sorry bob

didn't mean to ignore your question----again everything was within code-on this wh--bvents----we have alot of low clearence crawl spaces here----and the mini mits--lo boys are all they can use-----but they are discontinued- and not recommended because of the combustion issues--this total answer is still out there from my area-i'll bet there still some out there---but they are not recommended here in colorado--and here every city villiage town is under a different code year------we don't always find wh in pits--but relief valved to sump pits-----again it was just a fyi post---but as you can see sometimes fyis lead to english grammar corrections and get out of hand----sorry i didn't answer your question,appropriately-----soup is good for you
charlie