Bazooka heaters are also known as forced-air gas heating systems are used in central air heating systems for Houses/Halls of the commercial institutions. Sometimes the system is referred to as “forced hot air”. A forced-air central heating system is one which uses air as its heat transfer medium. These systems rely on ductwork, vents and plenum as means of air distribution, separate from the actual heating and air conditioning systems. The return plenum carries the air from several large return grills (vents) to a central air handler for re-heating. The supply plenum directs air from the central unit to the rooms which the system is designed to heat. Regardless of type, all air handlers consist of an air filter, blower, heat exchanger / element /coil, and various controls. Like any other kind of central heating system, thermostats are used to control forced air heating systems. These are very force ful heaters.