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Birdwell Model BFPD1400-VS Micro-FilterTM Redundant Blower Pressurization Unit 1260 CFM       These significant features assure ease of installation plus performance and serviceability... ETL certified by Intertek Testing Services to be in conformance with applicable UL and CSA codes and standards for Class I, Group C & D, Division II hazardous locations (general purpose optional). Meets NFPA 496 code requirement for 60 FPM exit velocity through one open door (1,260 CFM) Variable speed primary pressurization/purge blower and fixed speed back-up pressurization/purge blower. Remote wall mounted pressurization/purge control panel with explosion proof enclosure. Four stages of particulate and chemical filtration to meet demands of I.S.A. "G1" level and absolute 99.97 percent efficiency on 0.3 micro particles. Maintains 0.1" w.c. building pressure to prevent contaminants from entering pressurized area. Designed for low noise level, manned building application. Direct drive redundant pressurization blowers (spark resistant construction) Pressurization blower motors (3Hp) available for optional voltages (208/230/460-3-50/60). Entire unit constructed of 16 gauge stainless steel. Primary and redundant blower backdraft damper made of aluminum with stainless steel continuous type hinges. Unique "Micro-SealTM" system (patent pending) assures 100 percent filtration of air with no by-pass around chemical and HEPA filters. Unit comes standard with remote alarm relay. Optional stainless or galvanized stack with rain cap and birdscreen. Optional gas detection relay and/or stack shut-off damper/motor.   BFPD Micro-filter units are redundant blower filter/pressurization systems designed to pressurize structures to prevent the entrance of contaminated air and to remove harmful gases such as SO2 and H2S. The unit is installed with the six inch offset through an outside wall, with the unit inside the building. It is usually connected with one or more BAC or BAC-WC units. A 12" diameter safe air stack is attached to the outside of the unit and extended to a clean air source. The unit contains a prefilter, chemical filter, refilter and HEPA filter capable of filtering particles down to 0.3 microns in size. Both blowers are rated for 1260 CFM at 4.3" TSP each, with one blower being redundant. Unit options include air distributor with supply grille, stainless or galvanized steel stack with rain cap and bird screen, gas detection relay and stack shutoff damper/motor. These systems are usually used in refineries and chemical plant computer control rooms. The BFPD-VS unit is ETL certified by Intertek Testing Services to be in conformance with applicable UL and CSA codes and standards for General Purpose, Class I, Division II, Groups B, C and D and Class I, Division I, Groups C and D hazardous locations. Operating voltages available are 208/230-3-50/60 or 460-3-50/60.

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