Ventilation and Combustion Air Requirements
A Category IV appliance utilizes uncontaminated indoor or outdoor air
surrounding the appliance for combustion. In the case of Indirect vent
installation, the space must be provided with ventilation / combustion
air openings properly sized for all make-up air requirements (exhaust
fans, clothes dryers, fireplaces, etc.) and the total input of all applianc-
es, including the INSTINCT when located in the same space. Failure to
provide or properly size the openings can result in substantial property
damage, serious injury, or death.
For installations in which the INSTINCT shares the space with air
movers (exhaust fan, clothes dryers, fireplaces, etc.) and other
combustion equipment (gas or oil) the space must be provided with
adequate air openings to provide ventilation and combustion air to the
equipment. To properly size the ventilation / combustion air openings,
the installer must comply with the National Fuel Gas Code (NFPA 54 /
ANSI Z223.1) for installations in the U.S. or CAN/ CSA B149.1 for
installations in Canada.
In the case of In-direct vent installation the air openings provided by the
installer to supply ventilation and combustion air are essential for safe
operation of the appliance. The user must respect the importance of
these air openings and ensure that they are not partially or fully
blocked under any condition. Failure to ensure free uncontaminated air
flow through the openings can result in substantial property damage,
serious injury, or death.
WARNING
UIN 223093 A01
Fig. 14 - Ventilation and Combustion Requirements Sticker Placed on the Appliance
23
CHAPTER 3
CHAPTER 3 - CATEGORY IV (INDOOR AIR) INSTALLATION OF VENT/AIR PIPING
The INSTINCT boiler is classied as a Category IV appli-
ance. A Category IV appliance utilizes uncontaminat-
ed indoor or outdoor air (surrounding the appliance)
for combustion. A sticker, shown in Fig. 14 below, is
placed on the boiler to identify the appliance classi-
cation and the applicable ventilation and combustion
air requirements.
A direct vent installation uses the outdoor air. Air sup-
ply, combustion chamber, heat exchanger and evacu-
ation of POC (products of combustion) for this type of
appliance is sealed with respect to the room in which
the appliance is installed.
An indirect installation uses uncontaminated indoor air
for appliance combustion.
In the case of Indirect vent installation, the
space must be provided with ventilation /
combustion air openings properly sized for
all make-up air requirements (exhaust fans,
clothes dryers, fireplaces, etc.) and the to-
tal input of all appliances, including the IN-
STINCT when located in the same space. Fail-
ure to provide or properly size the openings
can result in substantial property damage,
serious injury, or death.
WARNING
For installations in which the INSTINCT shares the space
with air movers (exhaust fan, clothes dryers, replaces, etc.)
and other combustion equipment (gas or oil) the space
must be provided with adequate air openings to provide
ventilation and combustion air to the equipment.
• When the air for combustion is taken from
the room air grilles must be installed by the
contractor. The air grilles should be sized in
accordance with ANSI Z223.1/ NFPA54 and/
or Natural Gas and Propane Installation
Code CAN/CSA B149.1.
• The grille providing air when taking air di-
rectly from the room should be identified
to the consumer and the importance of
ensuring that the grilles are not restricted
or blocked in any way clearly explained to
the consumer. The grilles should be clear-
ly labeled “AIR SUPPLY, DO NOT COVER OR
RESTRICT. FAILURE TO PROVIDE ADEQUATE
AIR FOR COMBUSTION COULD RESULT IN
SERIOUS INJURY, OR DEATH.”
WARNING
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