Humidifiers; Pneumatic controllers for air conditioning units; Zone control systems for home heating and air conditioning comprising of a series of thermostats connected to a control panel which opens and closes a series of dampers; Electrical humidifier controls; Thermostats; Electrical controllers for air conditioning units" in Intl. Class 9 and "Air cleaners and purifiers for residential and commercial use, incorporating an air filter and accompanying housing; Fresh air exchangers for use in residential and commercial forced air heating and air conditioning systems; Heat recovery ventilators for heating and cooling applications; electrically powered heat exchangers for residential use; Porous pad evaporators used in humidifiers; Evaporative coolers for residential and commercial use; Wettable air filters for filtering, humidifying and ventilating air in domestic and commercial applications