ASI Doors

What ASI Doors does

ASI Doors, Inc. is a Milwaukee, Wisconsin-based manufacturer of high-performance engineered door systems founded in 1965 and owned by the Balbach family since 1974. The company designs, engineers, and manufactures its products at a single facility at 5848 North 95th Court, Milwaukee, and sells across three registered sub-brands: Cleanseal (cleanroom sliding, swinging, and fire doors for pharmaceutical and biotech environments meeting ISO 3, cGMP, USP, FDA, and EMEA requirements), Enviro (cold storage and freezer doors with rigid and fabric roll-up configurations and the patent-pending Iso-Flex impactable flexible-panel system), and Marathon (high-speed rigid and fabric roll-up doors serving industrial, commercial, parking, automotive, and government facilities). Proprietary technology includes a 1981-patented door operator, the patent-pending Iso-Flex panel with exclusive wall track guidance, and the AirSeal air door system that uses high-velocity airflow to maintain separate climate zones.

The company monetizes through one-time sales of engineered door systems plus replacement parts and technical documentation, with quote-based pricing and multi-year contract cadences. Go-to-market combines direct regional sales managers across US territories with a network of certified national and international distributors and GSA Schedule Contract #GS07F0813N access for federal, state, and local government buyers since 2003. Customer concentration spans pharmaceutical manufacturers (e.g., PCI Pharma Services), cold storage and food distribution operators (e.g., Burris Logistics, a leading cold storage provider with 180+ facilities), parking and auto-dealership operators, and government facilities — with supporting marketing delivered through the company website, a resource center of videos and case studies, AIA CES-accredited Lunch & Learn programs, BSD Speclink architectural listings, and active social channels.

ASI is a private, family-owned company with 51–100 employees, no external venture or private equity investment, and a leadership team consisting of CEO George F. Balbach, General Manager Greg Gescheidle, and CFO Brad Nennig. Recent strategic activity includes the 2021 ISO-Flex product launch and a series of sales-coverage and finance hires that suggest measured organic expansion rather than aggressive scale-seeking.

Name

ASI Doors

Legal name

ASI Doors, Inc.

Website

https://asidoors.com

Company type

Private

Founded year

1965

Operating status

Operating

Headcount range

51–100 employees

Short description

ASI Doors, founded in 1965 and based in Milwaukee, WI, manufactures high-performance engineered door systems — including cleanroom, cold storage, and high-speed industrial doors — sold under the Cleanseal, Enviro, and Marathon brands to pharmaceutical, food distribution, and government customers via direct sales and certified distributors.

Ownership category

akta.pro rank

Product category

Industrial Door Manufacturing

NAICS

Metal Window and Door Manufacturing (332321)

SIC

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

akta.pro primary industry

Commercial & Industrial Doors (Sectional, High-Speed, Fire, Security) (IMADAIAF)

akta.pro secondary industries

Garage Doors & Rolling Shutters (IMADAIAE), Fire Door, Firestop & Passive Fire Protection Inspection/Installation (IMAIAJAJ)

Keywords

• High performance doors
• Cold storage doors
• Cleanroom door systems
• Industrial roll-up doors
• Fire rated doors

Headquarters

HQ city

Milwaukee

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Door System Sales: One-time sale of high-performance door systems including rigid roll-up doors, fabric roll-up doors, sliding doors, swinging doors, fire doors, and impactable doors for various industrial and commercial applications.
2. Replacement Parts: Sale of replacement parts, owners manuals, architectural specs, and parts lists for existing door installations.
3. GSA Government Sales: Sales to Federal, State & Local Governments through GSA Contract holders (#GS07F0813N) since 2003.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels8 records

Core offering

ASI Doors manufactures and sells high-performance door systems for pharmaceutical, cold storage, industrial, commercial, and government applications. Its portfolio spans rigid roll-up doors (Marathon), fabric roll-up doors, sliding and swinging cleanroom doors (Cleanseal), cooler and freezer doors (Enviro), U.L.-rated fire doors, and impactable sliding doors including the patent-pending ISO-Flex Series. All products are engineered, manufactured, and assembled at the company's Milwaukee, Wisconsin facility.

Product overview

ASI Doors manufactures high-performance door systems organized into three sub-brands: Cleanseal (cleanroom door systems for pharmaceutical, biotech, and controlled environments meeting GMP and ISO 3 standards), Enviro (cold storage door systems for refrigerated and frozen food & beverage applications), and Marathon (high-speed, high-performance doors for industrial, commercial, and security applications). The product portfolio includes rigid roll-up doors (Model 109), fabric roll-up doors (Models 215, 315), sliding doors (multiple fiberglass and stainless steel models from 1240-170 series), swing doors (Models 120-413), fire doors (UL-rated models 255-235ssf), and impactable sliding doors. The ISO-Flex Series represents their newest patent-pending technology featuring damage-resistant flexible panels with wall track guidance. All products are engineered and manufactured at their Milwaukee, WI headquarters.

