12" x 12" [Duct Opening] Flat Plaque Aluminum Ceiling Supply Diffuser Duct Cover with Lever-Operated Damper for Air Flow Control [Outer Dimensions: 15" x 15"] Sheet Metal Fittings you may now order this

you may now order this galvanized sheet metal end boot for a reasonable price

+ Product Details Size – 24" Corner Baseboard Grille - White - HVAC corner vent cover

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+ Product Details Size & Compatibility – The 7" round quadrant volume damper is compatible with duct 7"

12" x 12" [Duct Opening] Flat Plaque Aluminum Ceiling Supply Diffuser Duct Cover with Lever-Operated Damper for Air Flow Control [Outer Dimensions: 15" x 15"] Sheet Metal Fittings you may now order this+ Product Details Size Refers to duct opening only. The face frame extends roughly 1. 5" on each side. Do not measure the overall grille for sizing. Design All aluminum frame and back blades. Rustproof and built to last in moisture prone environments. Quiet Airflow Opposing blade damper design reduces vibration and noise for smoother air distribution. Clean Finish White powder coated surface resists chips, scratches, and discoloration over time. Easy