Electronic monitoring of HVAC installations for the purpose of detecting air filter clogging and providing electronic alerts of clogging and notifications regarding filter clogging status to ensure proper functioning

'air':11 'alert':17 'clog':13,19,24 'detect':10 'electron':1,16 'ensur':27 'filter':12,23 'function':29 'hvac':4 'instal':5 'monitor':2 'notif':21 'proper':28 'provid':15 'purpos':8 'regard':22 'status':25

Electronic air flow monitors, comprised of a sensor and a transmitter for measuring air filter performance; Gas flow velocity sensors; Averaging amplifiers

'air':2,14 'amplifi':22 'averag':21 'compris':5 'electron':1 'filter':15 'flow':3,18 'gas':17 'measur':13 'monitor':4 'perform':16 'sensor':8,20 'transmitt':11 'veloc':19

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