I read in some posts that the secondary burn's in High Efficiency fireplaces are visible and quite beautiful (as well as extremely functional). I am interested in the BIS Tradition/Lennox Motecito Estate and the VC Sequoia II. I'd like to know if the secondary burn area of these units are visible through the glass doors, or are they in some area of the firebox that can't be seen. I suspect it can't be seen in the Sequoia since its a catalytic unit, but would like to hear from anyone who owns this unit. The non-catalytic units I have more hope for since it "looks" like all non-catalytic designs are very similar internally. Naturally there are no dealers in my area that have these units on display. Thx for reading -yurij