Pneumatic controllers for air conditioning units; zone control systems for indoor agricultural heating and air conditioning comprising of a series of thermostats connected to a control panel which opens and closes a series of dampers; electrical controls for humidifiers; thermostats; electrical controllers for air conditioning units; control panels for controlling indoor agricultural heating, air conditioning and air cleaning and purification systems

Dehumidifiers, humidifiers, air cleaners and purifiers for indoor agricultural use, incorporating an air filter and accompanying housing; fresh air exchangers for cleaning and purifying air in indoor agricultural forced air heating and air conditioning systems; heat recovery ventilators for heating and cooling applications; electrically powered heat exchangers not being parts of machines for indoor agricultural use; porous pad evaporators used in humidifiers; Evaporative air coolers for indoor agricultural use; air humidifying apparatus with ventilating fans for industrial purposes; UV germicidal lamps for purifying air; UV lamps not for medical purposes