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The supply duct from the unit through a wall may be installed without clearance. However, minimum unit clearances as shown in the
appendix must be maintained. The supply duct should be provided with an access panel large enough to inspect the air chamber
downstream of the heat exchanger. A cover should be tightly attached to prevent air leaks.
For duct flange dimensions on the unit refer to the Unit Dimension illustration in the appendix.
For down-discharge applications, the ductwork should be attached to the roof curb prior to installing the unit. Ductwork dimen-
sions are shown in the roof curb installation manual.
If desired, supply and return duct connections to the unit may be made with flexible connections to reduce possible unit operating
sound transmission.
F
ILTERS
Even though a return air filter is not supplied with this unit,
there must be a means of filtering all return air. All units may be
externally filtered.
Refer to the unit filter size chart in the appendix for filter size
information.
Filters installed external to the unit should be sized in accordance with their manufacturer recommendations. A throwaway filter
must be sized for a maximum face velocity of 300 feet per minute.
Filter Installation
IMPORTANT NOTE: When installing a filter, the air flow arrows on the filter must point toward the circulator blower.
VENTING
NOTE: Venting is self-contained. Do not modify or block.
I
- F
H
NSTALLATION
LUE
OOD
1. Locate the flue hood assembly box from the blower compartment.
2. Slide screen over flanges on the lower flue hood.
3. Slide screen into hood.
4. Using the three screws provided, attach the hood (with the opening
facing down) over the flue exhaust opening in the utility panel.
I
- C
NSTALLATION
OMBUSTION
1. Locate the second hood.
2. Using the three screws provided, attach the hood (with
the opening facing down) to the heat exchanger access
door.
E
XHAUST
A
I
H
IR
NTAKE
OOD
LOWER
FLUE
HOOD
LIP
13
HOOD
SCREEN
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