Stratus Tan/Beige Plastic 2'x2' CONE Air Diffusers by American Louver are made with collars from 6" to 14" (backplate included). Ideal for restaurants, hospitals, MRI rooms, dishwashing rooms, office buildings and clean environments. Fits in a 2'x2' ceiling grid system. *Durable ABS material. *Will not rust. *Will not chip or bend (colorant molded into part). *Resists sweating (reducing dust buildup). *Easy to clean. *No Sharp Edges *2" tall neck (for easier connections) *6", 8", 10", 12", 14" collar sizes *Available in Black Plastic and White Plastic *OD= 23-3/4" x 23-3/4".