Munchkin HIGH EFFICIENCY HEATER with the "925" Controller Operating Instructions Manual page 21

**IMPORTANT NOTE: All vent pipes must be glued,
properly supported, and the exhaust must be pitched
a minimum of a ¼" per foot back to the heater (to
allow drainage of condensate).
Figure 4-5
DIAGRAMS FOR VERTICAL VENTING
**IMPORTANT NOTE: All vent pipes must be glued,
properly supported, and the exhaust must be pitched
a minimum of a ¼" per foot back to the heater (to
allow drainage of condensate).
Figure 4-6
VENTING
21