OEM Lennox Armstrong Ducane Furnace 2″ Limit Switch Replaces 20001103 L170-40F
20001103 – OEM Lennox Armstrong Ducane Furnace 2″ Limit Switch L170-40F. The Lennox/Armstrong/Ducane part # is 87H91 (also 20001103). Replaces Old Part #s Hit Ctrl+F and enter your model number for a quick search!