Whole house humidifier, manufactured by Research Products Corp. The Model 400 bypass humidifier offers the flexibility of easy installation on either warm air supply or cold air return on any forced air furnace. This model incorporates a special humidifier filter that wicks the water up while a drip system sends the water down. Designed for use where drain facilities are not available. Comes with the digital AutoTrac control system. This system is so advanced it raises and lowers the humidity set point as the weather changes for optimum comfort.

* Calculations based on (1) 20?F. and 70% R.H. Outside Air. (2) 70?F. and 35% R.H. Room Air. (3) Internal Moisture Gain of 1lb./hr. (4) 70% Blower Operation. (5) 8 ft. ceiling height.