By opting for a permanent furnace filter

ensuring the furnace pressure switch closes to initiate the ignition sequence

For technicians performing a Heil furnace repair

this specific 105 model is optimized for the ML6420/6425 and ML7420/7425 footprint

Lennox 69M79 Motor 30067439-890 By opting for a permanentThe Lennox 69M79 is a heavy duty, 1 HP direct drive blower motor engineered for high static residential and light commercial furnace applications. Operating at 115V single phase power, this Permanent Split Capacitor (PSC) motor delivers a reliable 1075 RPM across 4 speed taps, allowing for precise airflow balancing during both heating and cooling cycles. As a direct OEM replacement for 69M7901 and Nidec K55HXLDY 9962, it features a standard 48 frame