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Recommended size of filter
t
W
MODEL(Btu/h)
mm
12-24K
406.4
30-48K
495.3
60K
584.2
Installation Place
Vertical installations
DUCT CONNECTIONS：Air supply and return may be handled in one of several ways best suited to
the installation (See table for dimensions for duct inlet and outlet connections). The vast majority of
problems encountered with combination cooling systems can be linked to improperly designed or
installed duct systems, it is therefore highly important to the success of an installation that the
duct system be properly designed and installed. Use flexible duct collars to minimize the transmission
of vibration/noise into the conditioned space. Where return air duct is short, or where sound is
liable to be a problem, sound absorbing glass fiber should be used inside the duct. Insulation of duct
work is a must where it runs through an uncooled space during the cooling season. The use of a vapor
barrier is recommended to prevent absorption of moisture from the surrounding air into the insulation.
The supply air duct should be properly sized by use of a transition to match unit opening. All ducts
should be suspended using flexible hangers and never fastened directly to the structure. This unit
is not designed for nonducted (freeblow) applications. Duct work should be fabricated and
installed in accordance with local and/or national switchs.
W
(unit: mm/inch)
D
t
inch
mm
inch
mm
inch
16
508
20
25.4
19-1/2
508
20
25.4
23
508
20
25.4
Horizontal installations
Note
The filter in this product is for energy
efficiency sampling tests only. The use of this
D
filter meets the requirements of the UL900
standard.
1
1
1
(610 mm)
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24''
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