What Thermaflex does

Thermaflex manufactures flexible duct products for HVAC applications, serving both commercial mechanical contractors and residential HVAC installers. Founded in 1953 and headquartered in Abbeville, South Carolina, the company operates as a division of Flex-Tek Group, itself a subsidiary of UK-listed conglomerate Smiths Group PLC. Its product portfolio spans three primary lines — Pro Series for commercial applications, EverClean for premium residential, and Flex-Vent for value residential — supplemented by accessories such as the FlexaBoot duct connector. The most recent platform-level addition is the patent-pending Floating Core (FC) insulated flexible duct, launched in April 2018, which redesigns the insulation and packaging to reduce shipping damage and contractor handling time.

Thermaflex operates four US manufacturing facilities (Abbeville SC at approximately 310,000 sq ft as headquarters, Phoenix AZ at 140,000 sq ft, Houston TX, and a fourth site) plus a Canadian distribution center in Mississauga, Ontario. Revenue flows through a two-tier channel: manufacturer representatives selling directly to commercial mechanical contractors, and wholesale distribution serving residential HVAC installers and builders. Commercial specification adoption is reinforced by inclusion in ARCOM MasterSpec, the industry-standard architectural specification platform, and by a dense certification stack including UL 181, NFPA 90A/90B, GREENGUARD, CHPS, ENERGY STAR, and LEED compliance. A 10-year warranty program and a contractor-facing mobile application with product calculators support installer adoption and specification workflows. The company self-positions as the global leader in flexible duct, supported by 70+ years of brand history, though standalone financial metrics are not publicly disclosed.

Name

Thermaflex

Legal name

Thermaflex

Website

https://thermaflex.net

Company type

Private

Founded year

1953

Operating status

Operating

Headcount range

501–1,000 employees

Short description

Thermaflex manufactures flexible HVAC duct products for commercial and residential construction markets, operating as a division of Flex-Tek Group within Smiths Group PLC from four US manufacturing facilities and a Canadian distribution center.

Ownership category

akta.pro rank

Product category

HVAC Flexible Duct Manufacturing

NAICS

Ventilation, Heating, Air-Conditioning, and Commercial Refrigeration Equipment Manufacturing (3334), Warm Air Heating and Air-Conditioning Equipment and Supplies Merchant Wholesalers (42373)

SIC

Air-Cond & Warm Air Heatg Equip & Comm & Indl Refrig Equip (3585), Steam & Air-Conditioning Supply (4961)

akta.pro primary industry

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

akta.pro secondary industries

HVAC, Water Heaters & Indoor Air Quality Distribution (CRAOAFAJ), HVAC Parts & Supplies Retail (Thermostats, Filters, Ducting) (CRAIADAI)

Keywords

• Flexible duct products
• HVAC ductwork manufacturing
• Commercial HVAC ducts
• Residential HVAC ducts
• Flexible air connectors

Headquarters

HQ city

Abbeville

HQ country

United States

HQ region

North America

Offices5 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Personnel, Marketing or Sales, Infrastructure

Revenue model

1. Flexible Duct Hardware Sales: Thermaflex generates revenue through the manufacture and sale of flexible duct products, including insulated and non-insulated ducts, air connectors, and accessories. Products are sold through a network of manufacturer sales representatives and national wholesale distribution outlets serving the commercial and residential HVAC markets.

Go-to-market motion1 record

Distribution channels4 records

Marketing channels7 records

Core offering

Thermaflex manufactures and sells flexible duct products for HVAC applications, including insulated ducts (M-KC, M-KE, G-KM), non-insulated air connectors (S-TL, S-LD, S-LP-10), and value-priced residential lines (EverClean, Flex-Vent). Products are offered in multiple R-values (R-4.2, R-6.0, R-8.0) with antimicrobial and acoustical options and are backed by a 10-year warranty. Manufacturing is conducted across four U.S. facilities (Abbeville SC, Cairo GA, Phoenix AZ, Houston TX) with a Canadian distribution center in Mississauga.

Product overview

Thermaflex is a global leader in the flexible duct product industry for commercial and residential HVAC applications. Founded in 1953 and headquartered in Abbeville, SC, the company offers three main product lines: (1) Thermaflex Pro Series for commercial applications featuring insulated ducts (M-KC, M-KE, G-KM) and non-insulated air connectors (S-TL, S-LD, S-LP-10) backed by a 10-year Pro Warranty; (2) EverClean premium residential duct with antimicrobial properties and R-8 insulation; (3) Flex-Vent value-priced residential products including KM, KP, KPE, R-KD insulated ducts, MC and DV air connectors, and the patent-pending Floating Core (FC). The product portfolio is complemented by accessories including Flexible Duct Assemblies, FlexFlow Elbow, FlexaBoot, FlexTie, Thermasleeve, and Snaplock Clamp. The company operates four manufacturing facilities in the US (Abbeville SC, Cairo GA, Phoenix AZ, Houston TX) and a distribution center in Mississauga, Canada.

