A fire suppression apparatus including a variable aeration mixing rate nozzle and a method for generating a foam discharge at a variable aeration mixing rate nozzle. A voltage at an error amplifier of a VCM driver is accessed. The buried bit lines are formed of epi-silicon to reduce the resistance of the buried bit lines. In an alternative embodiment, the hot discharge gas is input through the bottom of a shell and tube condenser and then exposed to the cool liquid refrigerant in the condenser.