Pneumatic controllers for air conditioning units; zone control systems for home heating and air conditioning comprised 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

'air':4,14,42 'close':30 'compris':16 'condit':5,15,43 'connect':22 'control':2,8,25,37,40 'damper':34 'electr':35,39 'heat':12 'home':11 'humidifi':36 'open':28 'panel':26 'pneumat':1 'seri':19,32 'system':9 'thermostat':21,38 'unit':6,44 'zone':7

Air cleaners and purifiers for residential and commercial use, incorporating an air filter and accompanying housing

'accompani':15 'air':1,12 'cleaner':2 'commerci':8 'filter':13 'hous':16 'incorpor':10 'purifi':4 'residenti':6 'use':9

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