Temco PVF7400 Series Installation And Operating Instructions Manual page 6

Temco PVF7400 Series
Ventilation Air from Outdoors for Unusually
Tight Construction
WARNING: If the area in which the heater may be
operated is smaller than that defined as an uncon-
fined space or if the building is of unusually tight
construction, provide adequate combustion and
ventilation air by one of the methods described in
the National Fuel Gas Code, ANSI Z223.1/NFPA 54,
Section 5.3 or applicable local codes.
Unusually tight construction is defined as construc-
tion where:
a. walls and ceilings exposed to the outside atmo-
sphere have a continuous water vapor retarder with
a rating of one perm (6x10.
less with openings gasketed or sealed and
b. weather stripping has been added on openable
windows and doors.
c. caulking or sealants are applied to areas such as
joints around window and door frames, between sole
plates and floors, between wall-ceiling joints, be-
tween wall panels, at penetrations for plumbing,
electrical and gas lines and at other openings.
If your home meets all of the three criteria above, you
must provide additional fresh air.
Fig. 2 Ventilation options for confined spaces.
6
-11 kg per pa-sec-m 2 ) or
OPTION 1 -
Vents to
Adjoining
Room
You may provide two permanent openings: one within
12" of the ceiling and one within 12" of the floor. Con-
nect these items directly to the outdoors or spaces
open to the outdoors. These spaces include attics and
crawl spaces. Follow the National Fuel Gas Code
NFPA 54/ANSI 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 or
outlet air into attic if attic has a thermostat-controlled
power vent. Heated air entering the attic will activate
the power vent.
You may provide two permanent openings: one within
12" of the ceiling and one within 12" of the floor. Con-
nect these items directly to the outdoors or spaces
open to the outdoors. These spaces include attics and
crawl spaces. Follow the National Fuel Gas Code
NFPA 54/ANSI Z223.1, Section 5.3, Air for Combustion
and Ventilation for required size of ventilation grills or
ducts.
WARNING: Air openings that provide fresh air
from an adjoining unconfined space shall not be
blocked or obstructed in any way. Installation of
unit should allow a minimum of 2" clearance
from any part of the heater to any of the ventila-
tion openings.
OPTION 3 -
Vents to
Adjoining
Room
OPTION 2 -
Remove
Door to
Adjoining
Room
12"
12"
VO370-2
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