The ultratherm mats are UL listed - I've used them and the T-Rex Cobra (same thing) mats for years.
As for the Fusion racks - I got to see the 450 in person a few weeks ago and was impressed. It's a nice system, with a smooth feel and those 47x28 tubs are very clean.
As for using steel racks in general - I've used Boaphile, AP and Freedom Breeder. Next time I buy a rack, it will be a FB (close to me - no shipping charges). I've found that the extra dough is well worth it for a quality piece of equipment.









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