An interceptor that replaces a trap must be vented in the same way as the trap it replaces. (See Note A-7.4.2.1.(1)(a)(ii) and (e)(vi)) Where an interceptor other than an oil interceptor serves a group of fixtures requiring more than one trap, each fixture must be properly trapped and vented. (See Article 7.5.5.2. for venting of oil interceptors.)