HearthStone Sterling-Ht 8532 Owner's Manual & Installation Manual page 13

Hearthstone Quality Home Heating Products, Inc STERLING-Ht Model 8532
C. Horizontal Terminations for 4"x 6" Pipe
(Requires the use of Top Exit Kit, # 95-60320)
Note: All top exit configurations require a minimum of a 24" section of pipe directly off the unit
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