Tjernlund PAI-1 & 2O Combustion Air In-Forcer 8504038 Rev A 05/01 - Manual (Page 5)

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COMBUSTION CFM NECESSARY FOR APPLIANCE
The type of appliance the IN-FORCER is being interlocked with will have to be considered when determining the minimum CFM for
combustion purposes. Consult chart for recommended minimum CFM needed to fulfill combustion air requirements, (See Table 1).
DETERMINING CFM CAPABILITIES
Reference the chart of the correct model selecting either the PAI-1 or PAI-2 series. The readings for CFM are determined with vari-
ous inlet and outlet pipe lengths. The charts are read the same way except the right hand chart takes into consideration an intake
elbow that is extended up to 4’ above exterior penetration for below grade applications or to extend above anticipated snow line. The
top row of the chart has inlet 3” diameter PVC pipe lengths from 2 to 20 feet. The left hand column has outlet 6” diameter pipe
lengths from 0 to 20 feet. Pipe lengths must be calculated in equivalent feet, (See Diagram H, Page 6). With correct model selected,
determine pipe lengths and read intersection of inlet and outlet pipe lengths to determine CFM. Consult Tjernlund Products for infor-
mation on CFM data with pipe runs longer than those indicated on the charts.
INSTALLATION (TOOLS REQUIRED)
• 3-1/2” hole saw or reciprocating saw • 5/16”, 1/4” nut runner or socket • Wire cutter/stripper
• Drill and 1/2” bit • Blade screwdriver
CUTTING PVC OPENING THROUGH WALL
Note: Before cutting opening through wall, consider layout of PVC pipe runs and consult performance charts above to make sure
CFM necessary for equipment is achieved with pipe run lengths.
Note:
The PAI-1 Series maximum
capacity is 59 CFM.
The PAI-2 Series maximum
capacity is 80 CFM.
TABLE 1
TABLE 3
PAI-2 SERIES
PAI-1 SERIES
TABLE 2