11 Air cleaners incorporating an air filter and accompanying supportive housing for household use; air filters for heating, ventilating, air conditioning, and kitchen exhaust systems; humidifiers; panel-type grease filters for air ventilating systems; filtering elements for the removal of entrained solid and liquid particles from gases in engine air intake cleaners, and for sundry uses, as in air vents, paint spray booth air discharges, and the like; wettable air pervious filter-like material for treating ventilating air; evaporative coolers and air washers; evaporative coolers for residential and commercial use; air filter panels, being part of air filtering units; household air cleaners, namely, uv germicidal lamps; parts for air cleaning system, namely, filter for air filter unit, water panel for humidifier and lamp for uv lamp; dehumidifiers, air cleaners and purifiers for residential and commercial use, incorporating an air filter and accompanying housing; heat recovery ventilators for heating and cooling applications; porous pad evaporators used in humidifiers; apparatus for humidifying ventilating air; fresh air exchangers for cleaning and purifying air for use in residential and commercial forced air heating and air conditioning systems; electrically powered heat exchangers, not being parts of machines for residential use; wettable air filters for air conditioning for filtering, humidifying and ventilating air in domestic and commercial applications; Radon mitigation devices and systems comprised of ventilators for radon mitigation