12
Vent Location
The vent terminal must be located through the roof. This gravity
vent appliance is designed to operate when an undisturbed
airflow hits the outside vent terminal from any direction.
Check local codes for allowable vertical vent termination.
Vent Materials
Use a 3” diameter aluminum flex liner approved for gas venting
when installed as an insert (existing chimney). Use a 4” diameter
type “B” vent when installed with a 770ZCK Zero Clearance Kit
(see separate instructions packaged with the kit for details).
Venting Notes
Where possible, avoid joining flex pipes. If joints are required, use
a approved connector and seal joints with RTV high temp sealant.
Horizontal offsets are permissible to allow for routing around
masonry projections. Avoid bending flex pipe over a 45 degrees
radius where possible.
Terminal Cap
Flashing
3” fl ex liner
Venting
Concept
Typical Vent Installation
Approved Termination Required
Max. 36” offset at 10’-0” min. vertical
3” Liner
3” min. Bend
Radius
Min. 10 feet (with offset)
Min. 8 feet (without offset)
Minimum Vent Liner Radius
Allowable Vent Configurations
Minimum vent lengths.
For other allowable configurations,
refer to the venting tables in the
National Fuel Gas Code Z223.1 or the
Natural Gas or Propane Installation
Code B149.1.
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