While it is a 20-inch diameter guard

zone dampers

a mechanical internal failure is likely

handling both residential and light commercial BTUH requirements

When performing a damper motor replacement

McDonnell & Miller 342500 Assembly R-410A While it is a 20-inchWhen you're servicing McDonnell & Miller Series 51 or Series 851 mechanical water feeders, the McDonnell & Miller 342500 Assembly (Model SA51 101 102) is the direct OEM replacement for a worn valve and strainer. This complete kit integrates the valve, cartridge, and strainer with the basket in a single housing, ensuring you aren't chasing small leaks or flow issues across older components. For steam and hot water applications, maintaining the makeup