Imperial RG0189 Floor Register, 3-1/2 in L, 15-1/4 in W, Steel, Brown

All-steel construction. Widespread air diffusion. Easy to operate damper control. Rolled fin for strength and safety. Measure the length and width of the opening. Subtract 1/8 to 1/4 in (depending on how square the opening is) and this is the inside dimensions. Painted metal registers have a durable powder-coat finish.