in 1998 my plumber on my new house used a 1/4 bend at the bottom of my toilet drop(approx 24 inch drop)before it turns horizontal. I am redoing the bathroom and rough in could be simpler if I reused this transition but in NH under IPC it appears to me this should have been a long sweep elbow. This is a 3 inch ABS pipe. Could the requirements have been different under IPC in 1998 or did my plumber not do it right to begin with?