i just bought a fisher mama bear. the plate on the back has been sanded so i cant read if it is listed as UL,CSA, or WH ? i was told it was UL listed. the pat no. is D 237798 . there is also a stamped number just above the door 808 71. how can i find out if it is listed to let my homeowners know. i fear that only the arched door models are. thx