regulation box filter

band-pass filter / bandpass filter (BPF)

dust filter / dust shield, particle filter

dust shield / dust filter, particle filter

filter housing / filter unit

filter unit / filter housing

particle filter / dust shield, dust filter

finite impulse response filter (FIR-filter)

passband filter; bandpass filter (BPF)

Federal Aviation Regulation (FAR)

conflict regulation

distant regulation

division traffic regulation headquarters

highway regulation and control

highway traffic regulation headquarters

Paris Convention for the Regulation of Aerial Navigation

air transport regulation panel

international air transport regulation: present and future

state regulation

regulation

Air Force Regulation

air filter

filter-separator

fuel filter

gas-particular filter unit (GPFU)

home-made face filter

individual portable filter

oil filter

RF interference filter

filter stack

military-grade filter

slave oil filter

bag filter