Description
The Reznor RZ112754 M/R Blocked Vent Limit Switch is a temperature safety control designed to monitor venting conditions in HVAC systems. Rated for a 175F limit setting, the switch responds to excessive heat caused by restricted or blocked vent airflow by interrupting the operating circuit during furnace operation. It is commonly installed in gas-fired heating equipment where vent safety monitoring is required to support controlled combustion and protect internal components from overheating conditions. Within the heating assembly, the limit switch operates as a protective control part that supports vent monitoring, thermal shutdown response, and coordinated furnace safety operation.
