Patent ID: 8662885
Filing Date: 2014-03-04
Classification: F23N

Abstract:
1. A furnace system that generates heat by combustion, the furnace system comprising: a sensor that detects a gas concentration of a flue gas, said sensor being positioned in a flue elbow in communication with said flue gas, said sensor generating a sensor signal, the sensor having a filter cap for providing insulation to said sensor; a controller in communication with said sensor, said controller monitoring said gas concentration; a baffle plate directing a first portion of said flue gas into contact with said sensor and a second portion of said flue gas in a direction away from said sensor; and a draft safeguard switch port located in the elbow having a draft safeguard switch that selectively permits dilution air to enter the furnace system to mix with said first portion of said flue gas; wherein said baffle plate connects to a flue elbow forming a baffle inlet between said baffle plate and said flue elbow upstream of said sensor and forming a baffle outlet between said baffle plate and said flue elbow downstream of said sensor.