5715184-BIM-A-0519
Johnson Controls Ducted Systems
9
SECTION III: FILTERS
FILTER INSTALLATION
All applications require the use of a field installed filter. All filters and
mounting provision must be field supplied.
Filters must be installed external to the furnace cabinet.
DO NOT
attempt to install filters inside the furnace.
1. Air velocity through throwaway type filters must not exceed 300 ft per minute
(91.4 m/min). All velocities over this require the use of high velocity filters.
2. Do not exceed 1800 CFM using a single side return and a 16 x 25 filter. For
CFM greater than 1800, you can use two side returns or one side and the
bottom or one side return with a transition to allow use of a 20 x 25 filter.
SIDE RETURN - UPFLOW ONLY
Locate the L shaped corner locators. These indicate the size of the cut-
out to be made in the furnace side panel. Refer to Figure 10.
Install the side filter rack following the instructions provided with that
accessory. If a filter(s) is provided at another location in the return air
system, the ductwork may be directly attached to the furnace side
panel.
FIGURE 9:
Dimensions (Upflow Configuration Shown)
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Table 2:
Cabinet and Duct Dimensions - MM9E
BTUH (kW)
Input
Nominal
CFM (m
3
/min)
Cabinet
Size
Cabinet Dimensions (Illustrated in Figure 9)
Approximate
Operating Weights
A (in.)
A (cm)
B (in.)
B (cm)
C (in.)
C (cm)
lbs
60 (17.6)
1200 (34.0)
B
17 1/2
44.4
16 3/8
41.6
13 1/4
33.7
122
80 (23.4)
1200 (34.0)
B
17 1/2
44.4
16 3/8
41.6
14 3/4
37.5
126
80 (23.4)
1600 (45.3)
C
21
53.3
19 7/8
50.5
16 1/2
41.9
136
80 (23.4)
2000 (56.6)
C
21
53.3
19 7/8
50.5
16 1/2
41.9
139
100 (29.3)
1600 (45.3)
C
21
53.3
19 7/8
50.5
18 1/4
46.4
142
NOTICE
Single side return above 1800 CFM is approved as long as the filter
velocity does not exceed filter manufacturer’s recommendation and
a transition is used to allow use on a 20x25 filter.
Table 3:
Recommended Filter Sizes (High Velocity 600 FPM)
CFM
(m³/min)
Cabinet
Size
Side
(in.)
Bottom
(in.)
1200 (34.0)
B
16 x 25
16 x 25
1600 (45.3)
C
16 x 25
20 x 25
2000 (56.6)
C
(2) 16 x 25
20 x 25
FIGURE 10:
Side Return Cutout Markings
IMPORTANT:
Some accessories such as electronic air cleaners
and pleated media may require a larger side opening. Follow the
instructions supplied with that accessory for side opening require-
ments. Do not cut the opening larger than the dimensions for the
Optional Return Air Cutout shown in Figure 9.
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