IM 798 AE Self-Contained Unit Ventilator / Page 11 of 60
4.
Check to see if the horizontal divider on the louver is the
same height as the top horizontal splitter rail of the wall sleeve.
The louver frame must be permanently mounted in the wall.
5.
Before installing the louver in the opening, place a heavy bead
of caulk along the top and two sides of the frame that come in
contact with the walls of the opening. Use a flexible, water-
proof caulk such as silicone.
6.
Once the louver has been placed in the opening, further
mechanical fastening may be desired or required. Fasten in a
manner appropriate to the installation (see pages 15-17 for
typical louver installation methods). Care must be taken if
fasteners are to be placed in the frame. If this is necessary,
remove the louver by removing the screws that hold it in place.
Drill holes in the desired locations and fasten with flat head
screws. Be sure these screws do not interfere with the reinstal-
lation. Shims must be placed between the louver and the wall
so it won't be distorted. After the louver has been properly
positioned, secure with fasteners.
In masonry wall applications, the louver may be permanently
mounted by placing mortar around the top and sides in order to
prevent it from being removed. Mortar keys may be attached to the
louver, if necessary.
Installing Louvers
Typical Installation Methods
If the outside opening has not yet been made, see figures 23
through 28 for the recommended locations and the job-specific plans
for the exact location. Follow national and local codes.
Wall Opening
Cut the wall opening so that it is slightly larger than the louver
being installed (see Table 2, page 8).
For dimensions, see Table 4 & 5, page 10. If the opening is already
there, measure to be sure there is a minimum of 3/8" (9mm) clearance
around all sides. For masonry installations, follow national and local
codes and install a lintel above all louvers.
Outside Air Plenum
In thick wall applications, the portion of the wall between the
louver and the unit is the outside air plenum. Line this plenum area
with 3/8" (9 mm) sealed cement mortar or other suitable material. In
some applications, the job specifications require a metal sleeve
connection between the louver and the unit. If using such a sleeve,
properly caulk it for a weather tight seal to help prevent moisture
from seeping into the wall.
Sealing is critical in preventing freeze-ups, cold drafts, air
infiltration, and to prevent moisture from entering the wall or
room. Be sure the wall is smooth, square, and provides a
suitable mating surface.
Louver Installation Considerations
The standard louver is an aluminum, vertical, divided blade design
complete with bird screen. This louver is also available with flanges
and/or with a heavy-duty exterior lattice grille.
1.
Figure 18 & 19 shows a detail of a typical louver. Before
installation, carefully examine the louver and note the loca-
tion of the bird screen and the notches (drain holes). The
louver must be installed with the small opening at the top,
notches at the bottom and the bird screen toward the room. If
the louver is to be installed in a masonry wall, there must also
be a lintel to support the existing wall above the louver
2.
Measure the opening to be sure there is adequate clearance for
the louver around the sides. Observe the opening in relation to
the wall sleeve and unit. For proper unit operation, the louver
must be centered left to right and top to bottom to the wall
sleeve. If the louver is of such a dimension that it extends
above, below, or beyond the wall sleeve, then these areas must
be blocked off airtight (Figure 21).
3.
If the wall sleeve does not extend into the wall far enough to
meet the louver, field fabricated splitter(s) must be provided.
The splitter(s) need to extend far enough to engage the louver
in order to form a proper seal (see splitter length details
beginning on page 21.
Shaded area of louver must
be blocked off & made air-
and watertight, by install-
ing contractor.
Exaggerated oversize
louver or wall opening.
Unit Wall
Sleeve
Figure 21 – Oversize Wall Opening
Caulk top and two
sides of the frame
that come in contact
with the walls of the
opening
Field fabricated
splitters engage the
louver to form a proper
seal, and seal at ends
where they come in
contact with the wall
opening
Seal
Seal
Seals
Wall
Sleeve
Unit
Figure 22 – Typical Field Fabricated Splitters
CAUTION
!
See page 25 for detail of attaching splitters to wall sleeve.
CAUTION
!
See important information on bottom splitter seal, and drainage
from condenser section drain pan (figures 49 & 50).
Louvers by AAF
®
-HermanNelson
®
provide proper airflow.
Proper unit performance has not been verified with louvers by
others.
CAUTION
!
Step 2 – Installing Louver
