Gyula Kósa wrote:
I'm not sure if Peter's red heater made entirely of cast parts has or has not got any air gap: on one picture there seems to be a 10 cm gap, while on the final picture the heater looks like it is placed to the wall.
Peter van den Berg wrote:The one mistake which could be made is the depth of the port which isn't that well defined. As a rule of thumb, have the depth the same as the specified width within a 30% plus/minus tolerance.
Glenn Herbert wrote:With the constraint of not projecting farther than necessary from the (internal masonry) wall, Peter, what would you say would be the minimum thickness of the bell space? Would 8" for parts of it work, with other parts thicker at projecting under-hearth and over-firebox areas?
Gerry Parent wrote:Peter, I'm new to batch boxes and am curious to know how the depth of the port affects the venturi effect?
Peter van den Berg wrote:So in your situation Gerry, the port is about 44% shallower than its depth. The real disadvantage seems to start when this deviation is greater than 50%. In my experience, people tend to think there's a tolerance on the tolerance, so when I say 50 others think 60 is OK too. It isn't in reality, so I mention a lower tolerance to be on the safe side.