035-20499-001 Rev. B (1004)
Unitary Products Group
23
FILTER PERFORMANCE
The airflow capacity data published in Table 15 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 16.
NOTE:
The filter pressure drop values in Table 16 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 fil-
ter manufacturers.
* Washable Fibers are the type supplied with furnace (if supplied).
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 16:
Filter Performance - Pressure Drop Inches W.C. and (kPa)
AIRFLOW
RANGE
MINIMUM OPENING SIZE
FILTER TYPE
DISPOSABLE
WASHABLE FIBER*
PLEATED
1 Opening
2 Openings
1 Opening
2 Opening
1 Opening
2 Opening
1 Opening
2 Opening
Sq. in.
m
2
Sq. in.
m
2
In w.c.
Pa
In w.c.
Pa
In w.c.
Pa
In w.c.
Pa
In w.c.
Pa
In w.c.
Pa
0 - 750
230
.15
0.01
2.5
0.01
2.5
0.15
37
751 - 1000
330
.21
0.04
10
0.03
7.5
0.20
50
1001 - 1250
330
.21
0.08
20
0.07
17
0.20
50
1251 - 1500
330
.21
0.08
20
0.07
17
0.25
62
1501 - 1750
380
.25
658
.42
0.14
35
0.08
20
0.13
32
0.06
15
0.30
75
0.17
42
1751 - 2000
380
.25
658
.42
0.17
42
0.09
22
0.15
37
0.07
17
0.30
75
0.17
42
2001 & Above
463
.30
658
.42
0.17
42
0.09
22
0.15
37
0.07
17
0.30
75
0.17
42
FIELD INSTALLED ACCESSORIES - NON-ELECTRICAL
MODEL NO.
DESCRIPTION
USED WITH
1NP0580
PROPANE (LP) CONVERSION KIT
ALL MODELS
1SF0101
EXTERNAL SIDE FILTER RACK
ALL MODELS
1CT0302
CONCENTRIC INTAKE/VENT 2”
60, 80, 100 INPUT MBH
1CT0303
CONCENTRIC INTAKE/VENT 3”
100, 120 MBH
1HT0901
SIDEWALL VENT TERMINATION
ALL MODELS
1PS0501
HIGH ALTITUDE PRESSURE SWITCH KIT
(Does Not Include Orifices)
FOR APPLICATION
INFORMATION SEE FORM
035-20506-001
1PS0502
1PS0503
1PS0504
1PS0505
1PS0506
1BR0317
EXTERNAL BOTTOM FILTER RACK
17-1/2” CABINETS
1BR0321
21” CABINETS
1BR0324
24-1/2” CABINETS
1NK0301
CONDENSATE NEUTRALIZER KIT
ALL MODELS
