Explosion Proof Walk-in

Polar King’s Explosion Proof Walk-in Units for Hazardous Location Use

Martin Smazenko Hazardous Locations

Polar King manufactures explosion-proof walk-in freezers and cooler units for hazardous location use. Each unit is custom-built for each specific customer, based on their needs.

Polar King offers classes 1, 2, &3 and division 1 &2 ratings for walk-in freezer and cooler units. Their products comply with chapter 5 of the National Electric Code.

Hazardous Locations and Explosion Proof Walk-in Coolers and Freezers

Before we explore hazardous locations, let’s first understand an explosion-proof unit. Explosion-proof units have spark-proof interior and exterior surfaces to prevent ignition in hazardous environments. The units come without internal electrical components, and those on the outside have seals to NFPA and OSHA guidelines.

Explosion Proof Walk-in

Polar King Explosion Proof Walk-in Units

Hazardous locations are areas where flammable fluids or ignitable material may be found in enough amounts to trigger an explosion or a fire in case of a spark. Hazardous locations are classified into three classes to show the hazardous materials and two divisions to indicate the hazardous conditions. 

Hazardous Location Classification

Class 1

This classification indicates the presence of flammable gases or vapors risking an explosion or fire in the presence of an ignition source.


  • Petroleum and petroleum products handling facilities
  • Dry cleaning plants
  • Spray painting plants

Class 2

This classification signals the presence of combustible dust in explosive or ignitable amounts.

 Example locations:

  • Grain, animal feed, and flour mills
  • Aluminum powder, fireworks, and starch producers

Class 3

The third classification indicates the presence of ignitable fibers that can cause a fire.

 Typical class 3 locations include:

 Textile industries

  • Cotton gins and mills
  • Wood product factories

Hazardous Location Divisions

Explosion Proof Walk-in

Division 1

These are the normal conditions under which hazardous materials may be present. In these conditions, hazardous materials surface during everyday operations, including repair and maintenance activities.

Division 2

These are the abnormal conditions under which hazardous materials may be present. Hazardous materials should be confined and only present through faulty operations or broken storage in these conditions.

About Polar King Explosion Proof Walk-in Units

As the industry’s #1 manufacturer of seamless fiberglass outdoor walk-in coolers and commercial walk-in freezers, Polar King units are designed to endure even the most rugged conditions and climates. All Polar King commercial walk-in coolers and outdoor walk-in freezers are delivered fully assembled and require only a simple electrical connection to put them into operation. With a 100% seamless fiberglass design, Polar King offers the industry’s only one-piece, outdoor unit.

Contact us to learn more!