TR21-A 10 K ohm NTC non-linear Temperature Wall Module
Honeywell TR21-A | Our#: 176405
TR21-A - 10 K ohm NTC non-linear Temperature Wall Module (for averaging only)
Save Your Furnace Tip #3:
Did you know that the nominal size of your air filter is probably not the same as the actual size? Just like measurements on lumber, the actual size of an air filter is usually slightly smaller than the nominal size.