Unvented (vent-free) logmate, Firebox, Air for combustion and ventilation – Desa FBPS User Manual

Page 6: Continued

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6

105163

UNVENTED (VENT-FREE) LOGMATE

®

FIREBOX

®

AIR FOR
COMBUSTION AND
VENTILATION

Continued

VENTILATION AIR

Ventilation Air From Inside
Building

This fresh air would come from an adjoining
unconfined space. When ventilating to an
adjoining unconfined space, you must pro-
vide two permanent openings: one within
12" of the ceiling and one within 12" of the
floor on the wall connecting the two spaces
(see option 1, Figure 3). You can also re-
move door into adjoining room (see option
2, Figure 3). Follow the National Fuel Gas
Code NFPA 54/ANS Z223.1, Section 5.3,
Air for Combustion and Ventilation
for re-
quired size of ventilation grills or ducts.

Figure 4 - Ventilation Air from Outdoors

Ventilation Air From Outdoors

Provide extra fresh air by using ventilation
grills or ducts. You must provide two per-
manent openings: one within 12" of the
ceiling and one within 12" of the floor.
Connect these items directly to the outdoors
or spaces open to the outdoors. These spaces
include attics and crawl spaces.

IMPORTANT:

Do not provide openings for

inlet or outlet air into attic if attic has a
thermostat-controlled power vent. Heated air
entering the attic will activate the power vent.

Figure 3 - Ventilation Air from Inside Building

Or

Remove

Door into
Adjoining

Room,
Option

2

Ventilation

Grills

Into Adjoining

Room,

Option 1

4"

Outlet
Air

Ventilated
Attic

Outlet
Air

Inlet
Air

Inlet Air

Ventilated

Crawl Space

To

Crawl

Space

To Attic

WARNING: Rework work-

sheet, adding the space of the
adjoining unconfined space. The
combined spaces must have
enough fresh air to supply all
appliances in both spaces.

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