Differentiator

Problem solved

Functional benefit

Brands

• EverClean™: Premium flexible duct product line with antimicrobial properties, designed for residential applications with focus on indoor air quality and mold prevention.
• Flex-Vent®
• Pro Series
• Floating Core (FC)

Products and services

• Thermaflex Pro Series Commercial-grade flexible duct line including insulated ducts (M-KC woven fiberglass core, M-KE acoustical CPE core, G-KM thermally efficient CPE core) and non-insulated air connectors (S-TL, S-LD, S-LP-10), backed by a 10-year Pro Warranty for use in commercial HVAC systems.
• EverClean Premium residential flexible duct featuring antimicrobial inner core for mold/mildew resistance, R-8 insulation for energy efficiency, GREENGUARD certification, and noise reduction design for indoor air quality.
• Flex-Vent Complete line of value-priced residential flexible duct products including insulated ducts (KM, KP, KPE, R-KD, Floating Core FC), air connectors (MC), and dryer vent hose (DV), all backed by a 10-year warranty.
• Floating Core (FC) Duct Construction Patent-pending insulated flexible duct construction featuring a wire helix spacer that creates an air gap between a reflective inner core and fiberglass insulation, providing 3x greater crush resistance and 50% smaller packaging versus standard insulated flexible duct.
• Flexible Duct Assemblies Pre-assembled thermally insulated duct connectors in 5- and 7-foot lengths with galvanized fittings, available in 4- to 20-inch diameters with R-values of R-4.2, R-6.0, and R-8.0.
• FlexFlow Elbow Adjustable elbow fitting that forms flexible duct into a highly efficient 90-degree turn for diameters 6-16 inches, providing maximum airflow at a fraction of the cost of galvanized elbows.
• FlexaBoot Return air plenum boot accessory that replaces expensive rectangular internally-lined sheet metal boots at less than half the cost, designed for sound attenuation with 360-degree rotation; UL approved for return air plenum spaces.
• FlexTie Adjustable duct support for 4-16 inch diameters that prevents inner core compression and insulation jacket damage, UL approved for return air plenum spaces.
• Thermasleeve Energy-efficient pipe insulation sleeve in metallized or polyethylene with R-values of R-4.2, R-6.0, and R-8.0 for round sheet metal duct, available in 4- to 18-inch diameters.
• Snaplock Clamp Stainless steel duct clamp with cadmium plated hex bolt available in 6, 8, and 12 inch adjustable diameters for securing flexible duct to metal fittings.
• Duct Calculator Mobile App Mobile application for iPhone and Android that allows HVAC installers to determine optimal flexible duct size based on friction loss and volume calculations.

Quantifiable outcome

• EverClean flexible ducting in conditioned spaces reduces thermal losses, contributing to a home predicted to be 80% more efficient than typical construction (Platinum LEED home project).
• +4 more outcomes

Named customers4 records

Segments2 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

Five partnerships are on record, tiered core and minor.

• ARCOM (MasterSpec)coreGTM or Marketing Partner · 20 July 2016Thermaflex and ARCOM partnered to make Thermaflex's product data and customized specifications available through ARCOM's MasterSpec software platforms, reaching over 60,000 architects, engineers, and design professionals worldwide. Customized versions of industry-trusted MasterSpec sections accurately specify Thermaflex's unique products alongside product catalog and data sheets.
• GastiteminorOthersSister company under the Flex-Tek Group of Smiths Group PLC. Both Thermaflex and Gastite are premier brands within the Construction Group Division, overseen by the same VP and GM.
• Tutco (Tutco Heating Solutions Group)minorOthersSister company under the Flex-Tek Group of Smiths Group PLC. Tutco is the world's leading manufacturer of open coiled heating elements for the HVAC and dryer market.
• Flex-Tek Group (Division of Smiths Group PLC)coreOthersThermaflex is a division of Flex-Tek Group, headquartered in Greenwood, SC, which is a division of London-based Smiths Group PLC. Flex-Tek provides engineered components that heat and move fluids for aerospace, medical, industrial, construction and domestic markets.
• Underwriters Laboratories (UL)coreTechnology or IntegrationAll Thermaflex products are UL Listed under UL 181 standard for Factory-Made Air Ducts and Air Connectors, meeting Class 1 requirements for flame spread and smoke developed ratings.

Scale indicators6 records

Recent moves8 records

Expansion highlights5 records

Direct peers

• Atco Rubber Products: Atco manufactures flexible duct products for HVAC applications, directly competing with Thermaflex in both residential and commercial channels across the North American market.
• JP Lamborn: JP Lamborn (formerly marketed under Lambron) is a US flexible duct manufacturer offering insulated and non-insulated ducts that compete head-to-head with Thermaflex Pro Series and Flex-Vent lines.
• Hart & Cooley: Hart & Cooley produces flexible duct and air distribution products for residential and commercial HVAC, sharing Thermaflex's distribution channels and target contractor base.
• Dundas Jafine: Dundas Jafine manufactures HVAC accessories including dryer vent hoses and flexible duct products, overlapping with Thermaflex's Flex-Vent DV and lower-end residential SKUs at mass retail.
• Imperial: Imperial supplies duct fittings, flexible duct, and HVAC components to contractors and wholesalers in North America, directly comparable to Thermaflex's accessories and duct offerings.

Broad incumbents

• CertainTeed (Saint-Gobain): CertainTeed, part of Saint-Gobain, offers flexible duct alongside a much broader building products portfolio including insulation, ceilings, and gypsum, competing with Thermaflex at the ducting level while leveraging deeper cross-category distribution.

Others

• Gastite (Flex-Tek / Smiths Group): Sister company under the same Flex-Tek / Smiths Group parent, Gastite focuses on gas distribution rather than HVAC ducting but shares corporate overhead, leadership, and customer relationships.
• Owens Corning: Owens Corning supplies the fiberglass insulation (including EcoTouch) used in Thermaflex products, making it a critical upstream supplier and adjacent building-products incumbent.

Emerging players

• Fantech: Fantech specializes in inline fans, duct fans, and ventilation accessories that often pair with flexible duct installations, making it an adjacent comparable in the residential and light-commercial HVAC channel.
• Deflecto: Deflecto produces HVAC and dryer venting products sold through home improvement retail, partially overlapping Thermaflex's residential Flex-Vent DV and accessory SKUs at the consumer end of the channel.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat6 records

Key risks6 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/channel/UCYKsWgwZI0ioOZ72QBgkY1w
• Facebookfacebook.com/thermaflexduct

Compliance14 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 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 Thermaflex