Ashtray

Cab engine air intake system and method

Carburetor chamber cover device

Clean room adapted for variable work area configurations

Clean room filter assembly

Clean room having partially different degree of cleanliness

Clean room head assembly

Clean room with replaceable filter and a seal cutting mechanism

Compressor system

Decontamination system

Diffuser with replaceable filter

Engine compartment and air cleaner

Filter for ostomy bags

Filter unit on equipment requiring ventilation free of dust and

Flask and mechanical aerator

Fume hood with modular blower and filter assembly

HEPA room air purifier

Laminar flow clean room having improved filter bank

Means for intercepting weld splatter

Medical liquid container with filter vent