Burnham Hydronics MMII Installation & Service Instructions Manual page 16

d. Minimum 4 feet (6 feet in Canada) horizontally
from electric meters, gas meters, regulators, and
relief equipment.
e. Minimum 12 inches from overhang or corner.
3. Use double wall thimble when passing through
combustible outside wall (thimble use optional for
noncombustible wall). Insert thimble through wall
from outside. Secure outside fl ange to wall with
nails or screws, and seal OD, ID and vent holes with
sealant material. Install inside fl ange to inside wall,
secure with nails or screws, and seal with sealant
material.
4. For noncombustible wall when thimble is not used,
size opening such that female (bell) end with
locking band attached cannot pass through.
5. Join vent terminal to vent pipe. Locate vent terminal
between 3" and 6" from wall when joined to inside
vent piping. See Figure 13.
Figure 13: Horizontal Vent Pipe Wall Penetration
Figure 14: Horizontal Air Intake Pipe Wall
Penetration
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6. Insert vent pipe through thimble/opening from
outside and join to vent system. Apply sealant
between vent pipe and opening/thimble to provide
weathertight seal.
Figure 15: Vent/Air Intake Terminal Relationship
Horizontal (thru wall) or Vertical (thru roof)
I.
Vertical (Through Roof) Vent Installation
1. Install vertical vent drain tee (see Table 7 for part
number). See Figure 16. Attach tee directly to
elbow or horizontal pipe from elbow.
2. Install condensate drain line. Use 3/8 inch i.d. high
temperature fl exible tubing such as silicone rubber
or EPDM. See Figure below.
a. Form condensate trap with 6 inch diameter loop.
Secure loop with plastic cable tie. Fill with
water.