30x20 White Aluminum Modern Air Return Grille with Washable Filter (Duct Opening) RFG use the partial-open position instead

use the partial-open position instead of fully open

and design-forward areas where the diffuser should feel subtle and intentional

Duct opening size: 12" × 8" (this is what you measure)

and square ceiling openings

browse the 10x4 aluminum linear slot diffuser

30x20 White Aluminum Modern Air Return Grille with Washable Filter (Duct Opening) RFG use the partial-open position insteadFITS 30" x 20" DUCT OPENING CHECK BOTH DUCT & FACE SIZE BEFORE ORDERING: This return air grille is listed 30" x 20" by duct opening size the open hole in your wall or ceiling, not the face size. Check (1) duct opening: neck size is 29 3 4" x 19 3 4", slightly smaller than the opening for easy insertion. Make sure there is enough flat surface for a flush fit. Do not order by your old covers face size alone. See our sizing photo for all dimensions.