This Flue Guard from Navien is an accessory designed for use with Navien’s LCB External Boilers, which are oil condensing boilers intended for outdoor installation. The primary function of the flue guard is to enhance safety and protect the flue terminal from external elements and potential obstructions.

The flue guard helps protect the flue terminal from adverse weather conditions, such as rain, snow, and wind, which can affect the performance and safety of the boiler.

It also prevents debris, leaves, and animals from entering the flue terminal, which could cause blockages or other issues affecting the boiler’s efficiency and safety.