Thermo Products CBD1-100N, CHB1-125N, CHB1-75N USE of NON-THERMO Pride Filter Retention Means

All installations and services must be performed by qualified service personnel.

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3. USE OF NON-THERMO PRIDE FILTER RETENTION MEANS

If a method other than the Thermo Pride filter rack is selected for retention of the filter and/or use of a different filter type is desired, see Table 3 for minimum size guidelines for selecting a filter system for the CHB1 or CDB1 furnaces.

MINIMUM FILTER AREA REQUIRED (LENGTH X WIDTH, SQ. IN.)

TABLE 3

FILTER TYPE	MAXIMUM	REQUIRED CFM/(FILTER VELOCITY RATING X 144)=
	RATE		FILTER (IN2)
	AIR
	VELOCITY		FURNACE MODEL
		CHB1,CDB1-50	CHB1,CDB1-75	CHB1,CDB1-100	CHB1,CDB1-125
*THERMO PRODUCTS	600 FT./MIN.	172 IN.2 *	254 IN.2*	328 IN.2*	402 IN.2*
SUPPLIED
PERMANENT FILTER
STANDARD	500 FT./MIN.	208 IN.2	304 IN.2	394 IN.2	484 IN.2
PERMANENT FILTER
DISPOSABLE TYPE	300 FT./MIN.	344 IN.2	506 IN.2	656 IN.2	804 IN.2
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 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.

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