You can use vertical or horizontal pipes. Several
types of ventilation can be used to determine the
type of ventilation. The various options are listed
below.
1. Directly to the outdoors
2. Vertical pipe
3. Horizontal pipeline
4. Single opening (not recommended; must be at
2
least 100 in (6.5 cm ). Not applicable to confined
spaces of less than 50 ft (1.42 m )per 1000
BTU/hour or from another The air in the room.)
5. From a larger room in the room (not
recommended - refer to "Calculate the amount
of air in the room" above to determine if the total
volume of the room is sufficient).
The minimum free zone vents required to define
each vent are sized depending on the total BTU/h
rating of all appliances in the space (using the
"before" calculation) and the type of vents used.
Table 1 provides the minimum free area for each
vent, depending on the type of ventilation.
Calculating the minimum size of the vents and
Ÿ
piping The venting cross-sectional area required
to provide a free area depends on the covering
on the vent. Typical vents use shutters or grilles
to protect the opening. The blinds or grill itself
block some free areas, so the openings may
need to be larger to meet the minimum free area
requirements. Calculate the required cross-
sectional area using the following formula:
Cross-sectional area = minimum required free
area percentage of free area covered (in
decimals - Eg, 60% = 0.6) For example, an
2
opening of 100 in (645 cm ) installation area if
use metal blinds rated at 75% free zone (100 in
2
÷ 0.75 = 134 in ), then a 134 inch 2 (865 cm )
opening is required. If you don't know the %
available area of the blinds or grill, use the
following values:
For wooden shutters or grilles: 25%
Ÿ
For metal shutters or grilles: 75% follow these
Ÿ
rules to ensure that the vents and ducts provide
adequate airflow:
Each vent must be no less than 100in (645 cm ).
Ÿ
The pipe must have the same cross-sectional
Ÿ
area as the free area of the opening.
The minimum size of a rectangular pipe must not
Ÿ
be less than 3 inches (76 mm).
2
3
3
2
All screens must have a grid of 1/4 inch or
Ÿ
larger.
The removable blinds must be locked open or
Ÿ
interconnected to automatically open during
operation.
Keep blinds and grills clean and free of debris or
Ÿ
other obstructions. Check that the air source is
clean and free of chemicals. The air used for
combustion and ventilation must be clean, free
from corrosive or flammable chemicals. Failures
caused by corrosive chemicals in the air are not
covered by the warranty. The combustion air
must be free of sulfur-containing, acid-
containing chemicals such as fluorine and
chlorine. Make sure that these chemicals are not
in the air at the vents.
3.9 Gas And Gas Pipe Specifications
WARNING
First check that the gas type matches the
Ÿ
nameplate.
Make sure that all gas regulators in use
Ÿ
are operating properly and provide gas
pressure within the specified range as
shown below. Excessive intake pressure
can cause serious accidents.
Convert this unit from natural gas to
Ÿ
propane or vice versa. Contact your local
dealer to get the right device for your gas
type. The manufacturer is not responsible
for any property and/or personal injury
2
caused by gas conversion.
2
Failure to follow these warnings can
Ÿ
result in serious personal injury, carbon
monoxide poisoning or death.
Maximum and minimum gas pressure:
Ÿ
Gas type
2
Natural Gas
Propane
Installation
Intake pressure
Min. 3.5" W.C. (0.87kPa)
Max. 10.5" W.C. (2.61kPa)
Min. 8.0" W.C. (1.99kPa)
Max. 13.0" W.C. (3.23kPa)
23