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Dry scrubbers are used mainly to remove acid gases from combustion sources. Generally, this is done by introducing a series of dry reactants to exhaust gas at high speeds. This neutralizes the pollutants in the gas. This task is done in three steps: gas cooling, reagent injection, and filtering.

Diffusers are very common in heating, ventilating, and air-conditioning systems. Diffusers are used in both all-air and air-water HVAC systems, as part of room air distribution subsystems, and serve several purposes: *To deliver both conditioning and ventilating air. *Evenly distribute the flow of air, in the desired directions. *To enhance mixing of room air into…

A grille is a perforated cover for an air duct (used for heating, cooling, or ventilation, or a combination thereof). 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…

In the electrical wiring of buildings, a cable tray system is used to support insulated electrical cables used for power distribution, control, and communication. Cable trays are used as an alternative to open wiring or electrical conduit systems, and are commonly used for cable management in commercial and industrial construction. They are especially useful in…