GTS Blast Gate View Ports are manually operated isolation devices designed to provide convenient visual access to furnaces, kilns, boilers and combustion chambers. The precision sliding gate allows operators to safely inspect flames and process conditions while helping minimize heat loss and unwanted air ingress when closed. The blast gate features a stainless steel sliding gate, swivel-mounted shaft assembly, shaft lock and leak-resistant stem packing gland for reliable operation in demanding industrial environments. Its robust construction and smooth manual operation make it suitable for regular inspection and isolation of furnace and combustion system viewing openings. When used with a suitable peep sight and high-temperature viewing glass, the GTS Viewing Port Blast Gate provides a practical solution for flame observation and furnace monitoring. The maximum operating temperature of the viewing port depends on the selected viewing glass, seals and other materials.