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Carnation

Heating - Wooden Air Grate

Accord AORGOLL126 Oak Return Grille, 12-Inch x 6-Inch Light finish 

Wooden Air Grate 

https://smile.amazon.com/gp/product/B00EIII4EY/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=ATVPDKIKX0DER        $17.70

 

Another possibility is...
Decor Grates WL612R-U 6-Inch by 12-Inch Wood Return Air, Unfinished Oak

 

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