Please look over the pictures and ask questions when needed. Measures approx: With surround 27 1/8" X 23 1/8", would need a 24 3/4" X 20 3/4" opening, Without Surround 22 3/8" X 18 1/8", would need a opening of 20" X 16".The item "Very Large Antique Cast Iron Floor Heat Grate Register 28 X 22 Old 3797-14" is in sale since Thursday, October 16, 2014. This item is in the category "Antiques\Architectural & Garden\Hardware\Heating Grates & Vents". The seller is "nysalvage" and is located in Oneonta, New York. This item can be shipped to United States, to Canada, to United Kingdom, to Australia, ZA, to Ireland, to Mexico, to New Zealand, SG, AE, MY, DK, RO, SK, BG, CZ, FI, HU, LV, LT, MT, EE, GR, PT, CY, SI, to Japan, SE, KR, ID, to Taiwan, to Belgium, to France, to Hong Kong, to Netherlands, PL, to Spain, to Italy, to Germany, to Austria, IL, PH, NO, SA, UA, QA, KW, BH, HR, TR, CL, CO, CR, PA, TT, GT, HN, JM.