What Milcor does

Milcor, founded in 1902 and headquartered in Grand Rapids, Michigan, is a US manufacturer of building access products, including interior and exterior access doors, roof access hatches, floor and sidewalk doors, heat and smoke vents, duct access doors, and complementary safety accessories. The company produces both standardized catalog items (with variants such as the M architectural-grade flush door, the UFR fire-rated access door, the Thermal Pro-24 roof hatch, and the Saf-T-Rail retrofit safety rail) and custom-fabricated solutions tailored to specific architectural specifications, using steel, aluminum, galvanized steel, and stainless steel constructions with polyisocyanurate insulation, EPDM gaskets, and other engineered components. Milcor holds third-party certifications including UL/CUL Class B fire ratings, Warnock Hersey labels, OSHA fall-protection compliance, and Florida Product Approval #16737, and is the assignee of US Patent #US10501942B2 covering the Saf-T-Rail system.

Milcor operates as a portfolio company of Duravent Group, a 14-brand building products conglomerate, and was acquired in 2026 by Admati Agencies Mechanics, a global manufacturer with a stated supply network of approximately 90 factories. The company sells through enterprise field sales (targeting building owners, architects, and contractors), a quote-based direct-sales channel reachable at (800) 433-6341 / [email protected], and the Duravent Group brand-store e-commerce portal at duravent.aether-stores.io. Pricing is not publicly disclosed; quotes are required. Headcount is reported at 11-50 employees, revenue is not publicly disclosed, and Milcor is a private subsidiary without public funding history.

Name

Milcor

Legal name

Milcor

Website

https://milcorinc.com

Company type

Private

Founded year

1902

Operating status

Operating

Headcount range

11–50 employees

Short description

Milcor is a 120-year-old US manufacturer of building access products — access doors, roof hatches, floor and sidewalk doors, and heat and smoke vents — serving architects, contractors, and building owners through Duravent Group distribution and direct enterprise sales.

Ownership category

akta.pro rank

Product category

Building Access Products

NAICS

Metal Window and Door Manufacturing (332321), Ornamental and Architectural Metal Products Manufacturing (33232)

SIC

Metal Doors, Sash, Frames, Moldings & Trim (3442)

akta.pro primary industry

Architectural & Miscellaneous Metals (Stairs, Railings, Ladders) (IMADACAE)

akta.pro secondary industry

Louvers, Vents & Architectural Grilles (IMADAIAM)

Keywords

• Building access doors
• Roof access hatches
• Floor sidewalk doors
• Heat smoke vents
• Custom metal fabrication

Headquarters

HQ city

Grand Rapids

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, Infrastructure, Personnel, Marketing or Sales, Technology or R&D

Revenue model

1. Building Access Products Sales: Milcor generates revenue through the sale of physical building access products including interior access doors, roof hatches, floor and sidewalk doors, and heat/smoke vents. Products are sold as standard catalog items and custom fabricated solutions to building professionals.

Go-to-market motion1 record

Distribution channels3 records

Marketing channels3 records

Core offering

Milcor manufactures and sells physical building access products including interior access doors, roof access hatches, floor and sidewalk doors, and heat and smoke vents. Products are made from steel, aluminum, galvanized steel, and stainless steel with various fire-rated, insulated, security, and weather-resistant configurations, and are sold as standard catalog items and custom-fabricated solutions to building professionals.

Product overview

Milcor, founded in 1902 and acquired by Admati Agencies Mechanics in 2026, offers an extensive portfolio of building access solutions including interior access doors (Architectural Grade M Series, Standard Flush DW and K Series, Fire-Rated UFR and NIFR Series, Security SEC Series, Recessed AT/ATR/AP/DWR Series, Exterior EXT Series, Economical E Series), roof access hatches (Single Leaf M-1, Ladder Access, Ship Stair, Service Stair, Equipment Double Leaf, Energy Efficient Series, Thermal Pro-24), floor and sidewalk doors (GA/GD Steel and Aluminum Sidewalk, F/T/Z Non-Security Aluminum Floor, F/T Security Aluminum Floor), heat and smoke vents, duct access doors (DSA Single-Wall, DSA HT High-Temperature, DSA DW Double-Wall), and safety accessories (Saf-T-Rail Retrofit Safety Railing, Upright Safety Bar). As part of the Duravent Group of 14+ brands, Milcor provides both standardized off-the-shelf products and custom-manufactured solutions serving architects, contractors, and building owners across commercial and residential construction.

Differentiator

Problem solved

Functional benefit

Brands

• Primex: Primex AP6x9SW Access Panel - an aesthetically pleasing and easy-to-install cover and frame unit for HVAC, plumbing or electrical systems.

