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MV & LV SERIES ENGINEERED DRY CHEMICAL FIRE EXTINGUISHING SYSTEM
OPERATION, DESIGN, & SERVICE MANUAL
REV C
Document # DOC324
Issued: April 26, 2018
Revised: March 22, 2022
UL FILE # EX27541
3 SYSTEM DESIGN
e Janus Fire Systems® Dry Chemical Fire Extinguishing System may be used on a variety of hazards in
many types of applications. e guidelines listed in this section address and detail the design methods tested
and UL listed for the hazard groups noted below:
• General Purpose and Industrial Hazards (Refer to Section 3.2)
• Vehicle Paint Spray Booths Hazards (Refer to Section 3.3)
• Open Front Paint Spray Booth Hazards (Refer to Section 3.4)
It is the responsibility of the Certified Installer to ensure that the proper system components are being
utilized, and that the system meets the limitations and parameters listed in this chapter. ose individuals
responsible for the design of the Janus Fire Systems® Dry Chemical Fire Extinguishing System must be
trained by Janus Fire Systems and hold a current Janus Fire Systems Certificate. Janus Fire Systems will not
be responsible for system design, installation, or maintenance performed by any non-certified person(s). All
designs must be performed in conjunction with the Janus Design Suite® Flow Calculation Software.
3.1 Hazard Analysis
e first step in designing a dry chemical system is to identify the unique requirements of the hazard to be
protected.
3.1.1 Fuel Source
It is necessary for the system designer to consider the combustible materials found in the hazard vicinity to
ensure proper protection. e system design must be listed for the hazard class of the combustible material.
e Janus Fire Systems® Dry Chemical Fire Extinguishing System may be used with the following hazard
classes:
• Class A: Ordinary solid carbonaceous combustibles. ese include wood, paper, cloth, fiberglass, and
plastics
• Class B: Flammable liquids and gases. ese include paints, solvents, gasoline, oils, and hydraulic fluids.
• Class C: Electrical appliances. ese include computers, power generators, and power transformers.
e Janus Dry Chemical System is NOT intended or suitable to protect Class D hazards (Combustible
metals such as sodium, potassium, magnesium, titanium, and zirconium.)
Per NFPA 17, dry chemical systems are not approved for deep-seated or burrowing fires (such as ordinary
combustibles, where the agent cannot reach the point of combustion), or on chemicals that contain their
own oxygen supply (such as cellulose nitrate). Do not mix different types of agents, or agents from different
manufacturers. Chemical reactions may occur when incompatible chemicals are mixed. Keep in mind that
the agent used for each system must be acceptable to the Authority Having Jurisdiction (AHJ). NOTE:
Although NFPA 33 permits Dry Chemical Systems to protect dry powder and electrostatic liquid spray
booths under certain criteria, Janus Fire Systems prohibits installation of the its Engineered Dry Chemical
System in such booths.
Before dry chemical extinguishing is considered for use in protection of electronic equipment or delicate
electrical relays, the effect of residual deposits of dry chemical on the performance of electronic equipment
shall be evaluated. ABC dry chemical shall not be used on machinery such as carding equipment in textile
operations.
Section 3 System Design
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