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 - TriangleTube PRESTIGE Excellence 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 out-
doors or where communication to the outdoors
is through vertical ducts, each 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.
Fig. 3 - All Combustion Air from Outdoors Through
Ventilated Attic
Fig. 4 - All Combustion Air from Outdoors Through
Horizontal Ducts
6
• 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 in-
terior spaces shall comply with Section 2.4.1 on page 5.
Outdoor Opening(s) Location. Outdoor opening(s) shall
be located in accordance with Section 2.4.2 on page 5.
Outdoor Opening(s) Size. Outdoor opening(s) shall be
calculated in accordance with the following:
• The ratio of the interior spaces shall be the avail-
able 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) calculat-
ed in accordance with the above outdoor air chap-
ter multiplied by the reduction factor. The mini-
mum dimension of air openings shall not be less
than 3 in.
2.5.

Combustion Air and Vent Piping

The PRESTIGE Excellence requires a Category IV venting
system, which is designed for pressurized venting and
condensate.
The PRESTIGE Excellence 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 di-
rectly to the appliance for combustion.
DANGER
Do not install the PRESTIGE Excellence into
a common vent with any other gas or oil ap-
pliances. This will cause flue gas spillage or
appliance malfunction, which will result in
substantial property damage, serious injury,
or death.