Approved Termination Required
Max. 36” offset at 10’-0” min. vertical
3” Liner
3” min. Bend
Radius
M
in.
10 f
eet (with off
set)
M
in.
8 f
eet (without off
set)
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.
Terminal Cap
Flashing
1 x 3”
fl
ex liner
Vent Location
The vent terminal must be located through the roof. This gravity
vent appliance is designed to opreate when an undistrubed
air
fl
ow hits the outside vent terminal from any direction.
Check local codes for allowable vertical vent termination.
Vent Materials
Use a 3” diameter aluminum
fl
ex 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
fl
ex pipe. 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
fl
ex pipe over a 45 degrees
radius where possible.
Typical Vent Installation
17
Venting
QUALIFIED
INSTALLER
