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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]
Energy costs for a typical hood can range from $4,600/year in Los Angeles to $9,300/year in Singapore based on differences in cooling needs. [30] The bulk of the energy that fume hoods are responsible for is the energy needed to heat and/or cool air delivered to the lab space.
Figure 1: Components of a centrifugal fan An external motor belt driven inline centrifugal fan discharging inline to the exterior of a building through a duct. Unlike non-inline/non-concentric impeller casing design with a cutoff blade above, the concentrically symetric cylinder casing and impeller geometry of inline type redirects the outflow around so that it is parallel to the inflow of gases.
It is intended to help the designer quickly narrow the range of possibilities and understand the impact of shading devices in commercial office buildings during the early stages of design. Fan Acoustics - Noise Generation and Control Methods by Alain Guédel discusses the sources of noise generation in fan construction and system installation.
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Duct slopes level to 30 degrees, 25% of cross section. Duct slopes, 30 degrees to 45 degrees, 15% of cross section; Duct Slopes, 45 degrees to 85 Degrees, 5%; Above 85 degrees, a 2 in (50 mm) interior coating of dust. These loads are always confirmed with the client, before use, but the above in US common practice