Differentiator

Problem solved

Functional benefit

Brands

• Cleanseal: Cleanroom door systems designed to meet critical demands of controlled environments, including GMP, biotech and pharmaceutical requirements
• Enviro
• Marathon

Products and services

• Marathon High Performance Doors Sub-brand line of high-speed, high-performance roll-up doors designed for quick access, security, and reliable operation in auto dealerships, parking garages, commercial buildings, hospitals, and government facilities.
• Enviro Cold Storage Door Systems Sub-brand line of door systems engineered for refrigerated and frozen environments, addressing the challenges of cold storage, food and beverage, and distribution-center applications.
• Cleanseal Cleanroom Door Systems Sub-brand line of cleanroom door systems (sliding and swinging) designed to meet GMP, pharmaceutical, biotech, and ISO 3 / Class 1 controlled-environment requirements.
• ISO-Flex Series — Model XP 2200 Bi-parting sliding flexible-panel impactable cold storage door with patent-pending Iso-Flex construction (4-inch R-17 panel) and exclusive wall track guidance system designed to reduce downtime and repair costs in freezer applications.
• ISO-Flex Series — Model XP 2700 Single sliding flexible-panel cold storage door with patent-pending impactable Iso-Flex design and 4-inch R-17 thermoplastic panel construction for freezer applications.
• Model 109 High Performance Roll-Up Door Low-profile high-performance rigid roll-up door with curved panel profile, opening speeds up to 42 inches per second, designed for limited headroom and tight side clearances in parking garages, ventilation, manufacturing, and government applications.
• Model 215 High-Speed Fabric Roll-Up Door High-speed fabric roll-up door designed for interior, exterior, cooler, or freezer applications, with options for stainless construction and insulated fabric.
• Model 315 High-Speed Fabric Roll-Up Door High-speed fabric roll-up door for heavy-traffic areas where convection reduction is the goal, with opening speeds up to 100 inches per second.
• Cleanroom Sliding Door Models (1240, 1250, 1240ss, 1250ss, 1260, 1270, 1260ss, 1270ss, 140, 150, 160, 170) Manual and power single and bi-parting sliding doors in fiberglass and stainless-steel constructions for sterile pharmaceutical, biotech, and industrial environments, with fast open/close times and corrosion-resistant stainless options.
• Cleanroom Swing Door Models (220, 225, 220SS, 225SS, 230, 235, 230SS, 235SS, 120, 125, 130, 135, 413) Manual and power single and paired swinging doors in fiberglass and stainless-steel constructions for cleanroom and cold-storage traffic, with full perimeter seals, one-piece pultruded construction, and durable stainless options for heavy hand-truck/personnel use.
• U.L.-Rated Fire Doors (Models 255, 265, 220ssf, 225ssf, 230ssf, 235ssf) U.L.-compliant single and bi-parting sliding and swinging fire doors for pharmaceutical, industrial, and cleanroom fire protection, including 90-minute fire-rated configurations in manual and power versions.
• Impactable Sliding Doors Sliding doors engineered to resist impact damage from forklifts, providing improved energy savings, productivity, and material-handling efficiency for food and beverage facilities.
• Replacement Parts and Documentation Sale of replacement parts, owners manuals, architectural specifications, and parts lists for existing ASI door installations.

Quantifiable outcome

• Opening speeds up to 100 inches per second for fabric doors and 80 inches per second for rigid roll-up doors
• +3 more outcomes

Named customers8 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Scale indicators1 record

Recent moves9 records

Expansion highlights5 records

Direct peers

• Cornell Iron Works: Manufacturer of high-performance rolling steel and high-speed doors used in commercial, industrial, and security applications; overlaps ASI's Marathon product family and target buyer.
• Rytec Corporation: US manufacturer of high-speed, high-performance industrial doors; directly competes with ASI's Marathon line in rigid roll-up and fabric roll-up applications for warehouses, parking, and manufacturing facilities.
• Chase Industries (Durulite): US manufacturer of insulated cold-storage and industrial doors; directly overlaps with ASI's Enviro line in cooler/freezer and impactable cold storage applications.
• Mars Air Doors: Manufacturer of industrial air curtains/air doors; directly comparable to ASI's AirSeal technology in providing high-velocity airflow climate barriers for cold storage and industrial openings.
• Entrematic (Dynaco / Ditec): Global supplier of high-performance industrial doors including high-speed roll-up and cold-storage doors; directly competes with ASI across industrial and food/cold-chain verticals.

Broad incumbents

• Overhead Door Corporation: Broad incumbent in commercial and industrial doors including high-speed, fire, and sectional doors; addresses overlapping buyer needs to ASI's Marathon line in parking garages, auto dealerships, and manufacturing.
• Hörmann Group: One of the world's largest manufacturers of industrial, commercial, and specialty doors; overlaps ASI's Cleanseal, Enviro, and Marathon lines including high-speed, fire-rated, and cleanroom doors.
• ASSA ABLOY Entrance Systems: Global division of ASSA ABLOY focused on automated industrial and commercial doors; competes with ASI in high-performance industrial environments and cleanroom/cold-chain adjacent applications.

Emerging players

• Subzero Insulated Doors: Specialty manufacturer of insulated cold-storage doors for warehouses and food facilities; addresses a narrower subset of ASI's Enviro product family with focused cold-chain positioning.

Regional players

• TNR Industrial Doors: Canadian manufacturer of high-performance industrial and high-speed doors; overlaps ASI's Marathon line but primarily serves the Canadian market, making it a relevant regional comparable.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/asidoors
• Facebookfacebook.com/asidoorsinc
• LinkedInlinkedin.com/company/asi-doors

Compliance5 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 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 ASI Doors