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INSTRUCTIONS FOR FIELD INSTALLATION
OF JA AND 90 SERIES DAMPERS
TABLE 1 HOLE LOCATION
ORIGINAL The two centermost* louver rows are
LENGTH numbered below counting from left or
OF COVER right side of end of cover.
2 ft. No. 3 and 4
3 ft. No. 4 and 5
3
1
/2 ft. No. 5 and 6
4 ft. No. 6 and 7
5 ft. No. 8 and 9
6 ft. No. 10 and 11
7 ft. No. 11 and 12
8 ft. No. 13 and 14
*Information in Table 1 is only for original cover length. If cover is cut, damper
must also be cut so that the hole in cover matches lead screw nut in damper.
PACKING LIST
Damper
Lead screw
Knob
Bushing
Nut
Damper hinge: 2 required for dampers 3
1
⁄2 ft. and shorter
3 required for dampers 4ft. and longer
Hole template
FIGURE 1
FIGURE 2
DRILLING INSTRUCTIONS
1. Locate the space between the two centermost* louver rows on the
cover (see Table1). As a check, this space is approximately equal in
distance from the two ends of the cover. The hole must be made
EXACTLY in the center of this SMALL SPACE between the two center-
most rows of louvers. Find this location using the template supplied or
from dimensions given on template and Figure 1.
2. USE OF HOLE TEMPLATE Center the template over the two
centermost rows of louvers on the side of the cover facing the room.
Slide two of the template legs into the uppermost louver openings as
shown in Figure 1. The other two template legs should be placed over
the two rows of louvers so that only the metal space between these
two rows is visible through the slot between the two legs of the template.
This is to assure that the template is squared off and so that the mark
made on the cover through the hole in the template (A) will be centered
between the two rows of louvers. Mark with pencil or scriber (Figure 2).
3. Drill or clean punch a
13
⁄32” diameter hole where marked. If drilling,
you will find it easier to drill a smaller hole on that mark. Then open
the hole to final
13
⁄32” diameter and deburr hole.
PRINTED IN USA 998 Publication No.JD-40