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Category: Control Devices

Control Devices

Return grille sound requirement

Posted on June 4, 2019June 9, 2019 by admin

Return air grilles should be selected for static pressures. These pressures will provide the required NC rating and conform to the return system performance characteristics.…

Control Devices

HVAC Controlling Casing Noise

Posted on June 3, 2019June 9, 2019 by admin

Terminal boxes can sometimes be located over noisy areas (corridors, toilet areas or machine equipment rooms), rather than over quiet areas. In quiet areas casing…

Control Devices

Types of Registers and Grilles

Posted on June 1, 2019June 9, 2019 by admin

The spread of an unrestricted air stream is determined by the grille bar deflection. Grilles with vertical face bars at 0° deflection will have a…

Control Devices

HVAC Air Noise

Posted on June 1, 2019June 9, 2019 by admin

High velocities in the duct or diffuser typically generate air noise. The flow turbulence in the duct and the excessive pressure reductions in the duct…

Control Devices

HVAC Vortex Shedding

Posted on May 30, 2019June 9, 2019 by admin

Product research in controlling casing noise has developed a new method of reducing radiated noise. The technique is known as vortex shedding. When applied to…

Control Devices

HVAC Fire and Smoke Dampers

Posted on May 27, 2019June 9, 2019 by admin

Ventilating, air-conditioning, and heating ducts provide a path for fire and smoke, which can travel throughout a building. The ordinary types of dampers that are…

Control Devices

HVAC Pressure Requirement

Posted on January 27, 2011November 4, 2012 by admin

The diffuser or grille minimum pressure for a given air volume reflects itself in ultimate system fan horsepower requirements. A diffuser or grille with a…

Control Devices

HVAC Throw Requirement

Posted on January 27, 2011November 4, 2012 by admin

Throw and occupied area air location are closely related. Both could be considered in the analysis of specific area requirements. The minimum maximum throw for…

Control Devices

HVAC Air volume requirement

Posted on January 27, 2011November 4, 2012 by admin

The air volume per diffuser or grille is that which is necessary for the cooling, heating, or ventilation requirements of the area served by the…

Control Devices

HVAC Air-flow distribution

Posted on January 27, 2011November 5, 2012 by admin

Bottom or side outlet openings in horizontal or vertical supply ducts should be equipped with adjustable flow-equalizing devices. Figure 17-6 indicates the pronounced one-sided flow…

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