after posting a photo of a large fire box i was thinking(OK i know its dangerous) the grate area of a up big boy is 150.3 square feet. now think of a room in your house that is 10 ft wide and 15 ft long and that's the grate area not the fire box size just the grate's.one fine train room
jim

Yep that would be a hot spot.

OK,is it just me or was there a storie about the yellowstones that when they were finished that there was a dinner party in one of the fireboxes? i swore i saw that storie somewhere but never bookmarked the site --josh