Weil-McLain Evergreen EVG 220 Manual page 32

®
gas
DIRECT VENT — Vertical with separate pipes
Prepare roof penetrations
1. Air pipe penetration:
a. Cut a hole for the air pipe. Size the air pipe hole as close
as desired to the air pipe outside diameter.
2. Vent pipe penetration:
a. Cut a hole for the vent pipe. For either combustible or
noncombustible construction, size the vent pipe hole at
least 0.4" larger than the vent pipe diameter.
b. Insert a galvanized metal thimble in the vent pipe hole.
3. Space the air and vent holes no closer than the minimum
spacings shown in Figure 38, page 32.
4. Follow all local codes and vent pipe manufacturer's instruc-
tions for isolation of vent pipe when passing through floors,
ceilings and roofs.
5. Provide flashing and sealing boots sized for the vent pipe and
air pipe. Follow all vent pipe manufacturer's instructions.
Termination and fittings
1. Prepare the vent termination elbow and the air termination
elbow (Figure 37, page 31) by inserting bird screens. Bird
screens must be purchased separately. See the parts list at the
end of this manual for part numbers.
2. The air piping must terminate in a down-turned 180-degree
return bend as shown in Figure 37, page 31. The edge of the
air inlet elbow must be at least 12 inches above the roof or
snow line.
3. The vent piping must terminate in an up-turned coupling as
shown in Figure 37, page 31. The top of the coupling must
be at least 12 inches above the air intake in order to avoid the
recirculation of flue products into the combustion air stream.
4. Maintain the required dimensions of the finished termination
piping as shown in Figure 37, page 31.
5. Do not extend exposed vent pipe outside of building more
than shown in this document. Condensate could freeze and
block vent pipe.
– 32 –
-
fired water boiler
See notices on previous page.
— 220/299/300/399 Boiler Manual
Figure 38
Terminations for multiple boilers
(continued)
Part number 550-100-131/0120