BOILER BOOK CFC-E STACK/BREECHING SIZE CRITERIA
46
Vertical Venting Direct Vent Combustion
See Figure 35.
Figure 35. Vertical Stack with Direct Vent Combustion Air
As noted in Paragraph B above, these installations use air from outside the building for combustion.
The same recommendations apply as noted in B and also, the recommendations on flue vent sizing.
WITH
PARAPET
WALL