Ventilation. Hood. Umbrellas. Tinker. Tin shop. Inflow.

A short list of vents. parts of round and rectangular section that I can offer you: - straight air ducts - bends - tees - mixing "ducks" - couplings and sleeves - transitions - exhaust hoods - adapters for air conditioners and grilles - flexible connectors - damper and damper throttle - check valves - gravitational valves - silencers - duct filter boxes cassette, sleeve, grease trapping I will also consider the possibility of manufacturing non-standard parts according to your drawings.