My 30-nc is installed directly on the concrete floor of my basement, with single wall pipe to the masonry chimney, 24" straight up then a 90 then 24" into the chimney. The walls and sill are insulated but not the floor. I would like to raise the whole stove, probably with concrete block, to aid in loading and hopefully avoid a little heat loss to the floor. I don't see a spec in the Englander manual for ceiling clearance, except that the horizontal pipe must be 18" below the ceiling. Is there anything wrong with raising the stove high enough to come out of the stove with a 90 and then straight over to the chimney, would probably be 20-22 inches? Is that enough clearance from the stove to the basement ceiling, which is unfinished, just floor joists and then the first floor subflooring. Will a 90 directly out of the top of the stove adversely affect how the stove burns?