Flue gas exhaust: condensate, and potentially rain water, flow back from the venting
system.
Air intake piping: Warning - Risk of damage to appliance. Ensure that rain water is
prevented from entering.
Condensate water line: Warning - Risk of damage to appliance. All condensate discharge
lines, including neutralization tank inlet, must be at a lower elevation than the condensate
water line of the appliance.
Free flow of condensate from venting systems and the pressure vessel must be maintained
at all times. Trap and condensate drain piping must be accessible to allow regular
inspection and cleaning.