Ceiling Grille - 3 Cone Step Down Diffuser - 12" x 12" - 8" Collar Return this thermostat guard is compatible

this thermostat guard is compatible with most standard thermostat models

+ Product Details Size – 22"w X 12"h is the size for the duct opening measurement only

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actual front end outer dimensions are approximately 18 5/8" width X 28 5/8" height

or commercial environment

Ceiling Grille - 3 Cone Step Down Diffuser - 12" x 12" - 8" Collar Return this thermostat guard is compatible+ Product Details Size 12"w X 12"h. These are specially sized to fit into all drop ceilings, 24"x 24", also called T Bar systems. Can be hooked up with our "Butterfly Dampers" for precise airflow control. For 8" Round Duct Opening Spiral or Flex Powder Coat Finish Smooth, shiny, scratch resistant, beautiful. Looks like it was just waxed Heavy Gauge Steel Heavier gauge than needed, built for durability and long life in mind, but still very thin