What Ductmate Industries does

Ductmate Industries, founded in 1978 by Peter J. Arnoldt in Charleroi, Pennsylvania, manufactures proprietary HVAC duct connection, sealing, insulation, and accessory systems for commercial and industrial construction. Its flagship product lines are the DM 25/35/45 self-sealing rectangular duct connector system and the Spiralmate round duct connector system, both designed to deliver airtight seals without welding; the portfolio is rounded out with PolyArmor polyester duct liner insulation, PROseal water-based sealants and sprays, Cable Shark cable hanging systems with built-in load indicators, ULtimate UL 1978-listed grease duct access doors, gaskets and butyl tapes, and installation tools such as the Repeater4200 pneumatic fastener and Cornermatic Strap-Pak corners. The company's products are sold exclusively through a selective distribution network of over 350 US distributor locations plus international distributors, never direct to end customers; it does not publish pricing and operates three SMART-union manufacturing facilities in Pennsylvania, California, and Oklahoma under the DMI Companies umbrella alongside subsidiaries Aire Technologies, GreenSeam Ind, Li-Hvac, and Airoverse.

The company monetizes through hardware sales to its distributor channel, supported by Ductmate University training, technical resources (spec sheets, BIM models, installation videos), and a monthly newsletter/digital content program. Customer segments are horizontal - HVAC distributors, sheet metal and HVAC contractors, mechanical engineers and architects, sheet metal fabricators, and OEM manufacturers - served by named case-study projects across sports and entertainment (UBS Arena), municipal infrastructure (LA Metro Crenshaw/LAX, North Shore Marine Transfer Station), food processing (Schreiber Foods), healthcare (Wexner Medical Center, Prairie Lakes Wellness Center), and education (Indiana University of PA, Gateway Community College). The portfolio carries UL 1978, UL 181B-M, UL 723, GREENGUARD Gold, NFPA 90A/90B/96, LEED, SMACNA Chapter 4, and ICC ESR-2224 certifications, with the DeMI customer platform launched in 2025 consolidating digital access across the DMI Companies portfolio.

Ductmate is privately held, has 101-250 employees, and has been the largest HVAC accessories manufacturer in North America for over 40 years; revenue is not publicly disclosed and the firm has no recorded funding rounds, M&A, or recent leadership turnover, with COO Doug Gudenburr representing internal leadership continuity from the founding generation.

Name

Ductmate Industries

Legal name

DMI Companies

Website

https://ductmate.com

Company type

Private

Founded year

1978

Operating status

Operating

Headcount range

101–250 employees

Short description

Ductmate Industries, founded 1978 and headquartered in Charleroi, Pennsylvania, is a privately held manufacturer of proprietary HVAC duct connection, sealing, insulation, and accessory systems sold exclusively through 350+ US and international distributors serving commercial and industrial contractors, engineers, fabricators, and OEMs.

Ownership category

akta.pro rank

Product category

HVAC Ductwork Components and Accessories

NAICS

Ventilation, Heating, Air-Conditioning, and Commercial Refrigeration Equipment Manufacturing (33341), Warm Air Heating and Air-Conditioning Equipment and Supplies Merchant Wholesalers (42373), Adhesive Manufacturing (32552)

SIC

Gaskets, Packg & Sealg Devices & Rubber & Plastics Hose (3050), Adhesives & Sealants (2891)

akta.pro primary industry

Ventilation, Ducting & Air Distribution Equipment (IMAHAKAG)

akta.pro secondary industry

Ductwork, Duct Fittings & Air Distribution (Diffusers/Grilles/Registers) (IMADANAC)

Keywords

• HVAC duct connectors
• HVAC duct sealants
• Duct liner insulation
• Cable hanging systems
• Grease duct access doors

Headquarters

HQ city

Charleroi

HQ country

United States

HQ region

North America

Offices4 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Personnel, Operations, Marketing or Sales, Technology or R&D, Infrastructure

Revenue model

1. HVAC Duct Component Sales: Ductmate Industries generates revenue through the sale of proprietary HVAC duct components and accessories including duct connector systems, sealants, adhesives, gaskets, access doors, insulation, and hanging systems. Products are sold through a selective distribution network of over 350 distributor locations in the US plus international distributors. The company operates manufacturing facilities in Pennsylvania, California, and Oklahoma.
2. Specialty Product Sales: Sale of specialty duct products including PolyArmor insulation, Gecko Glue adhesives, PROseal sealants, and proprietary connection systems. Products are manufactured with union labor at SMART Local facilities and sold to distributors who serve contractors, engineers, and fabricators.

