Furnace Min Chimney Height

[04HemiRam2500]

I know that many of the epa stove require a certain height of chimney to get a good draft.

I am still looking at the englander 28-3500 furnace. I noticed that the manual doe snot specify a min chimney height. It states that the chimney must not exceed 0.05 in columns?

Why is there a difference between the non epa furnace and the epa stoves and what min chimney height is needed for the furnace?

 

[BoilerMan]

I think it has to do with there being enough draught to pull enough air in the secondary tubes for complete combustion.

TS