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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
3.3.3.1 Plenum Coverage
For plenum coverage of a Vehicle Paint Spray Booth, the nozzles are used as indicated in Tables 3.3.3a,
3.3.3b, 3.3.3c, 3.3.3d. Additionally, each nozzle must discharge a minimum of amount of dry chemical agent
per second (minimum flow rate) as indicated in table 3.3.3.1. e Janus Design Suite® Flow Calculation
Software will determine the amount of dry chemical agent required to meet these flow rates based on the
hazard dimensions and number of nozzles required.
Table 3.3.3.1 VPSB Plenum Coverage - Minimum Flow Rates
Nozzle Type PN Application
Minimum Flowrate Minimum
Discharge Time
(sec)¹
Minimum Agent
Discharged
Per Nozzle
lb/s kg/s lbs kg
TF Nozzle 16172 Plenum 1.74 0.79 5.0 8.7 3.95
D/P Nozzle 16190
Duct; Plenum
(multiple nozzle system)
1.76 0.80 5.3 9.33 4.24
D/P Nozzle 16190
Duct; Plenum
(single nozzle system)
2.06 0.93 8.3 17.10 7.72
3-Way Nozzle 16174
Plenum
(multiple nozzle system)
1.9 0.86 5.5 10.45 4.73
3-Way Nozzle 16174
Plenum
(single nozzle system)
2.16 0.98 8.0 17.28 7.84
¹ Maximum discharge time is 30 seconds as required by NFPA 17. Actual discharge time to be determined by Janus
Design Suite software
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