Run from converted garage to house is approximately 34' long with around 90 degrees of bends (2-45's minus a slight angle coming out of the garage). I'm assuming it is best to add a vertical cleanout at the garage and at the house. Is this required? As for the 18" of clearance...is this regarding access to the cleanout(s)? In other words should there be a 'clear' radius of 18" surrounding the cleanouts or am I interpreting the code incorrectly? Does a Tee do the job?