Combination Of Indoor And Outdoor Combustion Air; Combustion Air And Vent Piping; Fig. 3 - All Combustion Air From Outdoors Through Ventilated Attic; Fig. 4 - All Combustion Air From Outdoors Through Horizontal Ducts - IDEAL EXALT Solo 110 Installation & Maintenance Manual

CHAPTER 2 - COMBUSTION AIR & VENTING
• Two Permanent Opening Method. Two permanent
openings, one commencing within 12 in. of the top
and one commencing within 12 in. of the bottom
of the enclosure, shall be provided. The openings
shall communicate directly, or by ducts, with the
outdoors or spaces that freely communicate with
the outdoors, as follows:
• Where directly communicating with the
outdoors or where communication to the
outdoors is through vertical
opening shall have a minimum free area of 1
sq. in./4000 Btu/hr of total input rating of all
equipment in the enclosure. See Fig. 3 below.
Gas Vent
186°F DHW
156°F
Target = 186°F
DHW Demand
Fig. 3 - All Combustion Air from Outdoors Through
Ventilated Attic
Gas Vent
186°F
156°F DHW
Target = 186°F DHW Demand
Fig. 4 - All Combustion Air from Outdoors Through
Horizontal Ducts
8
ducts, each
Ventilation louvers
(each end of the attic)
Outlet air
Inlet air duct
(ends 1ft (30 cm)
above floor)
Outlet air duct
Inlet air duct
• Where communicating with the outdoors is
through horizontal ducts, each opening shall have
a minimum free area of not less than 1 sq.in./2000
Btu/hr of total input rating of all equipment in the
enclosure. See Fig. 4 below.
2.4.3 Combination of Indoor and Outdoor
Combustion Air
Indoor Openings. Where used, openings connecting the
interior spaces shall comply with Section 2.4.1 on page 7.
Outdoor Opening(s) Location. Outdoor opening(s) shall
be located in accordance with Section 2.4.2 on page 7.
Outdoor Opening(s) Size. Outdoor opening(s) shall be
calculated in accordance with the following:
• The ratio of the interior spaces shall be the available
volume of all communicating spaces divided by
the required volume.
• The outdoor size reduction factor shall be 1 minus
the ratio of interior spaces.
• The minimum size of outdoor opening(s) calculated
in accordance with the above outdoor air chapter
multiplied by the reduction factor. The minimum
dimension of air openings shall not be less than 3
in.
2.5.

Combustion Air and Vent Piping

The EXALT requires a Category IV venting system, which
is designed for pressurized venting and condensate.
The EXALT is certified as a Category IV or Direct
Vent (sealed combustion) appliance. A Category IV
appliance utilizes uncontaminated indoor or outdoor air
surrounding the appliance for combustion. A Direct Vent
appliance utilizes uncontaminated outdoor air piped
directly to the appliance for combustion.
DANGER
Do not install the EXALT into a common vent with
any other gas or oil appliances. This will cause flue
gas spillage or appliance malfunction, which will
result in substantial property damage, serious
injury, or death.
DANGER
It is essential that the supply of air for combustion
is not blocked or restricted - this could result in
serious injury, or death.