the gas code!!! A 90% 1 pipe flue should be well away from any openings
in the structure where fumes could be sucked in. Hmmm, these 2 exhausts
are blowing right at the combustion air inlet to the equipment room.
Guess no one in that building has ever read the venting instructions
from NFPA54. NFPA is National Fire Prevention Association. The building?
A FIRE STATION!