Janus Mv Series User Manual

Page: 49
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
NFPA 33 Standard for SprayApplication Using Flammable and Combustible Materials classies the interior
sections of paint spray booths, and certain areas adjacent to booth openings, as Class-I or Class-II, Division-1 or
Division–2locations.ElectricalcomponentsofanIndustrialDryChemicalSystem,suchasthermostatslocated
withintheseareasshallberatedforuseinclassiedareas,andallwiringtothesecomponentsshallconformto
theprovisionsofNFPA70,NationalElectricalCode,forClass–IorClass-II,Division-1orDivision-2locations.
3.3 Vehicle Paint Spray Booth (VPSB)
e Janus Fire Systems® Vehicle Paint Spray Booth Fire Extinguishing System is of the engineered type
as defined by the NFPA Standard for Dry Chemical Extinguishing Systems, NFPA 17 and the Standard
for Spray Application Using Flammable or Combustible Materials, NFPA 33. e extinguishing systems
described in this manual are intended to be installed, maintained, and serviced in accordance with NFPA
17 and NFPA 33. e Janus Fire Systems® Vehicle Paint Spray Booth System has been evaluated by
Underwriters Laboratories (UL) in accordance with the specific test protocol found in the UL Standards.
Used for painting or coating cars, trucks, buses and large mobile equipment, Vehicle Paint Spray Booths
come in a variety of configurations and sizes. e basic volumes of a Vehicle Paint Spray Booth to be
protected by the dry chemical system consist of three main components. ey are:
Work Area - Where the vehicle is painted.
Plenum(s) – Exhaust chambers adjacent to the Work Area. Plenums utilize filters to trap overspray
particles that escape from the Work Area. e primary purpose of the plenum is to expose a sufficiently
large area of filter media to the overspray that is carried along in a smooth current of air.
Duct(s) - Fan-powered air channels that draw air through the Work Area, the Plenum(s), and finally
out through the Duct.
Most of the time, the air is drawn downward over the vehicle during the painting process (as in either an
Under Floor, Pit, or Down Draft (Side-Exhaust) configuration). Other booths, such as a Back Draft or
Pant-Leg (Horseshoe) design, draw air down and across, toward the rear of the booth. Fresh air is usually
drawn in through intake filters either in the Work Area ceiling or on the upper walls of the Work Area.
Many installations utilize a Heated Make-Up / Recirculation option, which re-circulates filtered, heated air
through the booth, thereby being more energy efficient.
e Janus Fire Systems® Vehicle Paint Spray Booth System requires that the spray booth exhaust fan(s) be
shut down prior to the discharge of the ABC dry chemical¹. is is accomplished with the use of the Janus
Fire Systems control panel. It is the responsibility of the installer to properly identify the configuration
of the booth and to follow the requirements of this manual in order to achieve proper fire suppression.
Sometimes, additional turns, baffles, or obstructions in the booth’s plenum and duct may dictate the use of
additional nozzles in order to ensure good distribution of dry chemical.
Section 3 System Design
1
The Janus Fire Systems® Open Paint Spray Booth does NOT require the exhaust fan to be shut down. Refer to Section 3.4
for more information.

Janus Mv Series Specifications

General

Brand	Janus
Model	Mv Series
Category	Fire Extinguisher
Language	English