Duro Dyne

What Duro Dyne does

Duro Dyne is a U.S.-based manufacturer and distributor of HVAC air distribution and duct fabrication components, founded in 1952 and headquartered in Bay Shore, New York. The company operates a dual-brand portfolio: the Duro Dyne brand covers duct assembly hardware, flexible duct connectors, access doors, volume dampers, fire/smoke dampers, zone control systems, and duct fabrication machinery; the Supco brand covers HVACR test instruments (including temperature and pressure chart recorders), capacitors, controls, motors, fittings, refrigeration parts, and appliance replacement parts. Together the catalog spans air distribution, duct fabrication, HVACR repair, test instrumentation, and installation consumables, serving HVAC technicians, duct fabricators, and commercial refrigeration service contractors across North America.

Duro Dyne generates revenue through B2B hardware sales via its e-commerce storefront at durodyne.com, dedicated phone order lines, and a network of HVAC distributors. Following its October 2025 acquisition by Lennox International (NYSE: LII) for approximately $550 million as part of NSI Industries' HVAC division, the company now also distributes through Lennox's commercial parts network, the LennoxPros digital platform, and a new 763,000 square foot Regional Distribution Center in Edgerton, Kansas. The acquisition converts a long-tenured independent parts platform into a brand within a public-company HVAC OEM's aftermarket parts strategy.

Name

Duro Dyne

Legal name

Durodyne

Website

https://durodyne.com

Company type

Private

Founded year

1952

Operating status

Operating

Headcount range

101–250 employees

Short description

Duro Dyne is a U.S.-based manufacturer and distributor of HVAC air distribution, duct fabrication, and HVACR repair parts and tools, sold under the Duro Dyne and Supco brands to HVAC technicians, duct fabricators, and commercial refrigeration service contractors across North America.

Ownership category

akta.pro rank

Product category

HVAC Parts and Supplies Distribution

NAICS

Industrial and Commercial Fan and Blower and Air Purification Equipment Manufacturing (333413), Ventilation, Heating, Air-Conditioning, and Commercial Refrigeration Equipment Manufacturing (33341), Automatic Environmental Control Manufacturing for Residential, Commercial, and Appliance Use (334512), Electrical Equipment Manufacturing (33531)

SIC

Industrial & Commercial Fans & Blowers & Air Purifing Equip (3564), Air-Cond & Warm Air Heatg Equip & Comm & Indl Refrig Equip (3585)

akta.pro primary industry

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

akta.pro secondary industries

Ventilation, Ducting & Air Distribution Equipment (IMAHAKAG), HVAC Equipment (Heating, Cooling & Air Handling) (IMAHAKAB), Compressors, Refrigeration Components & Condensing Units (IMADANAG)

Keywords

• HVAC parts distribution
• Duct fabrication components
• Air distribution products
• HVACR test instruments
• Commercial refrigeration supplies

Headquarters

HQ city

Bay Shore

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. HVAC Parts and Supplies Distribution: Duro Dyne generates revenue through the sale of HVAC parts, supplies, and tools. The company sells air distribution components, duct fabrication materials, HVACR tools and test instruments, and installation supplies to HVAC technicians and fabricators. Following its acquisition by Lennox International for approximately $550 million, Duro Dyne operates as a brand platform within Lennox's expanded commercial parts availability strategy.

Go-to-market motion1 record

Distribution channels2 records

Marketing channels3 records

Core offering

Duro Dyne manufactures and distributes HVAC air distribution and duct fabrication components under the Duro Dyne brand, and HVAC/R repair tools, test instruments, and replacement parts under the Supco brand. The product portfolio includes volume dampers, access doors, fire dampers, flexible duct connectors, duct assembly hardware, chart recorders, sensors, capacitors, motors, fasteners, and installation supplies for HVAC technicians and fabricators serving residential and commercial markets.

