	20	00000000	000000
16	16"	15 7/8"	Welded Seams	Tapered	20	00000000	000000
18	18"	17 7/8"	Welded Seams	Tapered	20	00000000	000000
20	20"	19 7/8"	Welded Seams	Tapered	20	00000000	00000000

45° Elbow Connectors

45° Elbow Connector with Welded Seams

45° Elbow Connector

Connectors with welded seams prevent leaks.

Galvanized Steel
Duct Size	Female ID	Male OD	Features	End Construction	Gauge		Each
3	3"	2 7/8"	Welded Seams	Tapered	20	0000000	000000
4	4"	3 7/8"	Welded Seams	Tapered	20	0000000	000000
5	5"	4 7/8"	Welded Seams	Tapered	20	0000000	000000
6	6"	5 7/8"	Welded Seams	Tapered	20	0000000	000000
7	7"	6 7/8"	Welded Seams	Tapered	20	0000000	000000
8	8"	7 7/8"	Welded Seams	Tapered	20	0000000	000000
10	10"	9 7/8"	Welded Seams	Tapered	20	0000000	000000
12	12"	11 7/8"	Welded Seams	Tapered	20	0000000	000000
14	14"	13 7/8"	Welded Seams	Tapered	20	00000000	000000
16	16"	15 7/8"	Welded Seams	Tapered	20	00000000	000000
18	18"	17 7/8"	__	Crimped	24	00000000	000000
20	20"	19 7/8"	__	Crimped	24	00000000	000000
22	22"	21 7/8"	__	Crimped	24	00000000	000000
24	24"	23 7/8"	__	Crimped	24	00000000	000000
Aluminum
3	3"	2 7/8"	Welded Seams	Tapered	20	00000000	000000
5	5"	4 7/8"	Welded Seams	Tapered	20	00000000	000000
7	7"	6 7/8"	Welded Seams	Tapered	20	00000000	000000
10	10"	9 7/8"	Welded Seams	Tapered	20	00000000	000000
12	12"	11 7/8"	Welded Seams	Tapered	20	00000000	000000
14	14"	13 7/8"	Welded Seams	Tapered	20	00000000	000000
304 Stainless Steel
3	3"	2 7/8"	Welded Seams	Tapered	20	00000000	000000
4	4"	3 7/8"	Welded Seams	Tapered	20	00000000	000000
5	5"	4 7/8"	Welded Seams	Tapered	20	00000000	000000
6	6"	5 7/8"	Welded Seams	Tapered	20	00000000	000000
7	7"	6 7/8"	Welded Seams	Tapered	20	00000000	000000
8	8"	7 7/8"	Welded Seams	Tapered	20	00000000	000000
10	10"	9 7/8"	Welded Seams	Tapered	20	00000000	000000
12	12"	11 7/8"	Welded Seams	Tapered	20	00000000	000000
14	14"	13 7/8"	Welded Seams	Tapered	20	00000000	000000
16	16"	15 7/8"	Welded Seams	Tapered	20	00000000	000000
18	18"	17 7/8"	Welded Seams	Tapered	20	00000000	000000
20	20"	19 7/8"	Welded Seams	Tapered	20	00000000	000000

Adjustable-Angle Elbow Connectors, 90° Elbow to Straight

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

					Galvanized Steel		Aluminum		304 Stainless Steel
Duct Size	Female ID	Male OD	Gauge	End Construction		Each		Each		Each
3	3"	2 7/8"	26	Crimped	0000000	000000	0000000	00000	0000000	000000
4	4"	3 7/8"	26	Crimped	0000000	00000	0000000	0000	0000000	00000
5	5"	4 7/8"	26	Crimped	0000000	00000	0000000	00000	0000000	00000
6	6"	5 7/8"	26	Crimped	0000000	00000	0000000	00000	0000000	00000
7	7"	6 7/8"	26	Crimped	0000000	00000	0000000	00000	0000000	00000
8	8"	7 7/8"	26	Crimped	0000000	00000	0000000	00000	0000000	000000
9	9"	8 7/8"	26	Crimped	0000000	00000	000000	00	000000	00
10	10"	9 7/8"	26	Crimped	0000000	00000	0000000	00000	0000000	000000
12	12"	11 7/8"	26	Crimped	0000000	00000	0000000	00000	0000000	000000
14	14"	13 7/8"	24	Crimped	0000000	00000	000000	00	000000	00
16	16"	15 7/8"	24	Crimped	0000000	000000	000000	00	000000	00
18	18"	17 7/8"	24	Crimped	0000000	000000	000000	00	000000	00
20	20"	19 7/8"	24	Crimped	0000000	000000	000000	00	000000	00
24	24"	23 7/8"	24	Crimped	0000000	000000	000000	00	000000	00

