FMI VSGF36NRC ユーザーズマニュアル

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9

This fresh air would come from an adjoining 

unconfined  space.  When  ventilating  to  an 

adjoining unconfined space, you must provide 

two permanent openings: one within 12" of 

ceiling  and  one  within  12"  of  floor  on  wall 

connecting two spaces (see options 1 and 

2, Figure 4). You can also remove door into 

adjoining room (see option 3, Figure 3). Follow 

the National Fuel Gas Code, ANSI Z223.1/

NFPA 54, Air for Combustion and Ventilation 

for required size of ventilation grills or ducts. 

Provide extra fresh air by using ventilation 

grills or ducts. You must provide two perma-

nent 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. Follow the National Fuel 

Combustion and Ventilation for required size 

of ventilation grills or ducts.
IMPORTANT: Do not provide openings for 

inlet or outlet air into attic if attic has a thermo-

stat-controlled power vent. Heated air entering 

the attic will activate the power vent.

Or

Remove

Door into
Adjoining

Room,
Option

3

Ventilation Grills 

Into Adjoining Room,

Option 2

Ventilation

Grills 

Into

Adjoining 

Room,

Option 1

12"

12"

Outlet

Air

Ventilated

Attic 

Outlet

Air

Inlet

Air

Inlet Air

Ventilated 

Crawl Space

To 

Crawl

Space

To Attic