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All installations and services must be performed by qualified service personnel.
FILTER REPLACEMENT
See Table 1 for minimum heating filter areas required for the different types of filters available
should the filter used require replacement.
If the unit is equipped with cooling, contact your installer or a qualified service person to
determine the minimum filter area required for the different filter types and your cooling system.
FILTER TYPE
THERMO PRIDE *
SUPPLIED
PERMANENT FILTER
STANDARD
PERMANENT FILTER
DISPOSABLE TYPE
FILTER
* 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 the length required.
Figure 3
MINIMUM FILTER AREA REQUIRED
MAX.
RATED
VELOCITY
-050
600 FT/MIN
176 IN
500 FT/MIN
211 IN
300 FT/MIN
352 IN
TABLE 1
FILTER AREA FOR HEATING
(LENGTH X WIDTH, SQ. IN.)
-075
2
2
264 IN
2
2
317 IN
2
2
528 IN
13
-100
-125
2
2
352 IN
440 IN
2
2
422 IN
528 IN
2
2
704 IN
880 IN
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