Water column measurement

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New Member
Nov 24, 2021

New to the forums here. I have an enviro p3 pellet stove. Stove runs great but getting the water column reading seems to be a struggle. I have a manometer set to inh20 setting, and regardless if I have the stove on 5 or 1 the reading is the same. Is that normal. Or should it drop down on the low setting?