Profile: Zhejiang Hongyuan HVAC Parts Co., Ltd specializes in manufacturing metal stamping, injection molding, and surface finishing services. Our diverse product line includes grille, registers, diffusers, pipe hangers and plastic tubular units. Extruded aluminum sidewall diffuser is a 4 way diffuser. It features aluminum construction, opposed-blade damper, inconspicuous fingertip lever for air control, four-way air deflection and is used for sidewall or ceiling applications. Our diffusers include ceiling diffusers, floor diffusers, base board diffusers, fixed pattern diffusers, and linear bar diffusers.