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All installations and services must be performed by qualified service personnel.
iv
: The CHB1/CDB1 furnace models are sealed combustion design, which does not require an air
shutter adjustment (air shutters are not used) for proper flame characteristics. Burner box access cover must
always be secured with all screws in place and tightened before operating furnace.
: Personal injury or property damage could result from repair or service of this furnace by anyone
other than a qualified heating contractor. Only the homeowner/user routine maintenance described in the Users
Information Manual may be performed by the user.