In steel and etched "glass", the extractor is available in four different size combinations.  It comes in two widths, 2"(5cms) and 3" (7.5cms) and two heights, 2"(5cms) and 4"(10cms).  The 2" high version is specifically for use with EAZY wall units, as it will sit under the continuous top.

Width  2ins (5cms) 3ins (7.5cms)   Height  2ins (5cms) 4ins (10cms)