These are solid heavy cast brass floor registers produced in the Victorian style. Since these are all heavy cast grates, their thickness varies
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Sidewall & Ceiling Registers at
Imperial 4-inch x 12-inch White Plastic Louvered, Floor Register
PathLSTM/lexicon/words.txt at pre-illinois-built · microth
Sidewall & Ceiling Registers at
12w X 8h Is The Size For The Duct Opening Measurement Only, Actual Front End Outer Dimensions Are 13.75 Width X w X 9.75 Height - SEE BELOW IN
12w X 8h Steel Return Air Grilles - Sidewall and Ceiling - HVAC Duct Cover - White [Outer Dimensions: 13.75w X 9.75h]
These are solid heavy cast brass floor registers produced in the Victorian style. Since these are all heavy cast grates, their thickness varies
Brass Grille Vent Register for Floor Wall or Ceiling: IS 9.75 X 11.75; OS 12 X 14 (ZM-1912)
14w X 8h Is The Size For The Duct Opening Measurement Only, Actual Front End Outer Dimensions Are 15.75 Width X w X 9.75 Height - SEE BELOW IN
14w X 8h Steel Return Air Grilles - Sidewall and Ceiling - HVAC Duct Cover - White [Outer Dimensions: 15.75w X 9.75h]
Magnus Home Products - Solid Brass Air Register
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9x 12 Heavy Duty Solid Cast Aluminum Floor Register