Bulletin 30-020.007
Copyright © 2019 Unico Inc. Page 7
If installing the unit in an attic, avoid placing the unit
above a bed or other place where noise is critical. The
ideal location is above a central hall, a closet, a
bathroom, or any normally unoccupied space.
The unit can also be installed in a closet, crawlspace,
or basement. If the local codes allow, the unit may be
installed in the garage provided the ductwork is well
sealed, especially the return duct.
Although the unit is not designed for outdoor use, it
may be located outside provided adequate weather
protection is used; typically, a roof installation
requires mounting on blocks with a sheet metal cover
or cap to protect the unit from rain and extreme
weather conditions.
Table 1. Return Air Box Opening
Be sure to position the return air box and filter near the
unit allowing at least one 90° bend in the return duct
for proper acoustical performance (refer to Figure 3 for
a typical horizontal attic installation). The section on
Return Air Ducts in the manual provides more details.
All modules except the 4860 cooling module are
designed to fit through a 14-inch (356 mm) opening,
typical of a joist spaced at 16-inch (406 mm) center
distance. The 4860 module requires an 18.5-inch (470
mm) opening. If no access is provided, an opening
must be cut. It is suggested to use the opening required
for the return air box, especially in an attic installation.
The opening for the return air box is listed in Table 1.
If the joists or studs are less than 16-inches (406-mm)
center-to-center or running the wrong direction it will
be necessary to cut and header the joists.
Figure 3. Typical Horizontal Attic Installation
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