ASHRAE Terminology

two fans connected to a combustion unit, one to supply the combustion air and the other to induce draft.

series of air-directing vanes (usually adjustable) that are used to direct and/or control the combustion airflow through the burner.

device to introduce secondary combustion air into the furnace in a 360° pattern around the flame and, with an ignition cone, to cause accelerated vaporization of the oil.

air required to provide for the complete combustion of fuel and usually consisting of primary air, secondary air, and excess air.

(1) adjustment of the fuel rate and air/fuel mixture ratio in response to heating load and flue gas air condition over the full range of the burner capacity from some preset minimum to 100%. (2) device or series of devices that control the flow of fuel and combustion air in the desired ratio to provide efficient combustion.

combustion air supplied under pressure to the fuel-burning equipment. Compare to induced draft, natural draft.

simple cycle gas turbine to which has been added a heat exchanger to warm incoming combustion air with heat from exhaust gases in order to increase thermal efficiency.