Gas-heated Furnace With Combustion Air Blower
March 5, 2014
The No. 862 from Grieve, Round Lake, Ill., is a gas-heated, 2,000F (1,093C) furnace currently used for preheating molds. Four modulating natural gas burners with a floor-mounted combustion air blower are capable of 750,000 BTU/hr. Workspace dimensions are 36 x 48 x 36 in.
The unit has insulated walls composed of 5-in. 2300F ceramic fiber and 2-in. block insulation. The 7-in. floor insulation includes 4.5 in. of 2,300F (1,260C) firebrick and 2.5 in. of block insulation. Controls onboard the No. 862 include an automatic door switch to drive burners to low fire when the door is opened and an air-operated vertical lift door. Safety equipment required by the Industrial Risk Insurers, FM Approvals LLC and the National Fire Protection Association’s standard 86 for gas-heated furnaces is also included.