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Part number 550-110-266/0601
Hazard definitions
The following defined terms are used throughout these Instructions to bring attention to the
presence of hazards of various risk levels or to important information concerning the life of
the product.
Indicates presence of hazards that will cause severe personal injury, death
or substantial property damage.
Indicates presence of hazards that can cause severe personal injury, death
or substantial property damage.
Indicates presence of hazards that will or can cause minor personal injury
or property damage.
Indicates special instructions on installation, operation or maintenance that
are important but not related to personal injury or property damage.
To the installer:
This Venting Supplement must only be used by a qualified installer/service
technician. Read these Instructions completely before beginning the
installation. Failure to follow all instructions can cause severe personal injury,
death or substantial property damage.
To install a new vent system follow instructions in:
• This Venting Supplement.
• GV Boilers Vent/Air Intake Termination Assembly Instructions, if
using Weil-McLain Vent/Air Intake Termination Kit. — OR —
• GV Water Boiler Series 3 & 4 Direct Vent Through-Roof or Through-
Unused-Chimney Venting Supplement, if using Weil-McLain
Through-Roof or Through-Unused-Chimney Termination Kit.
• Z-Vent II manufacturer’s instructions supplied with vent material.
For installations above 5,500 feet use only direct vent (ducted combustion
air) when sidewall venting. All of the vertical (through-roof or through-
unused-chimney) methods in this Venting Supplement are acceptable and
can result in severe personal injury, death or substantial property damage
if ignored.
Z-Vent II
Venting Supplement
Special gas vent system vent and combustion air supplement
Z-Flex
®
, Inc. Z-Vent II AL29-4C
®
Stainless Steel Special Gas Vent System may be used in new
installations of GV-3 through GV-6 boilers.
Water Boiler — Series 3 & 4