Is an upright sprinkler head allowed to be installed in a way where the arm over comes down off the main? For example, there is a 4” main and then the 1” arm over has a weld o let that drops down to a 2” nipple off the 4” main, then hits a 90, then there is a 4” nipple horizontally that then hits a 90 and goes up about a foot to the upright sprinkler head.
Is this acceptable? If so, is there a code reference that states this is okay? If not acceptable, is there a code reference that states this is not okay?
Im pretty sure you could have a 4” main where there are drops going down directly off of the sprinkler main to pendent sprinklers.
Many help would be greatly appreciated!