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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
Section 3 System Design
3.4 Open Front Paint Spray Booths (OFPSB)
e Open Front 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 Open Front Paint Spray Booth System has been evaluated by Underwriters Laboratories (UL) in
accordance with the specific test protocol found in the UL Standards.
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.
Open Front Paint Spray Booths come in a variety of dimensions, but only one basic configuration. e basic
volumes of an Open Front Paint Spray Booth to be protected by the Janus Fire Systems® Dry Chemical
System consists of three main components. ey are:
Work Area - Where the part or equipment is painted with possibly flammable or combustible material (i.e.
paints, finishes, lacquers, etc.). e Work Area is open on the front, but enclosed on the sides and top, with
a filter bank at the back.
Plenum – Exhaust chamber at the rear of the Work Area. Plenums utilize filters to trap overspray particles
that escape from the Work Area. Air is drawn in through the front of the booth, across the Work Area, and
back through the Plenum.
Duct - Fan-powered air channel that draws air through the Work Area, the Plenum, and finally out through
the Duct.
It is not necessary to shut the exhaust fan down upon system discharge; however, check with the authority
having jurisdiction¹. 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.
NFPA 33 Standard for SprayApplication Using Flammable and Combustible Materials classies the interior
sectionsofpaintspraybooths,andcertainareasadjacenttoboothopenings,asClass-IorClass-II,Division–2
locations. Electrical components of an Industrial Dry Chemical System, such as thermostats located within
theseareasshallberatedforuseinclassiedareas,andallwiringtothesecomponentsshallconformtothe
provisionsofNFPA70,NationalElectricalCode,forClass–IorClass-II,Division-2locations.
3.4.1 Temperature Limitations
e operating temperature range for Open Front Paint Spray Booth applications is -20°F to 120°F (-29°C
to 49°C) for booths up to 12 ft (3657 mm) high. e operating temperature is 0°F to 120°F (-18°C to 49°C)
for booths above 12 ft (3657 mm) high to booths 18 ft 6 in (5639 mm) high.
1
The Janus Fire Systems® Open Front Paint Spray Booth System has been tested with exhaust fan systems operating or run-
ning. For Vehicle Paint Spray Booths, this testing has not occurred so it is necessary to shut o the booth exhaust fan prior to
discharge of the system. Refer to Section 3.3 for more information.
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