These fans may be set up to run in either “pusher” (in front of the radiator) or “puller” (behind the radiator) configuration. The 10” fan requires a clear mounting area of at least 10 5/8” x 11 1/8”, while the 12” requires at least 11 1/2” x 12 1/2”, 14” fans are also available. We suggest the 12” fan for Triumph TR2 thru TR4A, the 14” fan for TR250/6, and the 10” fan for all other British sports cars we sell parts for. Both fans come complete with hardware and instructions. The preset temperature control will turn the fan on at 185°F and off at 170°F.