This diffuser has a combined shape of curved pyramidal sides . This product replaces two 2'X4' standard drop ceiling tiles but can be wall mounted and fabric covered or painted to match your facility's decor.Pyramidal Diffusers are custom engineered and vacuum molded of high-impact styrene. The Pyramidal Diffusers diffuse and help diaphragm low frequencies. These Diffusers can be ceiling or wall mounted and fabric covered or painted.