Filter
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Legend and Notes for Tables 10C and 10D
LEGEND
ESP — External Static Pressure
NOTES:
1. Maximum allowable fan speed is 18.3 r/s for unit sizes 028 and
034; 20 r/s for all other sizes.
2. Fan performance isbased on deductions for wet coil, clean51-mm
filters, and unit casing. See right for factory-supplied filter pres-
sure drop.
3. Refer to fan motor and drive tables for additional data.
Factory-Supplied Filter Pressure Drop — SI
UNIT
AIRFLOW
(L/s)
PRESSURE DROP
(Pa)
40RM
007
850
1150
1450
13
20
28
40RM
40RMQ
40RMS
008
1000
1400
1800
17
27
38
40RMS
010
1200
1600
2000
21
32
45
40RM
40RMQ
40RMS
012
1450
1900
2350
28
42
56
40RM
40RMS
014
1750
2350
2950
15
24
33
40RM
40RMQ
40RMS
016
2100
2800
3500
20
30
42
40RM
40RMS
024
2900
3800
4700
32
47
64
40RM
40RMS
028
3500
4700
5900
36
55
76
40RM
40RMS
034
4250
5650
7050
47
71
98
Replacing Filters — Filters can be removed and in-
stalled from either side of the unit. Install new filters in units
that have one fan as follows:
1. Remove the side access panel (retain screws).
2. Remove the filter retainer clip.
3. Remove old filters by tilting them and lifting them out of
the filter track. See Fig. 12 and 22.
4. Reverse the procedure to install new filters.
To install new filters in larger units that have 2 fans, fol-
low the preceding steps, but use the factory-supplied
filter hook to slide filters within reach for removal. The
filter hook is shipped inside the unit in the baserail.
Do not operate unit without air filters.
Fig. 22 — Filter Removal/Replacement
39