Adjustable-Angle Elbow Connectors, 45° Elbow to Straight

45° Elbow Connector

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

					Galvanized Steel
Duct Size	Female ID	Male OD	Gauge	End Construction		Each
3	3"	2 7/8"	26	Crimped	00000000	000000
4	4"	3 7/8"	26	Crimped	00000000	00000
5	5"	4 7/8"	26	Crimped	00000000	00000
6	6"	5 7/8"	26	Crimped	00000000	00000
7	7"	6 7/8"	26	Crimped	00000000	00000
8	8"	7 7/8"	26	Crimped	00000000	00000
9	9"	8 7/8"	26	Crimped	00000000	00000
10	10"	9 7/8"	26	Crimped	00000000	00000
12	12"	11 7/8"	26	Crimped	00000000	00000
14	14"	13 7/8"	24	Crimped	00000000	00000
16	16"	15 7/8"	24	Crimped	00000000	00000

Straight Connectors

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

				Galvanized Steel
Duct Size	Female ID	Gauge	End Construction		Each
3	3"	26	Plain	00000000	000000
4	4"	30	Plain	0000000	00000
5	5"	30	Plain	0000000	00000
6	6"	30	Plain	0000000	00000
7	7"	30	Plain	0000000	00000
8	8"	30	Plain	0000000	00000
10	10"	28	Plain	0000000	00000
12	12"	26	Plain	0000000	00000
14	14"	26	Plain	00000000	00000
16	16"	26	Plain	00000000	00000
18	18"	26	Plain	00000000	00000
20	20"	26	Plain	00000000	00000
22	22"	26	Plain	00000000	00000
24	24"	26	Plain	00000000	00000

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
14	14"	__	26	Crimped	00000000	000000	000000	00
16	16"	__	26	Crimped	00000000	000000	000000	00
18	18"	__	26	Crimped	00000000	000000	000000	00
20	20"	__	26	Crimped	00000000	000000	000000	00
Female × Female × Male
3	3"	2 7/8"	26	Crimped	0000000	00000	000000	00
4	4"	3 7/8"	26	Crimped	0000000	00000	00000000	0000000
5	5"	4 7/8"	26	Crimped	0000000	00000	000000	00
6	6"	5 7/8"	26	Crimped	0000000	00000	0000000	00000
7	7"	6 7/8"	26	Crimped	0000000	00000	000000	00
8	8"	7 7/8"	26	Crimped	00000000	00000	0000000	000000
9	9"	8 7/8"	26	Crimped	00000000	00000	000000	00
10	10"	9 7/8"	24	Crimped	000000	00	00000000	000000
10	10"	9 7/8"	26	Crimped	00000000	00000	000000	00
12	12"	11 7/8"	24	Crimped	000000	00	00000000	000000
12	12"	11 7/8"	26	Crimped	00000000	00000	000000	00
14	14"	13 7/8"	24	Crimped	000000	00	00000000	000000
14	14"	13 15/16"	26	Crimped	00000000	000000	000000	00
16	16"	15 7/8"	24	Crimped	000000	00	00000000	000000
16	16"	15 15/16"	26	Crimped	00000000	000000	000000	00
18	18"	17 7/8"	24	Crimped	000000	00	00000000	000000
18	18"	17 15/16"	24	Crimped	00000000	000000	000000	00
20	20"	19 7/8"	24	Crimped	00000000	000000	00000000	000000
22	22"	21 7/8"	22	Crimped	00000000	000000	000000	00
24	24"	23 7/8"	22	Crimped	00000000	000000	000000	00

Straight Reducers, Female × Male

Reducers connect duct with different diameters.

