5. Drill drain hole:
a. Mark location on bottom side of pipe that will be outside between end of pipe and building—about 2/3 of
distance from end of pipe to edge of building—when concentric adapter box is installed.
b. Drill 1/2-inch diameter drain hole at location marked in step 5a.
6. Install air inlet ring guard:
a. Position inlet air ring guard over end of combustion air pipe in accordance with Figure 16.
b. Secure inlet air ring guard to inlet air pipe using four 1/2-inch-long screws provided.
7. Secure concentric adapter box to the wall:
a. Insert combustion air pipe with inlet guard attached out through wall.
b. Position concentric adapter box so that pipe is centered in opening and secure box brackets to wall using
field-supplied hardware.
8. Install terminal-end vent pipe:
NOTE: The length of the continuous piece of terminal-end vent pipe is determined by the instal-
lation within maximum and minimum requirements. The vent pipe extending through the box and
through the combustion air inlet pipe must be one piece without joints.
a. Refer to Figure 16 to determine lengths of each pipe segment and to calculate total length required.
b. Ensure that terminal-end vent pipe is in proper flow direction and temporarily fit elbow pointing down on exhaust
end of vent pipe.
NOTE: For easier future service, the elbow is secured to the vent pipe using one field-provided
3/4-inch-long sheet metal screw.
c. Drill hole through top center of elbow socket and vent pipe using drill bit one size smaller than 3/4-inch-long
sheet metal screw. Remove elbow and enlarge drilled hole in elbow to 7/32 inch.
d. Turn vent pipe so that drilled hole is at top and slide end of pipe out through concentric adapter box and
combustion air pipe.
e. Position vent pipe so that it extends 3–6 inches (76–152 mm) past end of combustion air pipe. Turn pipe so
that screw hole is in top center.
f. Ensure that silicone sealing ring on concentric adapter box is properly seated. Do not add sealant to ring.
g. Connect terminal-end vent pipe to vent pipe run and recheck sealing ring to ensure that it is still properly seated.
9. Install indoor section of combustion air pipe:
a. Secure single-wall combustion air pipe run to collar on concentric adapter box using sheet metal screws.
b. Seal pipe joint using tape or sealant.
10. Install inlet air guard spacers, elbow, and bird screen on outdoor section of combustion air pipe:
a. Remove inlet air ring guard screws installed in step 6b. Slide spacers onto ends of four spokes that support
vent pipe. Re-install guard and secure using screws.
b. Slide elbow pointing down on end of pipe, align hole drilled in step 8c, and secure elbow using field-supplied
3/4-inch-long sheet metal screw.
c. Insert bird screen into socket on open end of elbow.
11. Seal or flash around combustion air pipe:
a. Seal around combustion air pipe using an outdoor caulking material, masonry cement, or combination of
flashing and caulking.
b. Adjust sealant and pipe so that pipe has slight downward slope to outside. Downward slope and drain hole
drilled in step 5b prevents rain water from running through pipe into concentric adapter box.
12. Verify compliance with Figure 16 and with all specifications listed in Venting and Combustion Air
Requirements and Hazards of Chlorine sections.
27
I-UEZ (04-21) 1034347-0
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