Electronic speed controls for fans, automatic level-controlling valves for water heater tanks

'automat':6 'control':3,9 'electron':1 'fan':5 'heater':13 'level':8 'level-control':7 'speed':2 'tank':14 'valv':10 'water':12

Air conditioning units and parts therefore, namely, fans, sound dampers, intake screens, back draft dampers, fire valves and shutter valves, supply/exhaust connections, air seals and ventilation ducts, electric fans for personal use, commercial ventilation fans, oven ventilation hoods, air duct heaters, and mechanically operated level-controlling valves for water heater tanks; and thermostatic valves for air conditioning/heating units

'air':1,23,39,57 'back':13 'commerci':33 'condit':2 'conditioning/heating':58 'connect':22 'control':47 'damper':10,15 'draft':14 'duct':27,40 'electr':28 'fan':8,29,35 'fire':16 'heater':41,51 'hood':38 'intak':11 'level':46 'level-control':45 'mechan':43 'name':7 'oper':44 'oven':36 'part':5 'person':31 'screen':12 'seal':24 'shutter':19 'sound':9 'supply/exhaust':21 'tank':52 'therefor':6 'thermostat':54 'unit':3,59 'use':32 'valv':17,20,48,55 'ventil':26,34,37 'water':50

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