4W-B means Four Wire, Base mounted smoke detector in Commercial
Similar to 4W-B
ACMV - Assist Controlled Mechanical VentilationACORN - Associations Of Communities Organized For Reform Now
ACOS - Adjustable Coil Over Spacer
ACP - Aerosol Collector Pyrolyzer
ACQ - Alkaline Copper Quaternary
ACR - Advanced Communications Riser
ACR - Air Conditioning / Refrigeration
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