Air Pollution Control Co. (APCCo)

Incomparable and Unmatched

The FGST Rooftop Unit

The FGST TM is not a part of the Hood, but rather a part of ductwork of the exhaust system As the Pumpless Fire Suppresser and Highly Efficient Grease Extractor the FGST TM  has essential differences in the concept and quality of action which are significantly improved versus the conventional systems.   While the Conventional Hoods (with Filters or Baffles) are deprived of the uniform air suction ability, the uniform airflow is the fundamental nature of the FGSTTM. The true uniform airflow guarantees that the air suction pattern is evenly spread over the cooking surfaces. The uniform air movement efficiently removes contaminants assuring the healthy and safe environment.    The FGST TM provides Continuous Washing of the Odorous and Fire Hazardous exhaust gases with Cold Water (or liquid solutions) during the entire hood system operation. The FGST TM consists of two hydraulically interconnected parts - Turbo-Impactor and Grease Separator.   The Turbo-Impactor concept implements: 1 - venturi effect at the inlet, 2 - inertial impaction of the grease-laden air on the water surface, 3 - controllable turbulent entanglement of the grease-laden air in liquid streams, 4 - centrifugal grease separation by rapid changes in air and liquid flows direction, 5 - uniform dispersion of the grease-laden air through the dynamic liquid streams, 6 - abrupt expansion (avoiding droplet eliminator).   The aerodynamic force of the exhaust fan circulates a "liquid fall grease capture process" through a zigzag shaped air-liquid passage, where odor-smoke-grease are snapped from air and trapped . To see video, please, click here Then, the liquid is to “remove entrapped flammable or combustible vapors, mists, residues, dusts or deposits to a safe location and confine and control combustible residues so that life and property is not endangered.” (NFPA-33) -  to the Grease Separator.

Fig. 1 - the fan is "on".                       Fig.2 - the fan is "off".               1. Hood       2. Grease Separator        3. Overflow funnel                4. Trapped grease   5. Water bath      6. Disposable container.   Grease drainage from Grease Separator (2) to the Disposable Container  (6) is self-performable. After the exhaust fan is turned-off, the liquid level in the Grease Separator (2) rises (Fig. 2). The top layer with heavy loaded grease overflows the Grease Overflow Funnel (5), strategically located in the Grease Separator, into the Disposable Container (6) (free standing can). Besides, there is no need to shut-off the fan to manually remove the collected grease from the Grease Collector. The rest of the liquid is remained in the system. This saves on water consumption and prevents water pollution. In addition, here is no need for grease interceptors or traps in plumbing system. As soon as the exhaust fan is turned-on again and the liquid is circulated its level in the Grease Separator drops down as it shown in Fig. 1. Thus, the grease disposal occurs each time when the exhaust fan is turned-off. Retrofit in the Existing Hood. 1. Existing hood 2. Filters removed 3. FGST ™  4   Liquid Bath 5. To Exhaust Fan      Despite of the absence of Fire Dampers, Fire suppression or Explosion protection devices, the FGST TM provides: Fire or Explosion Prevention. Around-the-clock Internal Prevention in non-operating time. The hydraulic trap, instituted by a static level of the liquid in the FGST TM, cuts out a way for the flame, smoke or fumes penetration into exhaust ducts. As a result of originality of the FGST TM there are no needs for fire dampers or sprinklers in exhaust ducts. Fire Suppression. In case of the fire (operating time), the flame will be suppressed (extinguished) by the strong liquid curtains immediately upon entry in the FGST TM . Emergency Smoke Removal. The Exhaust Systems, equipped with FGST TM, sufficiently perform the function of the Smoke Removal System. Safe Containment of hazardous impurities in the Grease Separator, remote from airflow and potential flame passage, eliminates spontaneous ignition.

1. hood 2. grease extraction baffles 3. grease gutters 4. seal plates 5. brass spray nozzles 6. drain piping 7. manual fire switch 8. automatic thermostat 9. fire seal plates 10. fire damper 11. reset handle 12. control cabinet

13. check and ball valves 14. line strainer 15. solenoid valve 16. detergent tank 17. gauges 18. stop and start buttons 19. detergent pump 20. shock absorber 21. vacuum breaker 22. cooper tubing 23. plumbing 24. sprinklers in the stack

1. FGST TM 2. Hood 3. Water Bath

 Conventional Waterwash Hood                               FGST ^TM

^{Most of grease vapors escape the filters/baffles. Grease molecules, which are heavier than air, cannot negotiate the series of baffles and adhere to the plates as air passes through the filter, creating a "bake-on" accumulation. The baffle filter operates with efficiency below 50%.}

^{As grease loads on, the airflow resistance increases and, as sequence of it, the airflow decreases drastically.}