National Geographic : 1962 Mar
HANDSOME CONTROL PANEL in living area shows air cleaner is working at peak efficiency, signals when it needs cleaning. System installs easily with little interruption of heating or cooling. EASY TO CLEAN. Three or four times a year usually is enough. Surprisingly, system uses no more current than a 40-watt bulb. System is backed by Honeywell, home comfort leaders for more than 76 years. New whole-house Honeywell Electronic Air Cleaner traps the tiny bits of grime that ordinaryfilters miss Guaranteed by ' GoodHousekeeping '4"