rberq wrote:and hope that DS had practiced intelligent design rather than random creation.
I'm guessing they probably designed the secondary air to be just enough to prevent puff back at their recommended running pressure, which I think King said was -.06 ....
First, thanks to the earlier posters for pointing out something I never knew about my DS 1500. Had no idea those secondary air holes drew air from the outside--I mistakenly assumed, based on a conversation I had with someone at DS Machine that the source of that air was from under the fire...i.e., from the thermostat-controlled air intake.
When I saw the pics posted above, I looked with a flashlight through the metal mesh on the sides of my stove, and sure enough, there are the secondary air inlets.
My question: If these stoves are designed so the secondary air prevents puff-backs, why is DSM selling anti-explosion louvers? Those are the rectangular cast metal pieces that take the place of two firebricks, and have a downward-facing louver to channel more air into the firebed. DS Machine told me when I bought my stove last year they were still testing them. I was so freaked out by the pinned thread on puffbacks I went ahead and ordered a pair for around $75 for two of them.
I haven't had a puffback (yet) and assumed it was due to the louvers. Now I'm wondering if I wasted my dough, and would have been fine with the secondary air inlets as is.