Slant/Fin Prodigy 21 KC-50 Installation And Operating Instructions Manual page 8

DIRECT VENTING WITHOUT VENT TERMINAL
Vertical venting configurations
All Prodigy 21 boiler models are certified for vertical
direct venting utilizing the following configurations.
1. Vent and air intake piping vertically run up through
a roof in close proximity.
a. For a pitched roof installation, refer to Figure 10.
For a flat roof installation, refer to Figure 11.
When floor and ceiling passage is necessary,
refer to Figure 9. Adhere to all clearances and
materials specified in these illustrations.
b. The stainless exhaust vent pipe must pass
through the roof vertically through a 178 mm (7")
min. diameter cutout and appropriate roof flash-
ing. The pipe must exhaust straight up and termi-
nate with a screen terminator.
c. The air intake pipe must pass through the roof
vertically. The cutout does not require any clear-
ance, but must be sealed with a flashing or other
means. The air intake opening must face down
by using a 180° elbow with a screen positioned
at the opening. The air intake opening must be at
least 305 mm (1 foot) below the vent opening.
Figure 9. Floor and ceiling venting passage
All items shown below are REQUIRED. All vent
joints must be LIQUID and PRESSURE TIGHT.
8
Figure 10. Vent and air intake run through a pitched roof
Figure 11. Vent and air intake run through a flat roof