Lennox 38M6401 38M64 Pressure Switch 1.95” Honeywell IS20195 101L5104 🔥 Checked
Honeywell IS20195 101L5104. Lennox : 38M6401, 38M64 P. Honeywell : IS20195 101L5104. This is an OEM Lennox part. It’s possible this pressure switch may also be used in those and others. After removal from the furnace, this pressure switch was checked on our workbench to confirm there was.