All installations and services must be performed by qualified service personnel.
39
MINIMUM FILTER AREA REQUIRED (LENGTH X WIDTH)
FILTER TYPE
MAX.
RATED
VELOCIT
Y
EQUATION: REQUIRED CFM / MAX. RATED
VELOCITY X 144 = FILTER AREA (IN
2
)
HEATING VALUES PROVIDED IN CHART
BELOW
-050
-075
-100
-125
THERMO PRIDE *
SUPPLIED
PERMANENT
FILTER
600
FT/MIN
176 IN
2
264 IN
2
352 IN
2
440 IN
2
STANDARD
PERMANENT
FILTER
500
FT/MIN
211 IN
2
317 IN
2
422 IN
2
528 IN
2
DISPOSABLE
TYPE
FILTER
300
FT/MIN
352 IN
2
528 IN
2
704 IN
2
880 IN
2
TABLE 3
* The Thermo Pride 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.
NOTICE:
The filter areas in Table 3 are the
minimum
areas required based on the CFM generated by
the furnace for standard heating speeds only. The following formula can be used to determine the
minimum filter area required for cooling if the unit is equipped with cooling. This value should then be
compared to the value shown in Table 3 and the larger of the two should then be used for determining the
minimum filter area required for that installation.
FORMULA:
(tons of cooling) x (400 CFM per ton) x (144 square inches per foot) = filter area in sq.inches
(max. rated velocity of filter from Table 3 for the filter type)
EXAMPLE:
If you have a CLQS1-100 furnace with 4 tons of cooling and a standard permanent filter.
4 tons x 400 CFM x 144 = 460 square inches for cooling
500 fpm
For heating, a CLQS1-100 needs 422 square inches of filter. The filter system must be designed for the
larger CFM requirement determined for cooling of 460 square inches. A filter would have to be sized so
that the area (length X width) was at least 460 sq. in.
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