Duct Size
(A)	(B)	Female ID (A)	Male OD (B)	End Construction	Gauge		Each
Galvanized Steel
4	3	4"	2 15/16"	Crimped	26	0000000	000000
5	4	5"	3 7/8"	Crimped	26	0000000	00000
6	4	6"	3 15/16"	Crimped	26	0000000	00000
6	5	6"	4 7/8"	Crimped	26	0000000	00000
7	6	7"	5 7/8"	Crimped	26	0000000	00000
8	6	8"	5 15/16"	Crimped	26	0000000	00000
8	7	8"	6 7/8"	Crimped	26	0000000	00000
9	8	9"	7 15/16"	Crimped	26	0000000	00000
10	6	10"	5 7/8"	Crimped	26	0000000	00000
10	7	10"	6 7/8"	Crimped	26	0000000	00000
10	8	10"	7 7/8"	Crimped	26	0000000	00000
12	6	12"	5 7/8"	Crimped	26	0000000	00000
12	7	12"	6 7/8"	Crimped	26	0000000	00000
12	8	12"	7 7/8"	Crimped	26	0000000	00000
12	10	12"	9 7/8"	Crimped	26	0000000	00000
14	10	14"	9 7/8"	Plain	22	00000000	00000
14	12	14"	11 7/8"	Plain	22	00000000	00000
16	12	16"	11 7/8"	Plain	22	00000000	00000
16	14	16"	13 7/8"	Plain	22	00000000	00000
18	14	18"	13 7/8"	Plain	22	00000000	00000
18	16	18"	15 7/8"	Plain	22	00000000	00000
20	16	20"	15 7/8"	Plain	24	00000000	000000
22	18	22"	17 7/8"	Plain	24	00000000	000000
24	20	24"	19 7/8"	Plain	24	00000000	000000
Aluminum
4	3	4"	2 7/8"	Plain	24	00000000	00000
6	4	6"	3 7/8"	Crimped	26	0000000	00000
7	4	7"	3 7/8"	Crimped	24	0000000	00000
12	10	12"	9 7/8"	Plain	24	00000000	00000
304 Stainless Steel
4	3	4"	2 7/8"	Crimped	26	0000000	00000
6	4	6"	3 7/8"	Crimped	26	0000000	00000
8	6	8"	5 7/8"	Crimped	26	0000000	00000
12	8	12"	7 7/8"	Plain	24	00000000	000000
14	10	14"	9 7/8"	Plain	24	00000000	000000
16	12	16"	11 7/8"	Plain	24	00000000	000000
18	14	18"	13 7/8"	Plain	24	00000000	000000
20	16	20"	15 7/8"	Plain	24	00000000	000000

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
4	3	3 7/8"	3"	24	Plain	00000000	000000
5	4	4 7/8"	4"	24	Plain	00000000	00000
6	4	5 7/8"	4"	26	Crimped	0000000	00000
7	6	6 7/8"	6"	26	Crimped	0000000	00000
8	6	7 7/8"	6"	26	Crimped	0000000	00000
8	7	7 7/8"	7"	26	Crimped	0000000	00000
10	6	9 7/8"	6"	26	Crimped	0000000	00000
10	8	9 7/8"	8"	26	Crimped	0000000	00000
12	6	11 7/8"	6"	26	Crimped	0000000	00000
12	8	11 7/8"	8"	26	Crimped	0000000	00000
12	10	11 7/8"	10"	26	Crimped	0000000	00000
14	10	13 7/8"	10"	28	Crimped	0000000	00000
14	12	13 7/8"	12"	28	Crimped	0000000	00000
16	12	15 7/8"	12"	26	Crimped	0000000	00000
16	14	15 7/8"	14"	28	Crimped	0000000	00000
18	14	17 7/8"	14"	24	Plain	00000000	00000
18	16	17 7/8"	16"	26	Crimped	0000000	00000
20	18	19 15/16"	18"	24	Crimped	00000000	00000
22	20	21 15/16"	20"	24	Crimped	00000000	00000
24	22	23 15/16"	22"	24	Crimped	00000000	00000

45° Wye Reducers

Female × Male × Male

Male × Female × Female

Reducers connect duct with different diameters.

