SNO wrote:Maybe I have an odd ball, but this played heck on my burning anthracite, thinking the air in the ash pan door was only going under the grates.
I have stuffed insulation in the holes on the end plates, but I'm finding more air leakage points all over the firebox every time I clean for a new loading. Just under the front door is the second place I found air leaks, a plate I thought was solid welded was only spot welded, leaving air in.. stuffed that with insulation also.. Also found the end plates along the sides are a source of leakage also.
I feel yer pain partner, below is from a post I did a couple years ago. Those bypasses are NO GOOD for burning anthracite. THe best burn is by having independent control of both primary and secondary air. You don't want primary air to share its duty as secondary air since thru the burn cycle as ash collects on the grates, the primary will find an easier way around the coal bed.
It turns out that in the front and back of the furnace there is a gap between the inside wall of the fire box and whats called the front and rear liner. Now this gap is about half an inch wide and runs down to the ash pan area, where my combustion air enters. I thought to myself, suppose this gap is giving some of the combustion air a path of least resistance thru the fire box but totally bypassing the grates, where it should be pulled up thru to feed the coal... This bypassing air also would help cool the firebox since it wasn't helping the coal burn, hurting efficiency.
SO, as an experiement, I pushed some small pieces of fiberglass insulation into these gaps to see if it would make a difference. Now, all the combustion air entering the furnace thru the ash pan door has no choice but to be pulled up into the bed of burning coal. It has no other route to take.
Welcome to the board partner