Vent diffusers disperse pressurized air exiting heating ventilation and air conditioning (HVAC) ductwork and provide a decorative finish over the grill box hole holding the ductwork in place. Without an air diffuser, the air exiting the HVAC system would travel in a straight direction. This causes a concentration of conditioned air in one section of the room while the rest of the room remains unconditioned. The direction that a vent diffuser sends flowing air depends on the direction of the diffuser fins.
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