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APPENDIX B1 – ATMOSPHERIC VENTING
Figure B-1: Typical Atmospheric Vent Installation
GENERAL WARNINGS FOR ATMOSPHERIC VENTING SYSTEMS
USE ATMOSPHERIC VENTING only with
boilers approved for atmospheric venting as
noted in the Specifications Section of this
manual.
INSPECT EXISTING CHIMNEY for obstructions
and deterioration and repair or line the chimney
prior to placing the boiler in service.
UNLINED MASONRY CONSTRUCTION is
prohibited for use as a chimney.
FIREPLACES AND FAN-ASSISTED GAS
APPLIANCES must not be vented into the same
chimney space as this boiler.
DO NOT REDUCE THE DIAMETER of the vent
connector between the boiler and the chimney.
It must not be smaller than the outlet on the
drafthood, damper, or vent reducer supplied with
the boiler.
UNLISTED VENT DAMPERS AND
OBSTRUCTIONS in the vent pipe are prohibited.
THE VENT DAMPER supplied with the boiler
shall not be used to block the vent of any other
appliance.
Install vent and vent connector (Figure B-1). Comply with all design and installation requirements in the
Connect Venting Section of this manual, local code, and the National Fuel Gas Code or Can/CSA B149.1.
Clay ue lined masonry chimneys do not meet the venting requirements for this appliance.