ECR International PENNCO FSB 3 Series Installation, Operation & Maintenance Manual page 15

Figure 7 - Type B Gas Vent
!
WARNING
3" x 4" increaser is required for Category I venting.
Failure to follow these instructions could result in
asphyxiation from poisonous gases such as carbon
monoxide which is odorless and invisible and may
result in serious injury or death.
CHECK YOUR CHIMNEY
For boilers connection to gas vents or chimneys,
vent installations shall be in accordance with
"Venting of Equipment", of the National Fuel
Gas Code, ANSI Z223.1/NFPA 54, or applicable
provisions of the local building codes.
7 - VENT INSTALLATION
Liner
Chimney
Thimble
Vent System
Cleanout
Boiler
3"x4" Increaser
15
Vent pipe must be:
At lease 2 ft.
(610mm) higher
than any part of
the roof, but not
less than 3 ft.
(915mm) tall, and
within a 10 ft. within a 10 ft.
(3m) radius of the
apex.
PN 240013101 Rev. A [08/15/2020]