floor register trap - screen for home air vents 4"x10" - Walmart.com
Accord Select Marquis Pewter Floor Register (Duct Opening: 4-in x 10-in; Outside: 5.5-in x 11.5-in) in the Floor Registers department at Lowes.com
Contemporary Steel Floor Register - Hardware
Floor Registers, Grilles, & Vent Covers | Reggio Register
Registers & Grilles
16"x 16" Heavy Duty Solid Cast Aluminum Floor Register | Wall Vent Cover | ( Overall 17-1/2" x 18") with Detachable Steel Metal Damper
Other Large and Odd Sized Floor Vent and Return Sizes
Cast Aluminum Floor Register 4” X 10” inch | Sand Cast, Hand Crafted, Hand finished, Re-Paintable | Handcrafted Design Heat vent | Hand Finished Floor Register Cover for Home Decor| Elegant Tudor
Decor Grates | There's a grate style to match any decor