Design Technical Manual

Table Of Contents
Unit : in. (mm)
10-2. SNOW HOOD
In cold locations where freezing temperatures and snow may occur, install inlet and outlet
hoods to help maintain stable operation and to help avoid snow damage.
PRECAUTION
All components including snow hoods, frame and screws are to be locally purchased.
Prior to installation of snow hoods, install unit on equipment foundation.
Provide equipment foundation high enough to keep the unit base above the snow level.
Foundation width should not exceed unit width.
Position snow hood and units in an orientation that limits exposure to prevailing winds.
In multi unit installations, it may be necessary to install snow hoods before units are set in
place.
Static pressure loss of the air ow path including snow hoods must be .32in. WG (80Pa) or
less.
Unit noise levels may increase with snow hood installed.
EXAMPLE OF INSTALLING SNOW HOOD
Caution
The depth D of the snow hood should be 19-11/16 (500) or more.
Provide ample slope so that snow will not accumulate on top of the snow hood. In addition,
configure the snow hood so that snow will not fall off and accumulate at the hood inlet.
Opening height E of the snow hood should be 23-5/8 (600) or more.
19-11/16 (500)
19-11/16 (500) 19-11/16 (500)
D
11-7/16 (290)
11-7/16
(290)
62-1/16 (1576)
23-5/8 (600)
15-3/4 (400)
D
E
Equipment
foundation
Equipment
foundation
Equipment
foundation
Provide a slope
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OUTDOOR
UNITS
OUTDOOR
UNITS