E. Air Filters Mounted Internal to Furnace:
Fig. 10: Internal filter rack.
: 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.
| Maximum | Model Number |
| |
Filter Type | Air Velocity |
| ||
| (ft/min) | OL6 |
| Qty |
*Thermo Products | 600 | 280 in² |
| 2 |
Supplied Permanent |
| |||
|
|
|
| |
Standard | 500 | 576 in² |
| 2 |
Permanent |
| |||
|
|
|
| |
Disposable | 300 | 960 in² |
| 2 |
|
|
|
|
|
Table 4: 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.
NOTICE: Any internal stiffeners used in the filter must not be removed, although they can be cut to size as needed.
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