Products and services

• Access Doors Interior access doors providing building infrastructure access, including flush panel, architectural grade, fire-rated, security, recessed, exterior, and economical models in steel, aluminum, and stainless steel configurations. For building professionals and building owners.
• Roof Access Hatches Roof access solutions including single leaf hatches, ladder access, ship stair, service stair, equipment access double leaf, and thermal-efficient models with insulated curbs and high load capacities. For building owners, contractors, and architects.
• Floor & Sidewalk Doors Heavy-duty floor and sidewalk access doors in steel and aluminum with diamond tread plates, supporting live loads up to 300 psf, featuring drainage systems and torsion lift assistance. For commercial and public infrastructure.
• UFR — Universal Fire Rated Access Doors Fire-rated access doors carrying UL and CUL 1½-hour Class B fire rating with Warnock Hersey Label for three-hour floor/ceiling systems. Features 250-degree temperature rise protection and automatic panel closers. For commercial buildings requiring fire-rated assemblies.
• Thermal Pro-24 Roof Hatch High-performance aluminum roof hatch featuring 3-inch polyisocyanurate insulation, thermal breaks, condensation liners, and R-24 thermal resistance for superior energy efficiency and extreme temperature change resistance. 70 psf load capacity, opens to 68-85 degrees. For energy-efficient building designs.
• Heat & Smoke Vents Ventilation products for building safety, enabling heat and smoke release during fire emergencies. For commercial buildings requiring fire safety compliance.
• DSA Compression Duct Doors Formed galvanized steel duct access doors for single-wall, double-wall, and high-temperature (up to 2000°F) applications with neoprene/ceramic gasket sealing, pressure tested to 20 inches WG. For HVAC and ductwork applications.
• Styles F and T — Security Aluminum Floor Doors Security-rated aluminum floor doors with 1/4-inch tread or smooth plates supporting 150 psf live load, featuring neoprene gaskets and torsion bar lift assistance. For commercial buildings requiring secure floor access.
• Saf-T-Rail Retrofit Safety Railing System Non-penetrating roof hatch safety railing system with telescoping aluminum rails. OSHA compliant (29 CFR 1910.23 and 1926.502), supports 200 lbs force, 5-year warranty. For building owners needing OSHA-compliant fall protection.

Segments3 records

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.

• Admati Agencies MechanicscoreStrategic or Co-development PartnerAdmati Agencies Mechanics acquired US-based Milcor to expand into the off-the-shelf products market. This acquisition enables Milcor to leverage Admati's integrated manufacturing model offering CNC machining, multi-layer PCB fabrication, and industrial sheet-metal bending services under a single entity, with access to a global supply network of approximately 90 factories worldwide and dual quality-control processes.

Scale indicators3 records

Recent moves5 records

Expansion highlights5 records

Direct peers

• Nystrom: Nystrom manufactures access doors, roof hatches, floor doors, smoke vents, and stair treads for the building construction industry. Its product portfolio overlaps almost entirely with Milcor's, making it a direct peer in specification-driven commercial building products.
• Acudor: Acudor specializes in access doors and panels for walls and ceilings, including fire-rated, security, recessed, and exterior models. It competes directly with Milcor in the interior and exterior access doors category.
• Bilco: Bilco is a leading North American manufacturer of roof access hatches, floor access doors, and smoke vents for commercial and institutional buildings. It is the most direct head-to-head competitor to Milcor across Milcor's core access doors and roof hatches categories.
• Williams Brothers Corporation of America: Williams Brothers produces access doors, roof scuttles, and vault doors for the construction industry. Its door and scuttle ranges overlap with Milcor's access doors and floor/sidewalk door categories.
• Karp Associates: Karp Associates produces access doors and panels for plumbing, electrical, and HVAC access in commercial and institutional buildings. Its standard and fire-rated access door lines compete directly with Milcor's M, DW, and UFR series.
• Babcock-Davis: Babcock-Davis manufactures access doors, roof hatches, floor doors, and smoke vents for commercial construction. It serves the same architects, contractors, and building owners as Milcor across substantially the same product categories.
• Cendrex: Cendrex manufactures access panels and doors for walls and ceilings. It competes with Milcor's recessed, drywall, and standard flush access door lines serving similar contractor and DIY-adjacent channels.
• Elmdor: Elmdor manufactures access panels and doors for residential and commercial applications. It competes with Milcor's lower-priced and recessed access panel SKUs in the same architect/contractor specification channel.

Others

• Duravent Group: Duravent Group is Milcor's parent conglomerate unifying 14 brands in venting and air control. While not a direct competitor to Milcor's access products, it provides the distribution, brand store, and customer relationships that Milcor leverages.

Broad incumbents

• Activar Construction Products Group: Activar CPG is the parent company of multiple building product brands including access doors and specialty architectural products. As a diversified construction products platform, it competes with Milcor through multiple brand touchpoints in adjacent categories.

Market position

Strengths5 records

Weaknesses4 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

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 Milcor