Munchkin HIGH EFFICIENCY HEATER with the "925" Controller - Manual (Page 21)

VENTING
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
**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
DIAGRAMS FOR VERTICAL VENTING