Go-to-market motion2 records

Distribution channels2 records

Marketing channels10 records

Core offering

Ductmate Industries manufactures and sells proprietary HVAC ductwork components and accessories, including self-sealing rectangular and round duct connector systems, duct sealants and adhesives, gasket tapes, duct liner insulation, cable hanging systems, and grease duct access doors. Products are manufactured at three union facilities in Pennsylvania, California, and Oklahoma, and sold through a selective network of more than 350 US distributors and international distributors serving commercial, industrial, and institutional HVAC projects.

Product overview

Ductmate Industries is a manufacturer of HVAC components and accessories organized around a portfolio of proprietary duct connector systems, sealants, adhesives, gaskets, access doors, insulation, and installation tools. The core product lines include the DM '25'/'35'/'45'® Self-Sealing Rectangular Duct Connector System (the company's original flagship product line) and the Spiralmate® Round Duct Connector System, both designed for quick, airtight duct connections in commercial and industrial HVAC applications. Supporting product categories include: PolyArmor™ polyester duct liner insulation; PROseal® premium water-based duct sealants (including spray variants); gaskets including DM 440™ Butyl Gasket Tape, Neoprene Gasket Tape, and Sticky Tape; access doors including the ULtimate™ UL 1978 listed grease duct doors and Sandwich® access doors; Cable Shark® cable hanging systems with load indicators; TDC/TDF components including Cornermatic® and CORNERMATE® corners and Versa-Cleat®; and time-saving installation tools such as the Repeater4200 pneumatic fastener and Alignment Tool. Ductmate products are manufactured at three union facilities in Pennsylvania, Oklahoma, and California, and distributed through over 350 locations across the US as a selective distribution network.

Differentiator

Problem solved

Functional benefit

Brands

• DeMI: Digital platform that replaced my.Ductmate, providing access to related resources for customers
• PolyArmor
• PROseal
• Spiralmate
• Rapidmate
• Cable Shark
• ULtimate Door
• Cornermatic
• Gecko Glue
• Sandwich Access Doors
• WDCI J&H

