271043-UIM-B-0707
Unitary Products Group
27
FILTER PERFORMANCE
The airflow capacity data published in Table 17 represents blower per-
formance WITHOUT filters. To determine the approximate blower per-
formance of the system, apply the filter drop value for the filter being
used or select an appropriate value from the Table 18.
NOTE:
The filter pressure drop values in Table 18 are typical values for
the type of filter listed and should only be used as a guideline. Actual
pressure drop ratings for each filter type vary between filter manufactur-
ers.
APPLYING FILTER PRESSURE DROP TO
DETERMINE SYSTEM AIRFLOW
To determine the approximate airflow of the unit with a filter in place, fol-
low the steps below:
1.
Select the filter type.
2.
Select the number of return air openings or calculate the return
opening size in square inches to determine the proper filter pres-
sure drop.
3.
Determine the External System Static Pressure (ESP) without the
filter.
4.
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 3 to determine the total system static.
5.
If total system static matches a ESP value in the airflow table (i.e.
0.20 w.c. (50 Pa), 0.60 w.c. (150 Pa), etc.,) the system airflow cor-
responds to the intersection of the ESP column and Model/Blower
Speed row.
TABLE 18:
Filter Performance - Pressure Drop Inches W.C. and (kPa)
Airflow Range
Minimum
Opening Size
Filter Type
Disposable
Washable Fiber
Pleated
CFM
m
3
/min
in
2
cm
2
In W.C.
kPA
In W.C.
kPA
In W.C.
kPA
0 - 750
0 - 21.4
230
1484
0.01
0.00249
0.01
0.00249
0.15
0.03736
751 - 1000
21.25 - 28.32
330
2129
0.05
0.01245
0.05
0.01245
0.20
0.04982
1001 - 1250
28.33 - 35.40
330
2129
0.10
0.02491
0.10
0.02491
0.20
0.04982
1251 - 1500
35.41 - 42.48
330
2129
0.10
0.02491
0.10
0.02491
0.25
0.06227
1501 - 1750
42.49 - 49.55
380
2452
0.15
0.03736
0.14
0.03487
0.30
0.07473
1751 - 2000
49.56 - 56.63
380
2542
0.19
0.04733
0.18
0.04484
0.30
0.07473
2001 & Above
56.64 - Above
463
2987
0.19
0.04733
0.18
0.04484
0.30
0.07473
TABLE 19:
Field Installed Accessories - Non Electrical
MODEL NO.
DESCRIPTION
USED WITH
1NP0347
PROPANE (LP) CONVERSION KIT
ALL MODELS
1CT0302
CONCENTRIC INTAKE/VENT 2”
40, 60, 80, 100 INPUT MBH
1CT0303
CONCENTRIC INTAKE/VENT 3”
100, 120 MBH
1HT0901
SIDEWALL VENT TERMINATION KIT 3”
ALL MODELS
1HT0902
SIDEWALL VENT TERMINATION KIT 2”
ALL MODELS
1PS0501
HIGH ALTITUDE PRESSURE SWITCH KIT
(Does Not Include Orifices)
60 MBH
1PS0502
80/1200 MBH
1PS0503
80/1600, 100/1600, 120 MBH
1PS0505
100/2000 MBH
1PS0506
40 MBH
1NK0301
CONDENSATE NEUTRALIZER KIT
ALL MODELS
1SF0101
EXTERNAL SIDE FILTER RACK
ALL MODELS
1SR0302
SIDE RETURN FILTER KIT 1” FILTER
ALL MODELS
1SR0200
SIDE RETURN FILTER KIT 1-4” FILTER
ALL MODELS
1BR0114
BOTTOM RETURN FILTER KIT 1” FILTER
14-1/2” CABINETS
1BR0214
BOTTOM RETURN FILTER KIT 1-4” FILTER
14-1/2” CABINETS
1BR0117
BOTTOM RETURN FILTER KIT 1” FILTER
17-1/2” CABINETS
1BR0217
BOTTOM RETURN FILTER KIT 1-4” FILTER
17-1/2” CABINETS
1BR0121
BOTTOM RETURN FILTER KIT 1” FILTER
21” CABINETS
1BR0221
BOTTOM RETURN FILTER KIT 1-4” FILTER
21” CABINETS
1BR0124
BOTTOM RETURN FILTER KIT 1” FILTER
24-1/2” CABINETS
1BR0224
BOTTOM RETURN FILTER KIT 1-4” FILTER
24-1/2” CABINETS