two-stage air filter
1Forced-air — A Forced air or Warm air heating system is one which uses air as its heat transfer medium. These systems use ductwork and vents as a means of air distribution. The return plenum carries the air from several large return grills (vents) to a… …
2Mechanical filter — Figure 1. A mechanical filter made by the Kokusai Electric Company intended for selecting the narrow 2 kHz bandwidth signals in SSB radio receivers. It operates at 455 kHz, a common IF for these receivers, and is dimensioned 45×15×15 mm ( …
3Polarizing filter (photography) — Circular polarizer/linear analyzer.[1] filtering unpolarized light and then circularly polarizing the result. The polarizing filter used with most mo …
4List of United States Air Force Academy alumni — Traditional hat toss and flyover by Air Force Thunderbirds at the graduation ceremony at the United States Air Force Academy …
5Dust collector — Two rooftop dust collectors in Pristina, Kosovo A dust collector is a system used to enhance the quality of air released from industrial and commercial processes by collecting dust and other impurities from air or gas. Designed to handle heavy… …
6environmental works — ▪ civil engineering Introduction infrastructure that provides cities and towns with water supply, waste disposal, and pollution control services. They include extensive networks of reservoirs, pipelines, treatment systems, pumping stations …
7Supermarine Spitfire (late Merlin powered variants) — Infobox Aircraft name =Spitfire type =Fighter manufacturer =Supermarine caption =Supermarine Spitfire VIII in the markings of 457(RAAF) Sqn designer =R. J. Mitchell first flight =5 March 1936 introduction =1938 retired =1955, RAF status = primary …
8Supermarine Spitfire (early Merlin powered variants) — Infobox Aircraft name =Spitfire type =Fighter manufacturer =Supermarine caption =Spitfire Vc launching from USS Wasp designer =R. J. Mitchell first flight =5 March 1936 introduction =1938 retired =1955, RAF status = primary user =Royal Air Force… …
9Gas turbine — Microturbine redirects here. For turbines in electricity, see Small wind turbine. For turbines driven by the flow of gas, see Turbine. A typical axial flow gas turbine turbojet, the J85, sectioned for display. Flow is left to right, multistage… …
10Microphone — For the indie film, see Microphone (film). Microphones redirects here. For the indie band, see The Microphones. A …
