Dave..can you elaborate on the relationship between static air in the base and the current fan?
-isn't the stock fan rated at 60 cfm also? Is the new fan the same brand?
-with the old fan, what would u expect your home temps to be?
-are you seeing an increase in coal usage? And/or are u able to burn more coal?
-Are you burning rice or buck?...fyi...no buck anywhere in New England that I know of.
Static pressure under the grate. This was scientifically measured by removing one of the fan mounting bolts and inserting the air meter. Before with old 60cfm fan wide open I was seeing .04 draft above the boiler. and .04 in the base. Flames were barely 1 foot high. With the new 65cfm fan wide open I went positive pressure in the base there is a plate for the inlet to block off air. Adjusted the inlet to .02- .03 in the base. Nice high flames right up around the diffuser. Flue temp stayed the same right around 208* at full burn with IR gun. Boiler temp went right up to 180*
The surprising thing was I was expecting to use more coal since I turned my Max feed screw 1/2 turn . Actually I burned about the same or less to maintain my home to the same temp of 72* I was burning between 110-120# / day since the cold moved in. I am still burning the same amount of coal approximately too lazy to get that detailed.
So Friday night set my 3 zones to 80* within 2hrs I was there. Again I didn't actually make it too calculated. I have a 5yr old to entertain. But id did get there . The Boiler cycled on and off as expected during the heating process. I am set at 165 and 185 w 10* diff.
I burn rice.