VeHICLE SQUARE Rail - ExTERNAL CRAB (VSRX ) TM RaiL SysteMS The Vehicle Square Rail - External Crab (VSRX) is the ideal solution for heavy-duty vehicles that move through an apparatus garage up to 120 ft (36,5 m) in length. The rail runs parallel with the vehicle, and the nozzle disconnects automatically as the vehicle exits the facility. The nozzle can be connected at the door entry when the vehicle returns, ensuring maximum exhaust capture. VSRX features a square rail that can be used in the future should the station acquire a vertical stack exhaust vehicle. applications The square rail profile in VSRX provides exceptional airflow volume to support apparatus bays in which two to four heavyduty vehicles are aligned. The crab travels outside of the rail profile, and the crab duct opens the rubber seal lips within the profile. specifications Air Volume Air volumes as high as 1400 CFM (2380 m3/h) Length of Service Area Up to 120 ft (36,5 m); square rails are 19 ft (5,8 m) in length. product data sheet Energy Efficiency • Automatic start-stop of energy-efficient fan by pressure sensor. • For multiple rails and a single fan, automatic motorized dampers turn on/off the system, reducing energy costs. Height Rail should be mounted 12 to 14 ft (3,7 to 4,2 m) from the floor. Occupational Health Benefits • Protects operators and service personnel from harmful exhaust emissions. • Operator can connect nozzle to the vehicle while standing in an upright position, further limiting exposure to harmful exhaust emissions. Facility and Vehicle Requirements • Rail length ranges from 19 to 120 ft (5,8 to 36,5 m) • Supports both drive through and back in connections. • Supports undercarriage tailpipes • Rail can be reconfigured to support vertical stack exhaust pipes, if needed • Rail profile is connected to the duct system by a 160 mm (6.3 in.) flexible hose Construction A. Aluminum square rail profile with 3.3 in. (84 mm) opening for crab; one end stop is fitted with a rubber shock absorber that prevents damage to crab and hose B. Steel crab trolley that runs externally on rail and sealed via flexible rubber lips C. on-locking spring recoil balancer N D. Upper hose E. Metal Saddle F. Mid Hose G. Safety Disconnect Handle and Lower Hose H. Magnetic Grabber®

Pressure Loss The diagrams to the right show the pressure loss at two different airflows, based on hose diameter, hose length and rail length. The pressure loss for each system may vary. Recommended Airflows: Fire truck up to 10 ltr engine: 420 cfm (720 m3/h) Fire truck up to 16 ltr engine: 630 cfm (1070 m3/h) Fire truck up to 24 ltr engine: 1060 cfm (1800 m3/h) Recommended Air Velocity: In ducting: 2000 - 3000 fpm (10 - 15 m/s) Components External Trolley The external crab trolley travels outside of the VSRX rail profile, and pulls open the sealing lips as it moves. Balancer The non-locking...