Venting; Vent Categories - Lochinvar Power-Fin Designer's Manual

Designer's Guide / Power-fin Water Heater
Chapter 2 – Venting
Venting is a difficult design element for the installation of a gas fired appliance. It has a variety of
choices, it has several available vent configurations, it has the important rules and regulations
that govern the installation and most important of all, it bears a requirement for human safety.
Warning
SPILLAGE OF FLUE PRODUCTS AND CARBON MONOXIDE EMISSIONS PRODUCED BY THE
COMBUSTION PROCESS CAN CAUSE SEVERE PERSONAL INJURY OR DEATH.
Lochinvar offers twelve different vent configurations on the Power-fin water heater to meet the
building's requirements. There are six layouts or footprints across three different vent categories.
They are...
Vertical Vent with Air from the Equipment Room
Vertical Vent with Air from the Rooftop
Vertical Vent with Air from the Sidewall
Sidewall Vent with Air from the Equipment Room
Sidewall Vent with Air from the Rooftop
Sidewall Vent with Air from the Sidewall
That's a lot of choices. Plus there is an important
new consideration about specifying the correct
Firing Code. Allow me to overexplain.
Part 1

Vent Categories

Here is the traditional vent category diagram, standard throughout the industry. Lochinvar offers
twelve venting options that allow the Power-fin to be installed in any of three categories -
Category I, Category II and Category IV. Depending upon the "Firing Code" chosen, the Power-
fin water heater will be factory trimmed for direct connection either Category I or Category IV
venting. Part 2 explains "Firing Codes" and their relationship to Category I and Category IV.
We'll explain Category II later.
CATEGORY I
Non-Condensing
Non-Positive Pressure
CATEGORY II
Condensing
Non-Positive Pressure
Category I, Category II or Category IV
Category I, Category II or Category IV
Category I, Category II or Category IV
Category IV only
Category IV only
Category IV only

Venting

CATEGORY III
Non-Condensing
Positive Pressure
CATEGORY IV
Condensing
Positive Pressure
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LOCHINVAR CORPORATION
300 MADDOX SIMPSON PKWY
LEBANON, TN 37090
www.lochinvar.com