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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
Figure 3.2.1 Nozzle Placement for
Overhead Local Application
3.2.1 Local Application - Overhead
An overhead local application system is used for applying dry chemical, discharged from above, directly
onto a burning hazard. Typical applications include dip tanks, power generators and transformers.
3.2.1.1 Nozzle Orientation
e Local Application Overhead Nozzle
(LAOH Nozzle) (P/N 16216) has been
developed to provide local application of
extinguishing agent from an overhead position.
Each nozzle will protect a hazard area of 27 ft²
(2.5 m²) with a 6 ft (1829 mm) maximum side.
e maximum nozzle height is 10 ft (3048 mm).
e minimum nozzle height is 8 ft (2438 mm)
(for fuel in depth splash hazards). Note: Nozzle
height is measured from the hazard surface to
the closest point of the nozzle in the installed
position.
3.2.1.2 Temperature Limitations
e operating temperature range for the
system components used in Local Overhead
applications is 32°F to 120°F (0°C to 49°C).
3.2.1.3 Agent Application
Each LAOH Nozzle must discharge a minimum of 1.5 lbs (0.68 kg) of dry chemical agent per second
(a minimum flow rate of 1.5 lb/s (0.68 kgs/s)). Additionally, in protecting hazards where splashing may
occur, each LAOH Nozzle cannot discharge more than 2.25 lbs (1.02 kg) of dry chemical agent per second
(a maximum flow rate of 2.25 lb/s (1.02 kg/s)). 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.
Section 3 System Design
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