Explosion-Proof Refrigerators
and Freezers
Conventional refrigerators and freezers are not only
unsuitable for storing flammable materials; they can cre-
ate potential hazards in a facility. Such units have several
components in their electrical and refrigeration systems
that can trigger explosions of flammable air-vapor mix-
tures inside the unit or from the immediate surrounding
area.
Explosion-proof models are specifically designed and
engineered to prevent the triggering of an explosion inside
or outside of the unit in a Class I, Groups C and D haz-
ardous material environment.
It is important to note that Explosion-Proof models must
be connected to the power supply source by rigid metal
conduit or mineral-insulated cable with proper fittings suit-
able for Class I, Groups C and D hazardous locations. In
addition, the wires inside the conduit must be sealed.
Flammable Materials Storage
Refrigerators and Freezers
These Thermo Scientific units will prevent potentially
destructive explosions in any facility by meeting the stan-
dards established by Underwriters’ Laboratory, Inc.,
OSHA and National Fire Protection Association for stor-
age of hazardous materials. They also are designed to
comply with National Fire Protection Association
Standards Nos. 45 and 56C, as well as OSHA Article No.
29 CFR 1910.308. Thermo Scientific Flammable Materials
Storage Refrigerators/Freezers are manufactured for
safe, cold storage of volatile materials.
Flammable Material Storage (FMS)
Refrigerators/Freezers will prevent an explosion from
occurring inside the unit. These units have no internal
electrical components that could trigger an explosion of
hazardous materials inside the unit. They are NOT
designed for use in Class I, Groups C and D environ-
ments—for these locations use a Thermo Scientific
Explosion-Proof Refrigerator.
4
Overview
