Thursday I stuffed the damper area and sealed off the ss liner with Roxul and stuck some on both sides of the unit not covering up any air ports , I will add the sheet metal to the block off plate shortly. Well I thought I would have to watch out for an overfire more closely because prior to adding the insulation my insert stove top would hit 600 so fast. This is not the case, It seems like more of a chore to get the stove top to 600 post insulation, I can get there as measured with the IR gun just takes more time ( 250 at reload to 600 = 40 minutes or so) I just dont get it but I really like the fact its more of a controlled burn, the unit has great secondaries and Im burning clean with no smoke, I checked the liner for holes or dents and all looks good, my liner is spic and span because I cleaned againe today and the stove acts the same. Could the insert have been drawing in too much air before? , I dont know, but I like it.