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Proven performance in the most challenging environments

  • UL Listed for Class 1, Division 2, Groups A, B, C and D
  • Certified in accordance with ISA 12.12.01 and NFPA 70 (National Electric Code), ANSI/UL 484 Room Air Conditioners
  • KSA Registered and tested in accordance with SASO 2681
For more than three decades, global industry and high-tech leaders have trusted Hazardgard to provide commercial-grade cooling under the harshest conditions. You’ll find durable, reliable Hazardgard room air conditioners on oil rigs and military bases, in manufacturing companies and processing plants – anywhere hazardous materials are used. Hazardgard is specifically designed to cool spaces where volatile, flammable liquids and gases are used, within enclosed systems or containers, or under extreme temperatures.

Watch the Hazardgard Product Video

Temperature Classification

Electrical equipment, like hazardous location air conditioners, that may be exposed to specific, hazardous gases or vapors in the area where it will be used, cannot reach temperatures that exceed 80% of the auto-ignition temperature of those gases or vapors. Hazardgard has a T4 rating which means that it's surface temperature should not exceed 135°C or 275°F. (Note: 50/60Hz model listed as T4A for surface temperatures to 120° C/248° F).

Electrical Equipment Label Temperature (C) Temperature (F)
T1 450°C 842°F
T2 300°C 572°F
T2A 280°C 536°F
T2B 260°C 500°F
T2C 230°C 446°F
T2D 251°C 483.8°F
T3 200°C 392°F
T3A 180°C 356°F
T3B 165°C 329°F
T3C 160°C 320°F
T4 135°C 275°F
T4A 120°C 248°F
T5 100°C 212°F
T6 85°C 185°F

The above chart illustrates that 200°C is the maximum surface temperature for any electrical equipment with a temperature classification of T3 or higher.

Auto-Ignition Temperatures
(Vapors and Gases)

The maximum temperature at which a liquid, gas or vapor can ignite without the help of an outside source of heat is the auto-ignition temperature. These temperatures are determined based on conditions during laboratory testing. For example:

Gas Temperature (C) Temperature (F)
Methane 580°C 1076°F
Hydrogen 560°C 1040°F
Propane 493°C 919.4°F
Ethylene 425°C 797°F
Acetylene 305°C 581°F
Naphtha 290°C 554°F

Some surfaces, like that of a high-pressure steam pipe, can have a greater auto-ignition temperature than certain mixtures of fuel and air.

Auto-Ignition Temperatures

As seen on the chart below, the auto-ignition temperature of dust is typically greater than the auto-ignition temperature of vapors and gases. Such examples include:

Substance Temperature (C) Temperature (F)
Sugar 460°C 860°F
Wood 340°C 644°F
Flour 340°C 644°F
Grain Dust 300°C 572°F
Tea 300°C 572°F

Durable, Reliable and Safe

Robust engineering, commercial-grade components and extensive field testing show that Hazardgard provides the durability and safety required in hazardous locations. See the complete features list for details on what makes Hazardgard the best choice in tough operating environments.

Harsh Environments Demand Hazardgard

Hazardgard is ideal for:

  • Offshore oil rigs, onshore oil company offices and refineries
  • Petrochemical sites and propane fill-up stations
  • Paint and varnish storage or processing plants
  • Grain alcohol processors or storage sites
  • Plant areas using strong solvents or chemicals
  • Munitions plants or armories
  • PVC or plastics plants and processing points
  • Recycling plants
  • Furniture refinishing/stripping workshops
  • Fertilizer plants
  • Office complexes where methane is a by product
  • Hazardous materials storage
  • Container Lab
  • For analyzer houses/shelters
  • New Luvata coil coating (model SH24M20 only)

Electrofin Benefits:

  • excellent adhesion characteristics
  • Less than 1% thermal degradation
  • Outstanding chemical resistance
  • passed 6048 hrs. ASTM B-117 Salt Spray

