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All installations and services must be performed by qualified service personnel.
NOTICE: The minimum coil pan clearance for a sectional or drum type heat exchanger is three
inches unless specified otherwise by the individual coil manufacturer.
NOTICE: The minimum return air temperature is 55° F.
D. AIR FILTERS MOUNTED INTERNAL TO FURNACE:
cCAUTION: Failure to comply with minimum filter installation requirements may affect
the performance and/or void the warranty on this unit.
If a method other than internal Thermo Pride filter rack is selected for retention of the filters
and/or use of a different filter type is desired, refer to Table 4 below for minimum sizing
guidelines for selecting filter for the unit.
Filter Type
*Thermo Products
Supplied Permanent
Standard
Permanent
Disposable
Table 3: Minimum Required Filter Area (in square inches)
* The Thermo Products supplied filter can be cut to size to fit other filter retention systems
as long as the minimum size requirement is met.
Fig. 2: Internal filter rack.
Maximum
Air Velocity
Model Number
OL6
(ft/min)
600
280 in²
500
576 in²
300
960 in²
6
OL8
Qty
480 in²
2
576 in²
2
960 in²
2
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