3003 W CASINO RD BLDG 45-01 2018-01-01 MF Import

45-01 PAINT HANGAR UPGRADE CITY OF EVERETT MEETING OCTOBFR 16, 1995 SMOKE VENTILATION Smoko ventilation is presently in the upgrade design. Smoke ve;itilation was included in order to meet the intent of present code requirerr,ents for a new building. After development of the design details it has been determined that smoke ventilation combined with a deluge fire sprinkler system will not function properly. The coolinp effect of the sprinkler water will drive the smoke to the hangar floor hence preventing proper removal through and overhead ventilation system. A more functional solution is to allow opening of the hangar doors by the fire fighters for smoke ventilation. The doors are powered on emergency power and will be manually operated from the exterior of the building. The process ventilation system also has a feature for fire fighter operation. If necessary, the system can be set to exhaust mode to help evacuate smoke from the han�ar iloor. This design option has been developed with Boeing Fire Protection Engineering and the Boeing Fire Department. 45-01 and 45-03 hangars are not equipped with smoke ventilation presently. Airplanes placed in the 45-01 for painting are not fueled or have fuel cells drained and with an inert cover gas. As a result, the amount of fuel present in the hangar is limited to painting materials. This is a small fuel load which would give a flash fire with limited smoke generation. Functions where fueled airplanes arA in the hangar are limited to weights and measures and no maintenance or exchange of parts. The hangar doors are kept open during these operations. in summar�we request concurrence to revise the design to eliminate the smoke ventilation system from the hangar upgrade design. Fire flghter r.ianual operation of the doors will be used if required for smoke ventilation. �