4W-B means Four Wire, Base mounted smoke detector in Commercial




Similar to 4W-B

ACES - Advanced Concept Ejection Seat
ACF - Activated Carbon Filter
ACFC - Air Cooled Flooded Chiller
ACFH - Animal Chatter Farm - Horse
ACFMS - Airframe Cumulative Fatigue Monitoring System
ACFX - Air-Cooled Flooded Chiller
ACFZ - Arctic Cooling FreeZer

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