Harman Stove Company PB 105, Installation & Operating Manual

13

Outside Air

Outside air is optional, although it may be required

by some building codes.  The benefit of outside air is
higher efficiency  and reduced venting restrictions mainly
noticed in small and very tight houses.

To install outside air, use 2 3/4”" I.D.galvinized steel

flex pipe, part # 2-00-08544 (  12’ 6” length) or part #
2-00-08545 ( 25’ length) See Fig. 6. There is a break-
away hole on the rear panel which must be removed
before connecting the flex pipe. See Fig. 7. The pipe
should be run outside and terminate 3 feet or more  be-
low or 1 foot or more to the side of the vent pipe outlet.
Never terminate the outside air above the vent pipe out-
let. The maximum length of this pipe is 20 feet. Inlet
cover part number 1-10-09542 should be used to keep
birds, rodents etc.out of the inlet pipe. See Fig.6.

NOTE: If outside air is installed, the inlet cover

should not be placed in an area where drifting of
snow or ice will build up, blocking the intake air
supply.

  The Outside Air knockout is located on the face

of the Feeder Cover. It is pre-cut except for several
small tabs. There is also a filler plate screwed to the
inside to cover the top of the hole after the Outside Air
Pipe has been installed. This will allow for removal of
the Feeder Cover without disconnecting the Outside Air
Pipe. See Fig. 7.

Only metal Intake Flex should be used for the

Outside Air Supply connection.

Only a screened or rodent protected  Outside Air

Intake cover should be used as an outside weather cover.

The Outside Air Intake Pipe is inside the Feeder

Cover and to the right of the feeder motor. The 2 3/4”
steel flex pipe is made to slide over the outside of the Air
Intake Pipe.

See Fig. 8. It should be held into place with

some silicone, foil tape, or a hose clamp.
(not supplied)

Heat Reclaiming Ventilation System
(HRV)

When installing in a house with a Heat Reclaiming

Ventilation System (HRV) be sure the system is bal-
anced and is not creating a negative pressure in the house.

Inlet Cover part#
1-10-09542

NOTE: If the boiler is installed with the out-

side air system no adjustments to the HRV should be
necessary.

Installation

Outside Air Inlet Pipe

Hopper/Feeder Swing 
Plate Knob

Outside Air Inlet Pipe

Hopper/Feeder Swing 
Plate Knob

Outside Air Pipe 
Knockout

Feeder Cover

Outside Air Pipe 
Knockout

Feeder Cover

Fig. 6

Fig. 7

Fig. 8