the main entrance doors are ? solid metal or wood? or glass?
the AMOUNT of use of the interior doors? maybe a grade 2 would do... bottom line, a lot of 'foot traffic' in and out, all the time, says grade 1 IMO... an 'office setting', that does NOT get walk in trade might get by with the 2... offer the customer a choice IF the traffic is light, put the grade 1 on the OS door, and 2 on the IS doors...
--Shiva-- nuk pu nuk