12x4 White Premium Aluminum Linear Slot Diffuser – Modern Design (Duct Opening) 4 Slot If the opening is approximately

If the opening is approximately 10" × 10"

choose a dedicated 10x4 air return grille with pre-filter instead

paired openings

Multi-directional adjustable damper — left

and no remodeling

12x4 White Premium Aluminum Linear Slot Diffuser – Modern Design (Duct Opening) 4 Slot If the opening is approximatelyCHECK SIZE BEFORE PURCHASE: This 12x4 linear slot diffuser fits a 12" 4" duct opening (the hole in your wall, ceiling, or floor not your old cover face). See the full 12x4 sizing guide Fits a 12" 4" duct opening measure the hole, not your old cover face. Drop in surface mount replacement no drywall, flooring, or duct modification required. Modern minimalist slot design for contemporary interiors and cleaner visual lines. Solid alloy aluminum rust