Product overview

Duro Dyne is an HVAC distribution company operating as part of NSI Industries, offering a comprehensive portfolio of HVAC products under two main brands: Duro Dyne (duct fabrication and air distribution) and Supco (HVAC and refrigeration repair). The product portfolio includes duct fabrication components (cleats, flanges, flexible connectors, machinery), air distribution products (access doors, fire dampers, volume dampers, zone control), HVAC/R components (electrical parts, capacitors, motors, valves), installation supplies (fasteners, clamps, ties, chemicals), HVACR testing tools (chart recorders, sensors, test instruments), and appliance replacement parts. The company serves HVAC technicians and fabricators with time-saving, dependable products for residential and commercial markets.

Differentiator

Problem solved

Functional benefit

Brands

• Duro Dyne: Duct fabrication and air distribution products for HVAC technicians and fabricators
• Supco

Products and services

• Air Distribution Products

Quantifiable outcome

• Duro Dyne and Supco acquisitions expanded Lennox's commercial parts availability significantly

Named customers3 records

Segments1 record

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

One partnership is on record.

• Lennox InternationalcoreStrategic or Co-development Partner · 19 October 2025Lennox International acquired the HVAC division of NSI Industries, which includes the Duro Dyne and Supco brand platforms, for approximately $550 million in cash. The acquisition was announced on October 19, 2025, and is expected to strengthen Lennox's offerings in HVAC parts and supplies for residential and commercial markets across North America. The deal was subsequently enhanced with strategic investments in distribution capabilities including a new 763,000 sq ft Regional Distribution Center in Edgerton, Kansas.

Scale indicators2 records

Recent moves4 records

Expansion highlights5 records

Direct peers

• Carnes Company: Mid-sized manufacturer of grilles, registers, diffusers, dampers, and air terminal devices. Directly comparable to Duro Dyne's air distribution and volume damper products.
• Metal Industries (MII): Manufacturer of HVAC grilles, registers, diffusers, and air distribution products. Comparable commercial and residential SKU overlap with Duro Dyne's air distribution portfolio.
• Thermaflex: Manufacturer of flexible duct and insulation products. Directly competes with Duro Dyne's flexible duct connector and duct fabrication/insulation offerings.
• Hart & Cooley: Long-standing manufacturer of HVAC registers, grilles, diffusers, and air distribution components. Direct competitor to Duro Dyne's air distribution product line for residential and light commercial HVAC markets.
• Titus (Johnson Controls): Manufacturer of air distribution products including diffusers, grilles, registers, and terminal units. Closely overlaps with Duro Dyne's air distribution and zone control categories for commercial HVAC.
• Price Industries: Major manufacturer of air distribution and ventilation components (grilles, diffusers, plenums, terminal devices). Comparable to Duro Dyne's commercial air distribution and duct fabrication offerings.
• DiversiTech: Wholesale distributor and manufacturer of HVACR parts, accessories, and installation supplies. Directly comparable to Supco's HVACR parts and Duro Dyne's install supplies portfolio serving HVAC contractors.

Emerging players

• Refrigeration Technologies: Manufacturer of HVACR service chemicals, coil cleaners, and specialty maintenance products. Comparable to Supco's chemicals and HVACR repair product lines for service technicians.
• RectorSeal: Manufacturer of specialty HVACR chemicals, sealants, accessories, and install supplies. Overlaps with Duro Dyne's HVAC install supplies category (chemicals, fasteners, sealants).

Broad incumbents

• CaptiveAire: Larger manufacturer of commercial kitchen ventilation systems with proprietary duct fabrication. Overlaps with Duro Dyne's duct fabrication and air distribution products but operates at broader kitchen-exhaust scale.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks5 records

Key highlights5 records

Customer concentration

• YouTubeyoutube.com/user/durodynecorp
• Facebookfacebook.com/DuroDyne
• LinkedInlinkedin.com/company/duro-dyne
• Instagraminstagram.com/durodyne
• Xx.com/durodyne

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Subsidiaries2 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 Duro Dyne