SURS Series Blower Silencers Are Heavy-Duty, All-Welded Steel Construction, Suitable For Either Inlet Or Discharge Applications. The SURS Series Is Designed For Application To Blowers Operating Above Critical Transition Speed. As A Result, There Is No Acoustical Packing In These Silencers. These Silencers Incorporate A Unique High Performance, Three Chamber System Which Utilizes A Diffuser On The Blower Side Of The Silencer. The SURS Series Provides Excellent Pulse Control, And Is Designed For The Most Demanding Conditions, In Particular For Applications That Do Not Utilize Any Acoustical Packing Material. Connection Sizes Smaller Than 4″ Are Provided With Standard NPT Male Pipe Nipples. Silencers With Connection Sizes Of 4″ And Larger Have 125/150# ANSI Drilled Plate Flanges. The SURS Is A Basic End-In, End-Out Configuration. A Low Side Inlet Version Is Available As The SURSY Series. Both The SURS And SURSY Versions Are Similar In Gas Flow Path Offering Identical Performance. The SURS And SURSY Series Silencers Exterior Surfaces Are Coated With A Single-Coat Aluminum Paint Rated For 1000°F. Other Paint Systems Are Available Upon Request. Please Note All Side Inlet Designs Have Dual Drains.