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A kitchen hood in a small apartment. A kitchen hood, exhaust hood, hood fan, extractor hood, or range hood is a device containing a mechanical fan that hangs above the stove or cooktop in the kitchen. It removes airborne grease, combustion products, fumes, smoke, heat, and steam from the air by evacuation of the air and filtration. [1]
Downdraft tables or downdraught benches are workbenches with built-in ventilation to capture dust, smoke, and fumes and draw them away from the operator and the material being worked on. [1] They typically consist of a perforated surface whose underside is connected to a ventilation or dust collection system, to draw material through the holes ...
The term "downdraft" can also refer to a type of backdraft which occurs through chimneys which have fireplaces on the lowermost levels (such as basements) of multi-level buildings. It involves cold air coming down the chimney due to low air pressure, and makes it hard to light fires, and can push soot and carbon monoxide into domiciles.
Ignition timing set to 18° BTDC, four Weber two-barrel downdraft carburetors adjusted for correct idle, choke and A/F mixture. Transmission overhauled with a refurbished clutch plate and new clutch cover, new clutch slave cylinder and clutch release bearing, missing clutch slave cylinder return spring reinstalled, new custom-made hydraulic ...
Air flow in fume hood demonstrated by dry ice fog. A fume hood is typically a large piece of equipment enclosing six sides of a work area (including a movable sash window or door), the bottom of which is most commonly located at a standing work height (at least 28 to 34 inches (71 to 86 cm) above the floor).
Even a relatively modest negative buoyancy can result in a substantial downdraft if it is maintained over a relatively large depth. A downward speed of 25 m/s (56 mph; 90 km/h) results from the relatively modest NAPE value of 312.5 m 2 s −2. To a first approximation, the maximum gust is roughly equal to the maximum downdraft speed. [16]