FILTER PERFORMANCE
The airflow capacity data published in the “Blower Perfor- mance” table listed above represents blower performance WITHOUT filters. To determine the approximate blower per- formance of the system, apply the filter drop value for the fil- ter being used or select an appropriate value from the “Filter Performance” table shown.
NOTE: The filter pressure drop values in the “Filter Perfor- mance” table shown are typical values for the type of filter listed and should only be used as a guideline. Actual pres- sure drop ratings for each filter type vary between filter manu- facturer.
FILTER SIZES
CFM | Cabinet | Top Return | |
Size | Filter in | ||
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1200 | B | (2) 14 x 20 | |
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1600 | C | (2) 14 x 20 | |
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2000 | C | (2) 14 x 20 | |
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2000 | D | (2) 14 x 20 | |
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NOTE: All filters must be high velocity cleanable type.
FILTER PERFORMANCE - PRESSURE DROP INCHES W.C. AND (KPA)
Airflow Range | Minimum |
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Opening Size | Disposable | Washable Fiber | Pleated | ||
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CFM | in2 | In W.C. | In W.C. | In W.C. | |
0 - 750 | 230 | 0.01 | 0.01 | 0.15 | |
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751 - 1000 | 330 | 0.05 | 0.05 | 0.20 | |
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1001 - 1250 | 330 | 0.10 | 0.10 | 0.20 | |
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1251 - 1500 | 330 | 0.10 | 0.10 | 0.25 | |
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1501 - 1750 | 380 | 0.15 | 0.14 | 0.30 | |
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1751 - 2000 | 380 | 0.19 | 0.18 | 0.30 | |
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2001 & Above | 463 | 0.19 | 0.18 | 0.30 | |
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APPLYING FILTER PRESSURE DROP TO DETERMINE SYSTEM AIRFLOW
To determine the approximate airflow of the unit with a filter in place, follow the steps below:
1.Select the filter type.
2.Determine the External System Static Pressure (ESP) without the filter.
UNIT CLEARANCES TO COMBUSTIBLES
3.Select a filter pressure drop from the table based upon the number of return air openings or return air opening size and add to the ESP from Step 2 to determine the total system static.
If total system static matches a ESP value in the airflow table (i.e. 0.20, 0.60, etc,) the system airflow corresponds to the intersection of the ESP column and Model/Blower Speed row.
Application | Top | Front | Rear | Left Side | Right Side | Flue | Floor/Bottom | Closet | Alcove | Attic | Line | |
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In. | In. | In. | In. | In. | In. | In. | ||||||
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Downflow | 1 | 3 | 0 | 0 | 0 | 0 | 1* | Yes | Yes | Yes | NA | |
Horizontal | 0 | 3 | 0 | 1 | 1 | 0 | 0 | Yes | Yes | Yes | Yes† |
*Combustible floor base or air conditioning coil required for use on combustible floor.
†Line contact only permitted between lines formed by the intersection of the rear panel and side panel (top in horizontal position) of the furnace jacket and build- ing joists, studs or framing.
4 | Unitary Products Group |