Products and services

• DM '25'/'35'/'45' Self-Sealing Rectangular Duct Connector System Industry-leading self-sealing rectangular flange connector system for commercial and industrial HVAC ductwork with integral mastic for airtight sealing and a four-bolt design with optional bolt-on or snap-on cleats that replaces traditional labor-intensive companion angle flanges without welding.
• Spiralmate Round Duct Connector System Self-sealing round duct connector system with one-bolt closure band and integrated sealing mastic in the flange pocket that eliminates manual sealant application during assembly of spiral ductwork. Available in narrow-profile Spiralmate and wider Ventmate for large-diameter duct and misaligned runs.
• PROseal Duct Sealant Premium water-based duct sealant for sealing metal and metal joints against air leaks in low, medium, and high-pressure duct systems up to 15 inches WG, UL GREENGUARD GOLD Certified, UL 181B-M Listed, and UL 723 Classified.
• PROseal Spray Duct Sealant Premium water-based, high-velocity duct sealant sprayable using commercial-grade paint sprayers, shortening application time by 50% compared to manual application.
• FIBERseal Duct Sealant Premium-grade water-based duct sealant containing fiber, capable of sealing ductwork up to 15 inches WG, with LEED compliance and excellent adhesion and flexibility.
• EVERseal Duct Sealant Economy-grade water-based duct sealant sealing ductwork up to 15 inches WG, LEED compliant with no fiber content.
• EZ-Seal Duct Sealant Economy-grade water-based duct sealant containing fiber for sealing ductwork up to 15 inches WG with LEED compliance.
• SOLVseal Duct Sealant Solvent-based duct sealant for applications requiring solvent-based formulations, with a low-VOC option available.
• PolyArmor Polyester Duct Liner Insulation Polyester-based duct liner insulation for forced-air HVAC systems with R-values up to R-12 (3-inch thickness), 0.65 NRC noise reduction, made from 25% recycled material with zero VOCs and no mold or mildew promotion.
• Cable Shark Cable Hanging System Next-generation cable hanging system for commercial HVAC ductwork with built-in load indicators and a dual-purpose engagement/release tool; CS125 rated to 125 lbs and CS250 rated to 250 lbs.
• ULtimate Door UL 1978 listed sandwich-style grease duct access door providing life safety protection, available in 11-gauge 304 stainless steel or black iron, dramatically reducing installation time.
• ULtimate Door II Weld-on style UL 1978 listed grease duct access door for applications requiring UL 1978 listing, designed for fire and life safety challenges.
• ULtimate Door Round UL 1978 listed sandwich-style round access door for grease duct and high-temperature applications, manufactured to exact diameter tolerances for a tight seal, NFPA 96 compliant.
• F2 Grease Duct Sandwich Access Door Grease duct access door meeting NFPA 96 with ceramic fiber gasket rated for use up to 2300°F, requiring no frame installation or special tools, listed in ICC ESR-2224.
• F1 Hi-Temp Sandwich Access Door High-temperature duct access door with fiberglass rope gasket for temperatures up to 1000°F, providing easy access for inspection and maintenance.
• DM 440 Butyl Gasket Tape High-quality HVAC butyl gasket sealing tape for use with Ductmate four-bolt connection systems, featuring the widest application temperature range on the market, LEED compliance, USDA acceptability, and an EPA-registered biocide package.
• Neoprene Gasket Tape Synthetic closed-cell rubber-based duct sealing tape for round and flat oval ductwork, with pressure-sensitive adhesive backing for quick installation and clean removal without residue.
• Sticky Tape High-quality general-use duct sealing tape for TDC and TDF roll-formed flange systems with non-hardening sealant, excellent adhesion, hydrophobic water resistance, and -40°F to 190°F service temperature; USDA acceptable.
• WDCI J&H Duct Connector System Roll-formed flange system for connecting rectangular ducts with rigid, leak-free connections, including flanges, corner pieces, gasket, bolts, nuts, and cleat with integral mastic for self-sealing.
• Cornermatic Strap-Pak Corners Corner packaging system that reloads at least three times faster than traditional corner packaging, reducing loading and lost production time in TDC/TDF fabrication lines.
• Cornermatic Corners Corners manufactured for use in automated corner inserts for transverse duct connections, eliminating jamming and designed for use with Corner Cadet and Cornermatic Corner Inserter.
• Rapidmate Corners Most advanced labor-saving corner system in the Ductmate line with rapid loading and rapid connections for cost savings on rectangular duct connector installations.
• Versa-Cleat Snap-on cleat for use with TDC connections along with Ductmate 35 and Ductmate 45, with a unique design that allows use on most rectangular flange connections.
• Bolt-On Cleat Universal flange clamp alternative to traditional cleats, usable with DM 25, DM 35, DM 45, WDCI J, WDCI H, and TDC/TDF flange profiles, stamped from 11-gauge galvanized steel.
• Ductmate Repeater4200 Pneumatic fastener for fastening slide-on flange to ductwork, lightweight with sequential trigger mechanism for accurate fastener placement and helical gripshank fasteners.
• Ductmate Alignment Tool Tool to quickly align and compress mating ductwork using Ductmate corner holes, allowing fast and easy installation of patented corner clips.
• Gecko Glue Concentrate Duct Liner Adhesive Patented duct liner adhesive concentrate in 54-gallon mix format, mixed on demand by adding water with a custom-made vortex mixer docking station system.
• Quick-Stick CA Cylinder Adhesive Cylinder-format duct liner adhesive for easy application, offered as the Quick-Stick CA canister from the adhesives product line.

Named customers8 records

Segments5 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature8 records

Partnerships

Eight partnerships are on record, tiered core and minor.

