The average linear diffuser consists of a long, narrow metal casing with a series of louvers or grills along once face. Installers fasten the linear diffuser into a ceiling, wall, or window sill area so that the louvered face sits flush with the surrounding surface. Linear diffusers work with both drywall structures and drop ceilings, but different types of models may be required to fit different applications. The most common linear diffuser designs include rows of diffusers along an entire wall, with vents placed either in the ceiling or window sills.
Traditional supply vents feature a very large, rounded design. The entire air contents of each supply duct were forced out of a single vent, creating drafts and noisy conditions. In a room with linear diffusers, the supply air is distributed through a series of narrow channels so it enters the room in several different areas at once. This creates a much more even distribution of air, as well as improved comfort and quieter ventilation.