Desa VMH10TPA installation manual Ventilation AIR, Ventilation Air From Inside Building

OWNER’S MANUAL

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 options 1 and 2, Figure 4). You can also remove door into adjoining room (see op- tion 3, Figure 4). Follow the National Fuel

Ventilation
Grills	Or
into Adjoining	Remove
Room,	Door into
Option 1	Adjoining
	Room,
	Option 3

12"

Ventilation Grills

Into Adjoining Room,

Option 2

Gas Code NFPA 54/ANS Z223.1, Section 5.3, Air for Combustion and Ventilation for required size of ventilation grills or ducts.

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.

12"

Figure 4 - Ventilation Air from Inside Building Shown with Optional Mantel

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	Outlet
ceiling and one within 12" of the floor.
Connect these items directly to the outdoors	Air
or spaces open to the outdoors. These spaces
include attics and crawl spaces. Follow the
National Fuel Gas Code NFPA 54/ANS
Z223.1, Section 5.3, Air for Combustion and
Ventilation for required size of ventilation
grills or ducts.
IMPORTANT: Do not provide openings for	Inlet
inlet or outlet air into attic if attic has a	Air
thermostat-controlled power vent. Heated air
entering the attic will activate the power vent.

Ventilated

Outlet Attic

Air

To Attic

To

Crawl

Space

Inlet Air	Ventilated
	Crawl Space

Figure 5 - Ventilation Air from Outdoors Shown with Optional Mantel

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