• MacArthur Co.coreChannel Partner/ Reseller/ DistributorLong-standing Ductmate distributor based in Sioux Falls. Distributor for multiple Ductmate products including Spiralmate and PolyArmor in the Sioux Falls region.
• Triple S Air SystemscoreChannel Partner/ Reseller/ DistributorLong Island-based sheet metal contractor and Ductmate product user. Successfully installed large-diameter Spiralmate and Ventmate systems at UBS Arena (643 three-piece systems, 752 inner rings). Previously used Ductmate products at Arthur Ashe Stadium enclosure project.
• Southern Tier Custom FabricationcoreChannel Partner/ Reseller/ DistributorSpiral duct manufacturer from Elmira, New York. Loyal Ductmate customer for approximately 30 years, especially Spiralmate round duct connector system. Supplied stainless steel spiral duct for North Shore Marine Transfer Station project.
• Delta Sheet Metal Corporation (PJ Mechanical)minorChannel Partner/ Reseller/ DistributorSheet metal contractor (part of PJ Mechanical founded in 1971) that installed Spiralmate duct at North Shore Marine Transfer Station project. Serves greater New York City real estate market.
• F. Ahern Co. / J.F. AherncoreChannel Partner/ Reseller/ DistributorMechanical contractor for Schreiber Foods headquarters project. Long history working with Ductmate, specifying access doors, connectors, and vane systems. Substituted specified polyimide foam with PolyArmor liner material, achieving 30% installation time savings.
• American Modular Systems (AMS)minorStrategic or Co-development PartnerPartnered with Ductmate to build Gen7 Concept House at River Vine Vineyards in Lodi Wine Country. Project designed for LEED Platinum certification with Zero Net Energy building using renewable energy systems and environmentally friendly materials.
• SMART (International Association of Sheet Metal, Air, Rail and Transportation Workers)coreStrategic or Co-development PartnerAll three Ductmate manufacturing facilities are proud members of SMART Local unions: Monongahela, PA (Local 12), Wagoner, OK (Local 270), Lodi, CA (Local 104). Products like PROseal manufactured by SMART Local 12. Union membership for over 40 years.
• Bay Insulation/CWCIcoreChannel Partner/ Reseller/ DistributorJust-in-time delivery and service provider for Ductmate 45 components on LA Metro Crenshaw/LAX Transit Station project.

Scale indicators4 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• Greenheck Fan Corporation: One of North America's largest manufacturers of air movement, control, and conditioning equipment, including fans, dampers, louvers, and related HVAC accessories. Comparable to Ductmate as a broad HVAC component OEM serving contractors and distributors, though Greenheck spans a much larger product portfolio than Ductmate's duct-accessories focus.
• Ruskin Company: Long-established manufacturer of HVAC air control products including dampers, louvers, and air-handling accessories for commercial and industrial systems. Comparable to Ductmate as a specified-component HVAC accessory brand serving engineers and contractors, though Ruskin's core focus is dampers and air control versus Ductmate's duct connection and sealing focus.
• CaptiveAire Systems: Leading manufacturer of commercial kitchen ventilation systems and related HVAC components, selling through a national direct sales and distribution network. Comparable to Ductmate as a commercial HVAC component manufacturer with strong specification presence, though CaptiveAire is more concentrated in foodservice ventilation.

Direct peers

• Tjernlund Products: Manufacturer of HVAC accessories including duct-related components, draft inducers, and specialty ventilation products sold through distributors to contractors. Comparable to Ductmate as a niche HVAC accessories manufacturer with similar distributor-led GTM and contractor end users.
• Lindy Industries: Manufacturer of sheet metal products and HVAC ductwork components for commercial and industrial applications. Comparable to Ductmate as a directly competing supplier of duct-related components and accessories to contractors and fabricators.
• Hart & Cooley: Manufacturer of HVAC products including registers, grilles, diffusers, and duct system components sold through HVAC distributors. Comparable to Ductmate as a competing HVAC duct accessories brand targeting the same contractor and distributor channel.
• Imperial Manufacturing Group: Manufacturer of HVAC components including duct fittings, venting products, and accessories distributed through wholesale channels to contractors. Comparable to Ductmate as a competing HVAC duct accessories manufacturer with overlapping product categories in fittings, sealants, and related installation components.

Market position

Strengths1 record

Weaknesses5 records

Competitive moat6 records

Key risks5 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/@DuctmateIndustries
• Facebookfacebook.com/ductmateind
• LinkedInlinkedin.com/company/ductmate-industries
• Instagraminstagram.com/ductmate_industries

Compliance10 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 records

Subsidiaries4 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Ductmate Industries