HVAC built for environments where standard equipment is not an option.
Custom Controls Company designs and manufactures explosion-proof HVAC systems for classified hazardous locations. With over a century of engineering expertise, their systems range from compact 6,000 BTU units to 200-ton rooftop installations — fully custom-engineered to the application, the classification, and the operating environment.
What Is a Hazardous Location?
A hazardous location is any area where flammable gases, vapors, liquids, combustible dust, or ignitable fibers may be present in concentrations sufficient to create a fire or explosion risk. The National Electrical Code (NEC) classifies these areas by the type and likelihood of the hazardous material present.
Standard HVAC equipment — with its electrical motors, contactors, and control components — can act as an ignition source in these environments. Equipment installed in classified locations must be specifically designed, certified, and labeled for the hazard class.
Division Note
Division 1 locations have hazardous materials present under normal operating conditions. Division 2 locations have hazardous materials present only under abnormal conditions. Equipment must be rated for the specific Division as well as Class.
A Century of Explosion-Proof Engineering
Custom Controls Company has been designing explosion-proof HVAC and control systems for over 100 years. Their systems are not modified commercial equipment — they are purpose-engineered for classified locations from the ground up.
Every component is selected, rated, and assembled to meet the specific classification requirements of the application. When the environment demands it, there is no substitute for purpose-built engineering.
Built for the Most Demanding Environments
Full Capacity Range
Systems available from compact 6,000 BTU wall units to massive 200-ton rooftop systems — the right size for any classified space, from a small pump room to a full production facility.
Custom-Engineered
No two hazardous environments are exactly alike. Custom Controls designs systems that match the specific classification, layout, and operating requirements of each facility.
Third-Party Certified
Systems carry appropriate certifications for the hazard classification — UL, cUL, and/or FM listings for the specific Class, Division, and Group of the installation.
100+ Years of Experience
A track record across oil and gas, chemical, military, and industrial facilities that supports critical safety decisions.
Industries We Serve
Oil and Gas
Refineries, compressor stations, pump houses, metering facilities, offshore platforms
Chemical Processing
Production facilities, tank farms, loading areas, laboratory spaces
Wastewater Treatment
Digester buildings, pump stations, chemical storage areas
Mining and Extraction
Underground facilities, processing plants, explosive storage areas
Grain and Agricultural
Grain elevators, processing facilities, storage buildings with dust classification
Military and Defense
Ammunition storage, fuel facilities, classified weapon system environments
Paint and Finishing
Spray booth ventilation, solvent storage, mixing rooms
Pharmaceutical Manufacturing
Solvent-based production areas with vapor classification requirements
Every Project Begins with a Conversation
Hazardous location HVAC is not a catalog order. The right system depends on the area classification (Class, Division, Group), the specific hazard, the climate, the cooling and heating load, and applicable codes governing the facility.
To start a project inquiry, provide:
Hazardous Equipment — Literature & Resources
Product literature, videos, brochures, and technical documents for explosion-proof HVAC equipment.
Hazardous Equipment — Full Resource Library
Brochures, videos, technical specs, and application guides — opens in Paperflite viewer.
