Sterling QVSB - Manual (Page 2)

Fasten length of 5 inch pipe to exhaust connection of concentric adapter with sheet metal
screws. Use at least three corrosion resistant screws per joint. Seal all joints with high temperature sili-
cone sealant. Concentric adapter box may be fastened directly to wall or spaced away from wall using
suitable brackets (fi eld supplied). Before mounting box, cut length of 8 inch pipe so that it will protrude
2 inches through wall when box is mounted in position. Fasten 8 inch pipe to combustion air inlet
connection of concentric adapter and seal joint. Add additional 5 inch pipe if necessary so that
base of exhaust cap will be 16 to 24 inches from combustion air inlet. See fi gures 2, step 2.
Insert pipes through wall and fasten adapter box in place. Flash and/or caulk 8 inch pipe on
outside wall. See fi gure 2 step 3.
Install inlet air screen on 8 inch pipe and fasten with sheet metal screws. Install fl ue terminal on
5 inch pipe and fasten in place. See fi gure 2, step 4.
Connect fl ue pipe and combustion air pipe from concentric adapter to unit. Pipe must be single
wall 26 gauge or heavier galvanized steel or a material of equivalent durability and corrosion
resistance. Pipe diameter must be listed under “INLET & FLUE SIZE” in Table 1 on page 4 of
Installation Instructions BSCII or PSCII or SCDFM. The equivalent length of the exhaust vent pipe
must be a minimum of 5 feet and a maximum of 50 feet. For propeller units, the equivalent length
equals the total length of straight pipe plus 10 feet for each 90 degree elbow and 5 feet for each
45 degree elbow. For duct furnaces and blower units, the equivalent length equals the total length
of straight pipe plus 15 feet for each 90 degree elbow and 5 feet for each 45 degree elbow. Secure
each joint with a minimum of 3 corrosion resistant screws. Seal all joints of the exhaust vent pipe with
two full turns of 3M #425 Aluminum Foil Tape or its equivalent suitable for 550 degrees F. or high
temperature silicone sealant. Seal all joints of the combustion air inlet pipe with two full turns of
duct tape or aluminum foil tape or silicone sealant.
Figure 1. Horizontal Concentric Venting
2