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You must have 20mm or more space between the ceiling and the bottom of indoor unit. Otherwise, the noise from
the vibration of indoor unit may bother the user.When the ceiling is under construction, the hole for check-up must
be made to take service, clean and repair the unit.
It is possible to install the unit at an height of between 2.2~2.5m from the ground, if the unit has a duct with a well
defined lenght (300mm or more), to avoid fan motor blower contact.
If you install the cassette or duct type indoor unit on the ceiling with humidity over 80%, you must apply extra
10mm of polyethylene foam or other insulation with similar material on the body of the indoor unit.
Construction Standard for Inspection Hole.
1) In case, the ceiling is textile, Inspection hole dose not need.
2) In case, the ceiling is plaster board, Inspection hole depends on Inside height of the ceiling.
a. Height is more than 1m : Only “B” [Inspection for PBA] is applied.
b. Height is less than 1m : Both “A” & ”B” are applied.
c. “A” & ”B” are inspection holes.
Unit Width(W)
“A”=W+100mm “B”=500mm
Unit Depth(D)+50mm
20mm or more
20mm or more
A C
B
D
Front
Back
Indoor Unit A B C D Front/Back
MA duct 1150x480x260 1150x480 1150x480 480x260 480x260
Insulate the front and back side in
proper size at the same time when
insulating the suction duct and
discharge duct.
Thickness: more than 10mm
Insulate the end of the pipe and some curved area by using separate insulator.
Insulate the discharge and suction part at the same time when you insulate connection duct.
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