Tjernlund PAI-1 & 2O Combustion Air In-Forcer 8504038 Rev A 05/01 - Manual (Page 7)

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2. Install IN-FORCER 1/2” below subfloor making sure that unit is level. NOTE: 1/2” space must be followed so PVC pipe lines up
with hole template.
3. Level IN-FORCER on underside length wise and width wise making sure it is level in both planes, (See Diagram F).
4. Once determined IN-FORCER is level, secure to wall with provided screws, (See Diagram G). Note: Drill 4 - 1/4” holes
and use wall anchors provided if installing on masonry wall.
INSTALLATION OF PIPE
Schedule 40 or schedule 80 3” PVC pipe is recommended on the intake side of the IN-FORCER. Standard 6” metal vent or flex duct
is acceptable for discharge vent runs. If using flex duct, make sure adherence to manufacturers restrictions is followed.
Determine the inlet and outlet pipe lengths in equivalent feet. Each 90 degree 3” PVC elbow is equal to 5 feet of straight pipe, each
45 degree elbow is equal to 2-1/2 feet of straight pipe. Each 90 degree elbow of 6” metal vent pipe is equal to 10 feet of straight pipe,
each 45 degree elbow is equal to 5 feet of straight pipe. For an example of how to calculate equivalent feet, (See Diagram H).
Plan vent runs with desired CFM requirements in mind.
EQUIVALENT PIPE LENGTH CALCULATION EXAMPLE
Plan vent runs with desired CFM requirements in mind. It is recommended that the IN-FORCER be mounted as close to the dis-
charge location as possible to minimize the use of the more restrictive flex duct. For CFM capabilities see Page 4, Table 2 or 3.
If using flex duct on discharge side, a take-off section of 6” diameter metal pipe or a 6” diameter metal elbow will have to be installed
on the IN-FORCER . The flex duct will then have to be connected to the take-off section by duct tape or other suitable method,
(See Diagram I).
* Intake elbow & gooseneck do not need to be
included for equivalent length calculation. These
exterior PVC pipe fittings have already been
accounted for in CFM calculations, (See Page 4,
Table 2 or 3).
DIAGRAM F DIAGRAM G
DIAGRAM H
DIAGRAM I