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Installation & Operation Manual
13
2 Venting
BEFORE YOU BEGIN
Identify your appliance’s vent system:
This manual covers venting requirements for CAT II/IV and CAT I models. Be sure to correctly identify the type of vent system
your appliance requires before proceeding.
Category II/IV Models: See page 15
Water PFN0502PM-M9
Heaters PFN0752PM-M9
PFN1002PM-M9
PFN1302PM-M9
PFN1501PM-M9
PFN1701PM-M9
PFN2001PM-M9
Boilers PBN0502-M9
PBN0752-M9
PBN1002-M9
PBN1302-M9
PBN1501-M9
PBN1701-M9
PBN2001-M9
A
D
B C
E F
CAT II requires vent
increaser kit.
Venting options:
Category I Models: See page 19
Water PFN0502PM-F9
Heaters PFN0752PM-F9
PFN1002PM-F9
PFN1302PM-F9
PFN1501PM-B9(*)
PFN1701PM-B9(*)
PFN2001PM-B9(*)
Boilers PBN0502-F9
PBN0752-F9
PBN1002-F9
PBN1302-F9
PBN1501-B9(*)
PBN1701-B9(*)
PBN2001-B9(*)
G H I
Venting options:
ƽ DANGER
Failure to use correct venting materials can result in loss of life from flue gas spillage into working or
living space.
Venting Category Definitions: (Reference National Fuel Gas Code ANSI Z223.1)
CAT IV: Positive pressure condensing
An appliance that operates with a positive vent static pressure with a vent gas temperature that may cause excessive condensate
production in the vent.
CAT II: Negative pressure condensing
An appliance that operates with a non-positive vent static pressure with a vent gas temperature that may cause excessive
condensate production in the vent.
CAT I: Negative pressure non-condensing
An appliance that operates with a non-positive vent static pressure with a vent gas temperature that avoids excessive condensate
production in the vent.
*CAT I “B9” models require field supplied barometric dampers.
NOTICE
Category II venting is required when common
venting multiple M9 models .