Electrofin meets the following:

  • MIL-C-46168 Chemical Agent resistance -DS2, HCI Gas
  • CID A-A-52474A (GSA)
  • MIL-STD 810F, Method 509.4 (Sand and Dust)
  • MIL-P-53084 (ME)-TACOM Approval
  • MIL_DTL-12468 Decontamination Agent (STB)
  • DPG (Douglas Proving Grounds) Soil & Water exposure Tests
  • GM9540P-97 Accelerated Corrosion Test (120 cycles)
  • ASTM B!!&-G*% Modified Salt Spray (Fog) Testing-2,000 hours
  • ASTM B!!& Salt Spray (tested by ARL for Lockheed Martin)
  • DiamonBlue™ Advanced Corrosion Protection on the outdoor coil protects the coil against deterioration and extends the life of the unit especially in coastal or corrosive environments

ElectroFin® 5-stage, immersion ecoat process on 100% of metallic surfaces on the outdoor coil provides outstanding corrosion resistance protection in coastal or corrosive environments. (MODEL SH24M20)


Hazardgard can be installed in a window or thru-the-wall, provided the wall depth meets specifications.
A. Unit depth is 27 3/8 inches.
B. Depth of junction box to louvers is 6 inches.
C. Maximum wall depth of the thru-the-wall finished hole is 6 inches

Available in cooling-only models

  • Cooling: 14500 to 24000 Btu/h

  Comfort and Durability

  • Permanent split capacitor motor
  • Solid-state control relays for compressor and fan operation
  • Hermetically sealed refrigeration system
  • Environmentally sealed on/off switch and gold-plated contacts in thermostat resist corrosion
  • Hot gas bypass allows the air conditioner to operate at outdoor ambient temperatures as low as 7° C/45° F without freezing
  • Hermetically sealed reciprocating compressor is cooled during the refrigeration cycle, which allows the unit to tolerate higher outdoor temperatures up to 55° C/130° F
  • Larger, commercial-grade, enclosed fan motor with hermetically sealed overload for arc-free operation. It's totally enclosed to assure efficient operation under adverse electrical conditions.
  • Unit utilizes direct-wired, 15-amp circuit with time-delay fuse that tolerates surge current without tripping the breaker
  • 22-gauge, G60 steel air conditioner cabinet is powder coated for corrosion protection and to withstand years of hard use

  Sound-Reduction Technology

  • Steel inner wall blocks noise
  • Vibration-isolating design and components diminish operating sound levels
  • High density EPS foam insulation for thermal resistance and sound control

  Maintenance and Installation

  • Slide-out chassis for more permanent installation and easier access for maintenance
  • Installs in a window or thru-the-wall
  • Same sleeve dimensions for 20+ years for easy replacement

  Energy Management

  • Hazardgard meets T4 temperature classification means unit surface temperatures will not rise above 135° C/275° F. (note: 50/60Hz model listed as T4A for surface temperatures to 120°C/248°F)
  • Operates at low ambient conditions without freezing at outdoor ambient temperatures as low as 7° C/45° F
  • Tolerates higher outdoor temperatures up to 55°C /130°F
  • Equipment is certified in accordance with ISA 12.12.01 and NFPA 70 (National Electric Code)
  • Class I, Div. 2, Group A and Group B Class I, Zone 2, Group IIC
  • Class I, Div. 2, Group B Class I, Zone 2, Group IIB plus hydrogen, or "+H2"
  • Class I, Div. 2, Group C Class I, Zone 2, Group IIB
  • Class I, Div. 2, Group D Class I, Zone 2, Group IIA
  • Equipment is certified in accordance with ANSI/UL 484 and SASO 2681

  Safety and Security

  • Aluminum grille
  • Insect barrier
  • EntryGard™ anti-intrusion protection secures chassis to sleeve with steel retaining wire to deter kick-in intrusion

  Safety and Security

  • Washable, antimicrobial air filter
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