From my recollection, B&M recommends shutting down below 40, Verbolten was 36, Mach Tower and LNM were 32 (These were the major rides that were there while I worked there). Park instructed us to B-Call the supervisor every time the temp dropped a degree starting at 5 degrees above the shutdown temp. Immediately stop loading as soon as the shutdown temp was reached. As to Intamin's shutdown temps, I don't know. BGW pretty much follows almost every recommendation from the manufacturers, so whatever Intamin tells them as a lowest operating temp, I'm sure they will follow. If there is anyone from KD or a CF park on here that knows what Intamin recommends, please let us know.