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3. Single wall "Chimney Connector" pipe may be used to join an appliance to the venting system, but if proper
clearances cannot be maintained from combustible materials, use Listed Double Wall "Chimney Connector" or
Factory Built Chimney pipe, refer to national or local codes for guidelines. Newer use Type B or Gas vents for venting
solid or Bio-Fuel heating appliances. Refer to the appliance manufacturer's installation instructions.
4. Disconnect power supply before making wiring connections to prevent electrical shock and equipment damage.
5. This equipment is designed to overcome minor negative pressure conditions. To ensure extreme negative pressure
does not exist, A COMPLETE GENERAL INSTALLATION INSPECTION MUST BE PERFORMED! See the General
Installation Inspection section of this manual.
6. Air flow adjustment MUST be made to ensure proper operation and appliance efficiency. This should be done at the
appliance exhaust outlet with a velocity meter or draft gauge. Refer to appliance manufacturer's setup instructions for
proper negative draft settings.
7. A barometric draft control MUST be properly installed to regulate the vent system's air flow. The draft control
responds to air flow fluctuations during operation. Fluctuations occur from wind loads on the outlet of the power vent,
house de-pressurization and ventilation requirements; use a Field Controls Type M or RC Barometric Draft Control.
8. The Field Controls DIP-1 pressure switch and the WMO-1 blocked vent switch MUST be properly installed and interlocked to
the appliance burner feed circuit.
Table 1
MAXIMUM EQUIVALENT FEET OF VENT PIPE
MAX
AT MAX BTU/HR
BTU/HR. INPUT
115,000
190,000
280,000
SELECTING THE SWG-AF POWER VENT
P
F
C
ROCEDURE
OR
ALCULATING
1. Calculate the total equivalent feet for each type of fitting used in the vent system from Table 2.
2. Calculate the total amount of feet for all straight lengths of vent pipe. (1 foot = 1 equivalent foot)
3. Add the total equivalent feet from all fittings with the total amount of feet from all straight lengths. This will approximate
the total equivalent feet of the vent system (See Table 1 for power vent sizing).
Table 2
VENT PIPE FITTINGS
SUDDEN REDUCER
OR INCREASER
FOR 3 *RATIOS (d/D)
UNIT SIZING CHART
AT 60% OF MAX
INPUT
BTU/HR INPUT
7
20
50
20
50
50
20
50
50
V
S
T
E
ENT
YSTEM
OTAL
EQUIVALENT FEET FOR VENT PIPE FITTINGS
90° ELBOW
45° ELBOW
¼
15
35
50
35
50
50
35
50
50
F
QUIVALENT
EET
VENT PIPE DIAMETER
4"
5"
6"
7
9
11
4
4
d/D
11
14
17
Page 3
VENTING WITH
VENT PIPE SIZE
4"
5"
6"
5"
6"
7"
6"
7"
8"
7"
8"
12
14
5
6
7
19
22
MODEL
SWG-4AF
SWG-4VR-AF
SWG-5AF
SWG-5VR-AF
SWG-6AF
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