Benchmark 4000 and 5000N The only 4000/5000 MBH boiler that can fi t in a freight elevator With AERCO's Benchmark 4000/5000N, you'll still SAVE time and money by reducing install, startup and operating costs; SIMPLIFY startup and maintenance; and STRENGTHEN system performance and effi ciency...but now you can fi t all 4000/5000 MBH in a freight elevator and through a standard 36 " doorway. More power in a small footprint. 800.526.0288 | aerco.com ©2022 AERCOhttps://www.aerco.com/products/hvac-hot-water-solutions/boilers/benchmark/benchmark-4000-and-5000n?utm_source=ashrae&utm_medium=digitalprint&utm_campaign=2022052022-na-aerco-BMK45000-issue+may&utm_content=fullpg4c