Zenith ZW6500R Owner's Manual page 12

Installation
Clearance
Proper clearance enhances the cooling efficiency of the unit and prevents heat
radiation of the condenser.
1. If a storm window presents interference, fasten a 2" wide wood strip to the inner
window sill across the full width of the sill. The wood strip should be thick
enough to raise the height of the window sill so that the unit can be installed
without interference by the storm window frame.
2. See Figure. B. The top of the wood strip should be approximately 3/4" higher
than the storm window frame (Storm Window Frame) or wood strip (Outdoors)
to help condensation to drain properly to the outside.
3. Install a second wood strip (approximately 6" long by 11/2"wide and same
thickness as first strip) in the center of the sill flush against the back off the
inner sill. This will raise the L bracket as shown Figure. B.
4. If the distance between Storm Window Frame and Wood Strip Mounted on Top
of Inner Sill is more than 1", two of wood strips are not necessary.
Inner Sill
In
IU
Outdoors
Wood Strip Mounted 1" Max.
on Top of Inner Sill BP" I I_'_
^, 3/4"
"_ ulearance
-_ Storm
J_ I #v _ Window
L
Indoors I IU Outdoors
Figure. A Figure. B
12 Room Air Conditioner