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2
Venting
Identify your appliance's vent system:
This manual covers venting requirements for CAT I models and CAT IV vent materials. Be sure to correctly identify the type of
vent system your appliance requires before proceeding.
GWH0400(N,P)
GWH0500(N,P)
GWH0650(N,P)
GWH0750(N,P)
GWH1000(N,P)
GWH1250(N,P)
GWH1450(N,P)
GWH1800(N,P)
GWH2100(N,P)
Failure to use correct venting materials can result in loss of life from flue gas spillage into working or living
DANGER
space.
Venting Category Definitions:
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 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 IV Flue pipe materials
The following manufacturers supply flue materials suitable for these models when installed as CAT IV. All materials are made with
AL29-4C stainless steel.
Heat-Fab Inc., Saf-T CI Vent with AL29-4C stainless steel
Protech Systems Inc., Fas N Seal Vent with AL29-4C stainless steel
Metal-Fab Inc., Corr/Guard Vent with AL29-4C stainless steel
Or other listed Category IV vent systems suitable for a condensing, positive pressure, gas fired appliance.
A Category IV flue MUST have all vent joints and seams sealed gastight and have provisions for a drain to properly collect and
dispose of condensate that may occur in the venting system.
14
BEFORE YOU BEGIN
Venting options:
A B C
E
F
= Outdoor Vent Option
(Reference National Fuel Gas Code ANSI Z223.1)
Installation & Operation Manual
D
= Direct Vent Options
CAT IV
= B-Vent Material
CAT I
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