Manufacturing of sheet metal air-conditioning ducts (including dust collection ducts), stove pipe, furnace smoke pipe, and elbows

Facility	City	State	Employees	Status
Kennametal INC.	Rogers	AR	—	● ACTIVE
Kennedy INC	North Kingstown	RI	—	● ACTIVE
Kinney Manufacturing LLC	Lincoln	NE	100–499	● ACTIVE
Klune Industries INC	North Hollywood	CA	100–499	● ACTIVE
Knoxville Sheet Metal Works, INC	Knoxville	TN	20–99	● ACTIVE
Kochek Company, LLC	Putnam	CT	20–99	● ACTIVE
Komline-sanderson Group, INC.	Peapack	NJ	100–499	● ACTIVE
Ksm Industries INC	Germantown	WI	20–99	● ACTIVE
Laclede Chain Manufacturing Company, LLC	Fenton	MO	1–19	● ACTIVE
Lancaster Metals Science CORP	Lancaster	PA	20–99	● ACTIVE
Landscape Structures INC	Delano	MN	500+	● ACTIVE
Latitude CORP.	Verona	WI	100–499	● ACTIVE
Lebus International, INC.	Longview	TX	20–99	● ACTIVE
Lewco INC	Sandusky	OH	500+	● ACTIVE
Little Falls Machine INC	Little Falls	MN	20–99	● ACTIVE
Lockheed Martin Aeroparts, INC.	Johnstown	PA	500+	● ACTIVE
Lowell Manufacturing Company	Pacific	MO	20–99	● ACTIVE
Machinists, INC.	Seattle	WA	100–499	● ACTIVE
Marathon Cutting Die INC	Wheeling	IL	20–99	● ACTIVE
Marco Group, INC.	Neosho	MO	20–99	● ACTIVE
Marine Travelift INC	Sturgeon Bay	WI	100–499	● ACTIVE
Martin International Enclosures, LLC	Seabrook	NH	—	● ACTIVE
Mbs Fabrication, INC.	Southbridge	MA	20–99	● ACTIVE
M-d Building Products, INC.	Oklahoma City	OK	500+	● ACTIVE
Mech Tronics CORP	Melrose Park	IL	20–99	● ACTIVE
MCMeco CORP	Greeneville	TN	100–499	● ACTIVE
Mersen USA Ptt CORP	Boonton	NJ	100–499	● ACTIVE
MCMetal Components LLC	Grand Rapids	MI	—	● ACTIVE
Metal Forms Corporation	Milwaukee	WI	20–99	● ACTIVE
Metallics INC	Onalaska	WI	100–499	● ACTIVE
Metalworks INC	Ludington	MI	100–499	● ACTIVE
Metglas, INC	Conway	SC	100–499	● ACTIVE
Mid State Machine Products	Winslow	ME	100–499	● ACTIVE
Midwest Metal Products CO	Cedar Rapids	IA	20–99	● ACTIVE
Miller Marine LLC	San Diego	CA	20–99	● ACTIVE
Mk Magnetics, INC.	Adelanto	CA	20–99	● ACTIVE
Modern Metal Solutions, LLC	Hudson	NH	20–99	● ACTIVE
Modine Grenada LLC	Grenada	MS	—	● ACTIVE
Morgan Metals INC	Athens	AL	—	● ACTIVE
Nelson Irrigation Corporation	Walla Walla	WA	100–499	● ACTIVE
New Age Metal Fabricating CO INC	Fairfield	NJ	20–99	● ACTIVE
Northeast Industrial Manufacturing, INC.	Greenville	PA	20–99	● ACTIVE
Northern Gear, LLC	Muskego	WI	20–99	● ACTIVE
Nrd LLC	Grand Island	NY	20–99	● ACTIVE
Oem Fabricators, INC.	Woodville	WI	100–499	● ACTIVE
Oetiker, INC	Marlette	MI	100–499	● ACTIVE
Ohio Gratings, INC.	Canton	OH	500+	● ACTIVE
Olympic Industries, LLC	Cordova	TN	20–99	● ACTIVE
Pacific Aerospace & Electronics, LLC	Wenatchee	WA	100–499	● ACTIVE
Pacific Stair CO.	Salem	OR	20–99	● ACTIVE

FactoryRegistry lists 10,034 facilities whose primary industry classification is one of the 3 industries above. This is a list by industry, not a list of makers: Census reports that establishments in these industries produced sheet metal air-conditioning ducts (including dust collection ducts), stove pipe, furnace smoke pipe, and elbows, in the shares shown above, and does not say which establishments. Where a plant’s own website or a federal registry names what that plant makes, it appears on the plant’s own page with the source named.

The U.S. Census Bureau recorded this product line in 3 US manufacturing industries in the 2022 Economic Census, as the most specific line those industries reported. At least 667 establishments reported producing it; the count for 1 of those industries was withheld.

These are counts of establishments by industry: the Economic Census publishes them as industry totals and never as a list of plants.

NAPCS collection code 2038675000. Source for the product line, the establishment counts and the shares: U.S. Census Bureau, 2022 Economic Census (ECNNAPCSIND2022). Federal source data is public domain. Facility records are compiled separately by FactoryRegistry and carry their own sources.