Duct Size			Female ID			Male OD					Galvanized Steel
(A)	(B)	(C)	(A)	(B)	(C)	(A)	(B)	(C)	Gauge	End Construction		Each
Female × Male × Male
12	10	10	12"	__	__	__	9 7/8"	9 7/8"	28	Crimped	00000000	0000000
14	10	10	14"	__	__	__	9 7/8"	9 7/8"	28	Crimped	00000000	000000
16	12	12	16"	__	__	__	11 7/8"	11 7/8"	26	Crimped	00000000	000000
16	14	14	16"	__	__	__	13 7/8"	13 7/8"	26	Crimped	00000000	000000
Male × Female × Female
4	3	3	__	3"	3"	3 7/8"	__	__	26	Crimped	00000000	00000
5	3	4	__	3"	4"	4 7/8"	__	__	26	Crimped	00000000	00000
5	3	5	__	3"	5"	4 7/8"	__	__	26	Crimped	00000000	00000
6	3	4	__	3"	4"	5 7/8"	__	__	26	Crimped	00000000	00000
6	4	4	__	4"	4"	5 7/8"	__	__	26	Crimped	00000000	00000
6	4	5	__	4"	5"	5 7/8"	__	__	26	Crimped	00000000	00000
7	5	6	__	5"	6"	6 7/8"	__	__	26	Crimped	00000000	00000
8	6	6	__	6"	6"	7 7/8"	__	__	26	Crimped	00000000	00000
10	8	8	__	8"	8"	9 7/8"	__	__	26	Crimped	00000000	000000
12	8	8	__	8"	8"	11 7/8"	__	__	26	Crimped	00000000	000000

Tee Reducers

Female × Male × Male

Reducers connect duct with different diameters.

Duct Size				Male OD				Galvanized Steel
(A)	(B)	(C)	Female ID (A)	(B)	(C)	Gauge	End Construction		Each
Female × Male × Male
4	3	4	4"	2 7/8"	3 7/8"	26	Crimped	00000000	000000
5	3	5	5"	2 7/8"	4 7/8"	26	Crimped	0000000	00000
6	3	6	6"	2 7/8"	5 7/8"	26	Crimped	0000000	00000
6	4	6	6"	3 7/8"	5 7/8"	26	Crimped	0000000	00000
8	6	6	8"	5 7/8"	5 7/8"	24	Plain	00000000	000000
10	8	8	10"	7 7/8"	7 7/8"	24	Plain	00000000	000000
12	8	8	12"	7 7/8"	7 7/8"	24	Plain	00000000	000000

Airflow Dampers, Female × Male

Airflow dampers control airflow through duct.

					Aluminum
Duct Size	Female ID	Male OD	Gauge	End Construction	Blade Material		Each
Standard
3	3"	2 7/8"	26	Crimped	Aluminum	0000000	000000
4	4"	3 7/8"	26	Crimped	Aluminum	0000000	00000
6	6"	5 7/8"	26	Crimped	Aluminum	0000000	00000

Airflow Dampers, Male

Standard

Airflow dampers control airflow through duct.

				Galvanized Steel
Duct Size	Male OD	Gauge	End Construction	Blade Material		Each
Standard
4	3 3/4"	20	Plain	Galvanized Steel	00000000	000000
5	4 3/4"	20	Plain	Galvanized Steel	00000000	00000
6	5 3/4"	20	Plain	Galvanized Steel	00000000	00000
7	6 3/4"	20	Plain	Galvanized Steel	00000000	00000
8	7 3/4"	20	Plain	Galvanized Steel	00000000	000000
9	8 3/4"	20	Plain	Galvanized Steel	00000000	000000
10	9 3/4"	20	Plain	Galvanized Steel	00000000	000000
12	11 3/4"	20	Plain	Galvanized Steel	00000000	000000
14	13 3/4"	20	Plain	Galvanized Steel	00000000	000000
16	15 3/4"	20	Plain	Galvanized Steel	00000000	000000
18	17 3/4"	20	Plain	Galvanized Steel	00000000	000000
20	19 3/4"	18	Plain	Galvanized Steel	00000000	000000
22	21 3/4"	18	Plain	Galvanized Steel	00000000	000000
24	23 3/4"	18	Plain	Galvanized Steel	00000000	000000

Damper Blades

Add damper blades to duct to control airflow.

