Universal Scaffold & Equipment's Boiler Scaffold Ladders are 13.75" Wide with rung spacing every 12" for optimal access capabilities. With a narrower range than the standard 17" wide scaffold ladders, boiler ladders can provide access in tighter areas than other types of ladders available. Boiler Scaffold Ladders are interconnected and attached to the scaffolding by use of a clamp-on scaffold ladder bracket. The 13.75" wide access ladders come in lengths of 3', 5' & 10' lengths so you can reach the needed heights required to complete the job. The Boiler Ladders are fully hot-dip galvanized. Universal's ladders meet and exceed all requirements from OHSA and ANSI standards.