NEGATIVE AIR – MAKEUP AIR
Continued:
3) Determine if the space is “confined” or “unconfined”. Do this by dividing the total volume of the room
(cu. Ft.) by the total input requirements of the room (BTUs per hour)
cu. ft. ÷ BTUs/hr
a: If the result is
greater than or equal to
50 cu.ft. / 1000BTU per hour, then the space is
considered to be “
Unconfined
.”
b: If the result is
less than
50 cu.ft. / BTU per hour, then the space is to be considered
“
Confined
”
4) For an “unconfined” space in a conventionally constructed building, the fresh air filtration through
gaps in doors and windows would
NORMALLY
provide adequate air for combustion and ventilation. No
additional make-up air should be required.
5) For a “confined” space or an “unconfined” space in a building with unusually tight construction, an
additional source of make-up air is required. In this case please consult an HVAC professional to deter-
mine the best way to supply make-up air requirements for your furnace installation.
Note:
If the furnace and wood storage area are in the same or adjacent rooms and fans are to used in
these areas, ensure the fans do not create a negative air pressure that will affect the furnace operation.
WinterGreen recommends that you contact a qualified HVAC specialist to determine the air
requirements for your home.
DO NOT OPERATE THE WINTERGREEN FURNACE IN A CONFINED
AREA WITHOUT PROPER VENTILATION.