				Galvanized Steel
Duct Size	Female ID	Gauge	Includes		Each
4	4"	28	Handle	0000000	00000
5	5"	28	Handle	0000000	0000
6	6"	28	Handle	0000000	0000
7	7"	28	Handle	000000	00000
8	8"	28	Handle	0000000	00000
9	9"	26	Handle	0000000	0000
10	10"	26	Handle	0000000	00000
12	12"	26	Handle	0000000	00000
14	14"	24	Handle	0000000	00000

Damper Hardware

Attach damper hardware to a sheet metal blade to create a damper. A threaded mount acts as the pivot.

	Galvanized Steel
For Max. Damper Blade Thick.		Each
0.022"	0000000	00000

Vent Caps

Exhaust Vent

Intake Vent

					Galvanized Steel			Aluminum
Duct Size	Female ID	Male OD	Includes	End Construction	Gauge		Each	Gauge		Each
Exhaust Vent
3	3"	__	Damper	Plain	__	000000	00	30	0000000	000000
4	4"	__	Damper	Plain	30	00000000	000000	30	0000000	00000
5	5"	__	Damper	Plain	30	00000000	00000	__	000000	00
6	6"	__	Damper	Plain	30	00000000	00000	22	0000000	00000
7	7"	__	Damper	Plain	30	00000000	00000	__	000000	00
8	8"	__	Damper	Plain	30	00000000	00000	22	0000000	000000
Intake Vent
4	__	3 7/8"	Screen	Crimped	30	00000000	00000	__	000000	00
5	__	4 7/8"	Screen	Crimped	30	00000000	00000	__	000000	00
6	__	5 7/8"	Screen	Crimped	30	00000000	00000	__	000000	00
7	__	6 7/8"	Screen	Crimped	30	00000000	00000	__	000000	00
8	__	7 7/8"	Screen	Crimped	30	00000000	00000	__	000000	00

90° Elbow Register Boots

		Opening				Galvanized Steel
Duct Size	Female ID	Lg.	Wd.	Gauge	End Construction		Each
6	6"	10"	2 1/4"	30	Plain	0000000	000000
6	6"	10"	4"	30	Plain	0000000	00000
6	6"	12"	2 1/4"	30	Plain	0000000	00000
6	6"	12"	4"	30	Plain	0000000	00000

Straight Register Boots

		Opening				Galvanized Steel
Duct Size	Female ID	Lg.	Wd.	Gauge	End Construction		Each
6	6"	10"	2 1/4"	30	Plain	0000000	000000
6	6"	10"	4"	30	Plain	0000000	00000
6	6"	12"	2 1/4"	30	Plain	0000000	00000
6	6"	12"	4"	30	Plain	0000000	00000

90° Elbow Collars

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	Male OD	Gauge	End Construction		Each
5	4 7/8"	30	Crimped	0000000	000000
6	5 7/8"	30	Crimped	0000000	00000
7	6 7/8"	30	Plain	0000000	00000
8	7 7/8"	30	Plain	0000000	00000

Straight Collars

Female

Male

Male with Gasket

Collars create branches from a rectangular duct. Cut a hole in the duct and use a collar to attach standard duct. Collar with polyethylene gasket is self-sealing because the gasket has an adhesive back. The flange has 1/8" dia. mounting holes.

