Description
The Bosch HVAC 7747021871 Glass Pane D49 5 x 5mm is a circular sight glass component used to provide visual inspection of internal operation conditions, such as flame presence or fluid flow within sealed heating equipment in HVAC systems. It is made from heat-resistant glass and designed to withstand thermal and pressure variations inside boiler or burner assemblies. Installled in furnace and heating system housings, it allows maintenance personnel to secure observe combustion or system status without opening the unit, supporting checks in residential and commercial applications.
