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2. Register (air and heating) - Wikipedia

   en.wikipedia.org/wiki/Register_(air_and_heating)

   Grilles sometimes have louvers which allow the flow of air to be directed. A register differs from a grille in that a damper is included. [1] [2] However, in practice, the terms grille, register, and return are often used interchangeably, and care must be taken to determine the meaning of the term used. [2] [3]

3. Grille (architecture) - Wikipedia

   en.wikipedia.org/wiki/Grille_(architecture)

   A wooden window grill in Plaza del Conde del Real, Valencia ().The structure was probably used as a stable. Grille, and control for an air duct. A grille or grill (French word from Latin craticula, small grill) is an opening of several slits side-by-side in a wall, metal sheet or another barrier, usually to allow air or water to enter and/or leave and prevent larger objects (such as animals ...

4. Air-mixing plenum - Wikipedia

   en.wikipedia.org/wiki/Air-mixing_plenum

   Air streams are mixed to save energy and improve energy efficiency by partially recirculating conditioned air.. The most common application for an air-mixing plenum is the mixing of return air (or extract air) with fresh air to provide a supply air mixture for onward distribution to the building or area which the ventilation system is serving. [1]

5. Bell mouth - Wikipedia

   en.wikipedia.org/wiki/Bell_mouth

   A bell-mouth inlet duct is a form of convergent inlet air duct used to direct air into the inlet of a gas turbine engine. The area of a convergent duct gets smaller as the air flows into the engine. A bell-mouth inlet duct is extremely efficient and is used where there is little ram pressure available to force the air into the engine.

6. Perforated metal - Wikipedia

   en.wikipedia.org/wiki/Perforated_metal

   Studies have shown that perforated metals help reduce sound levels. [4] Studies have shown that having buildings use perforated metal sheets in front of their façade can bring in one study 29% energy savings (HVAC + Lighting estimated consumption in 1 year) and in the second one 45% energy savings (heating, ventilation, air conditioning).

7. Cadillac Eldorado - Wikipedia

   en.wikipedia.org/wiki/Cadillac_Eldorado

   New up front was a bi-angular grille that formed a V-shape along both its vertical and horizontal planes bisected by a central body-colored horizontal bar. Outer grille extension panels again housed the parking and cornering lamps. It was the 17th consecutive year for the Cadillac tailfins with a new fine-blade design carrying on the tradition.