				Galvanized Steel			Galvanized Steel with Polyethylene Foam Gasket
Duct Size	Female ID	Male OD	End Construction	Gauge		Each	Gauge		Each
Female
3	3"	__	Plain	28	0000000	00000	__	000000	00
4	4"	__	Plain	28	0000000	0000	__	000000	00
5	5"	__	Plain	28	0000000	0000	__	000000	00
6	6"	__	Plain	28	0000000	0000	__	000000	00
8	8"	__	Plain	28	0000000	0000	__	000000	00
10	10"	__	Plain	28	0000000	0000	__	000000	00
12	12"	__	Plain	28	0000000	00000	__	000000	00
14	14"	__	Plain	28	0000000	00000	__	000000	00
16	16"	__	Plain	28	0000000	00000	__	000000	00
18	18"	__	Plain	28	0000000	00000	__	000000	00
20	20"	__	Plain	28	0000000	00000	__	000000	00
Male
3	__	2 7/8"	Crimped	28	0000000	0000	__	000000	00
4	__	3 7/8"	Crimped	28	0000000	0000	__	000000	00
5	__	4 7/8"	Crimped	28	0000000	0000	24	0000000	000000
6	__	5 7/8"	Crimped	28	0000000	0000	24	0000000	00000
7	__	6 7/8"	Crimped	__	000000	00	24	0000000	00000
8	__	7 7/8"	Crimped	28	0000000	0000	24	0000000	00000
10	__	9 7/8"	Crimped	28	0000000	0000	24	0000000	00000
12	__	11 7/8"	Crimped	28	0000000	00000	24	0000000	00000
14	__	13 7/8"	Crimped	28	0000000	00000	24	0000000	00000
16	__	15 7/8"	Crimped	28	0000000	00000	24	0000000	00000
18	__	17 7/8"	Crimped	28	0000000	00000	24	0000000	00000
20	__	19 7/8"	Crimped	28	0000000	00000	__	000000	00

Downdraft Diverters

Downdraft diverters have an internal cone that prevents drafts from extinguishing pilot lights.

					Galvanized Steel
Duct Size	Female ID	Male OD	Gauge	End Construction		Each
3	3"	2 7/8"	26	Crimped	0000000	000000
4	4"	3 7/8"	26	Crimped	0000000	00000
5	5"	4 7/8"	26	Crimped	0000000	00000
6	6"	5 7/8"	26	Crimped	0000000	00000
7	7"	6 7/8"	26	Crimped	0000000	00000
8	8"	7 7/8"	26	Crimped	0000000	000000
10	10"	9 7/8"	24	Crimped	0000000	000000
12	12"	11 7/8"	24	Crimped	0000000	000000

Ball Joints

Ball joints create adjustable-angle connections. They are often used to connect duct to duct hose. Hold duct hose in place with a hose clamp (not included).

					Galvanized Steel
Duct Size	Female ID	Male OD	Gauge	End Construction		Each
3	3"	2 7/8"	20	Plain	0000000	0000000
4	4"	3 7/8"	20	Plain	0000000	000000
5	5"	4 7/8"	20	Plain	0000000	000000
6	6"	5 7/8"	20	Plain	0000000	000000
8	8"	7 7/8"	18	Plain	0000000	000000
10	10"	9 7/8"	18	Plain	0000000	000000

Rain Caps

Galvanized Steel

			Galvanized Steel
Duct Size	Female ID	End Construction	Gauge		Each
3	3"	Plain	26	0000000	000000
4	4"	Plain	26	0000000	00000
5	5"	Plain	26	0000000	00000
6	6"	Plain	26	0000000	00000
7	7"	Plain	26	0000000	00000
8	8"	Plain	26	0000000	00000
9	9"	Plain	26	0000000	00000
10	10"	Plain	26	0000000	00000
12	12"	Plain	26	0000000	00000

