Tjernlund PAI-1 & 2O Combustion Air In-Forcer 8504038 Rev A 05/01 - Manual (Page 8)

If flex duct will be directed to higher levels, instead of down, it is recommended that a 6” metal elbow be connected to the
IN-FORCER at discharge. Flex duct can then be connected to the elbow. All flex duct runs should be tapered gradually to prevent
severe bends and kinks that may add resistance and reduce CFM. Make bends with as large a radius as possible and keep flex duct
as straight as possible for extended runs, (See Diagram J).
The discharge should terminated three feet from a barometric draft control or intake grille of an appliance. If this is not possible termi-
nate on sides or opposite side of intake on appliance. Never terminate within 3 feet from the front or intake side of appliance. Supply
duct should also terminate a minimum of 18 inches above floor or other obstructions if perpendicular to them, (See Diagram K).
CONFINED SPACE OR CLOSET INSTALLATIONS
The IN-FORCER can be installed in a closet or combustion air can be ducted into the closet. First, determine the CFM necessary for
proper combustion of appliance, (See Table 1, Page 4). Second, determine CFM capabilities with proposed vent runs, (See Page 4
Table 2 or 3). Keep in mind that all vent pipe equivalent lengths must be calculated, (See Diagram H, Page 6).
The discharge should terminate three feet from a barometric draft control or air intake of an appliance. If this is not possible terminate
on sides or opposite side of intake on appliance. Never terminate within 3 feet from the front or intake side of appliance. Discharge
should also terminate a minimum of 18 inches above floor or other obstructions if perpendicular to them, (See Diagram K).
With today’s higher efficient appliances, constricted spaces seldom experience elevated ambient temperatures. Because the
IN-FORCER brings in outdoor air to the space, the potential for elevated ambient temperatures is further reduced. Ventilation open-
ings are not required for the proper operation of the IN-FORCER nor for combustion air.
INSTALLING INTAKE ELBOW
1. Insert PVC pipe through wall and cut to desired exterior termination length. NOTE: A minimum of two feet should be used for PVC
section that is connected to IN-FORCER PVC coupler. This will leave room for servicing IN-FORCER.
2. Apply PVC cement to exterior pipe joints and make connections as shown depending on exterior layout, (See Diagram L).
3. After PVC pipe, intake elbow and IN-FORCER are completely installed and secured, apply a bead of exterior rated caulk around
pipe on exterior of building, (See Diagram M).
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DIAGRAM M
OR
DIAGRAM L
DIAGRAM J
DIAGRAM K