Hi All Am a newbie. After struggling for several months w/ dealer(s) to agree to install unit into existing LENNOX pre-fab, finally just got an ENVIRO M55 insert installed yesterday (see attached image - support under stove was my handy-work) without modifying existing fireplace! Burned for better part of the day & night! Am very pleased... so far w/ investment! Bought a ton o' O'Malley premium pellets from dealer along w/ stove. I was skeptical about the quality of the pellets but after one day of burn, there's very little ash and good amount of heat so am pleased w/ both stove and fuel. Have few follow on questions for M55 [FPI] users... 1) Owner's manual explains how to change feed and air trims BUT it does not explain what they're for and how/when to use/change. Can someone pls explain what exactly they do? I surmise (combustion) air trim adjusts intake of combustion air but how is that different from intake slide? Is it just a 'fine' adjustment? 2) What exactly does the 'feed' trim do? How is it different from setting the heat level which determines the rate at which pellets are dropped into the burn pit? 3) I assume there is no way to increase the blower rate through the heat exchanger. Correct? And lastly... 4) I have the fuel type set to "premium", heat level set to "3" on manual mode. I went through ~40lbs of fuel in ~18 hours I was under the impression that under nominal/moderate settings the unit would/should burn ~24 hours w/ 40lbs of fuel. What can/should one expect in terms of burn rate with these settings? Since the stove is on manual mode, I imagine the burn rate is independent of environmental conditions and fuel quality. Thanks in advance Warm 'n Cozy in Annapolis!