End Caps

Female

Male

					Galvanized Steel
Duct Size	Female ID	Male OD	Gauge	End Construction		Each
Female
3	3"	__	26	Plain	00000000	00000
4	4"	__	26	Plain	00000000	0000
5	5"	__	26	Plain	00000000	0000
6	6"	__	26	Plain	00000000	0000
7	7"	__	26	Plain	00000000	00000
8	8"	__	26	Plain	00000000	00000
9	9"	__	26	Plain	00000000	00000
10	10"	__	26	Plain	00000000	00000
12	12"	__	26	Plain	00000000	00000
14	14"	__	26	Plain	00000000	00000
16	16"	__	26	Plain	00000000	00000
18	18"	__	26	Plain	00000000	00000
20	20"	__	24	Plain	00000000	00000
22	22"	__	24	Plain	00000000	00000
24	24"	__	24	Plain	00000000	00000
Male
3	__	2 7/8"	26	Crimped	00000000	0000
4	__	3 7/8"	26	Crimped	00000000	0000
5	__	4 7/8"	26	Crimped	00000000	0000
6	__	5 7/8"	26	Crimped	00000000	0000
7	__	6 7/8"	26	Crimped	00000000	00000
8	__	7 7/8"	26	Crimped	00000000	00000
9	__	8 15/16"	26	Crimped	00000000	00000
10	__	9 7/8"	26	Crimped	00000000	00000
12	__	11 7/8"	26	Crimped	00000000	00000
14	__	13 7/8"	26	Crimped	00000000	00000
16	__	15 7/8"	26	Crimped	00000000	00000
18	__	17 7/8"	24	Crimped	00000000	00000
20	__	19 7/8"	24	Crimped	00000000	00000
22	__	21 7/8"	24	Crimped	00000000	00000
24	__	23 7/8"	24	Crimped	00000000	00000

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. 304 stainless steel is the most corrosion resistant.

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

End Caps

				Galvanized Steel		304 Stainless Steel
Duct Size	ID	Gauge	End Construction		Each		Each
3	2 7/8"	18	Rolled	00000000	000000	000000	00
3	3 1/16"	22	Rolled	000000	00	00000000	000000
18	17 7/8"	20	Rolled	00000000	00000	000000	00
18	17 15/16"	20	Rolled	000000	00	00000000	000000
20	19 7/8"	20	Rolled	00000000	00000	000000	00
20	19 15/16"	20	Rolled	000000	00	00000000	000000
22	21 7/8"	20	Rolled	00000000	00000	000000	00
24	23 7/8"	20	Rolled	00000000	00000	000000	00

Oval Duct and Fittings

At about half the height, this oval duct fits in tighter spaces than round and rectangular duct. Duct and fittings press-fit together.

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

Duct

	Female End		Male End					Galvanized Steel
Duct Size	Oval Wd.	Oval Ht.	Oval Wd.	Oval Ht.	Lg., ft.	Gauge	End Construction		Each
6	7 1/2"	3 1/4"	7 3/8"	3 1/8"	5	30	Crimped	0000000	000000
7	9 1/8"	3 3/4"	9"	3 5/8"	5	30	Crimped	0000000	00000
8	10 7/8"	3 1/2"	10 3/4"	3 3/8"	8	30	Crimped	0000000	00000

90° Elbow Connectors

	Female End		Male End				Galvanized Steel
Duct Size	Oval Wd.	Oval Ht.	Oval Wd.	Oval Ht.	Gauge	End Construction		Each
6	7 1/2"	3 1/4"	7 3/8"	3 1/8"	30	Crimped	0000000	00000
7	9 1/8"	3 3/4"	9"	3 5/8"	30	Crimped	0000000	00000
8	10 7/8"	3 1/2"	10 5/8"	3 3/8"	30	Crimped	0000000	00000

90° Elbow Adapters

	Female End					Galvanized Steel
Duct Size	Oval Wd.	Oval Ht.	Female Round End ID	Gauge	End Construction		Each
6	7 1/2"	3 1/4"	6"	30	Plain	0000000	000000
7	9 1/8"	3 3/4"	7"	30	Plain	0000000	00000
8	10 7/8"	3 1/2"	8"	30	Plain	0000000	00000

90° Elbow Register Boots

	Female End		Opening				Galvanized Steel
Duct Size	Oval Wd.	Oval Ht.	Wd.	Lg.	Gauge	End Construction		Each
6	7 1/2"	3 1/4"	4"	10"	28	Plain	0000000	000000
7	9 1/8"	3 3/4"	4"	10"	28	Plain	0000000	00000

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About Duct Connections

Standard Duct and Fittings

Quick-Disconnect Duct and Fittings

Oval Duct and Fittings