Rear grille selection
Select an appropriate grille to ensure that the unit operates properly and that does not malfunction or
lose capacity.
• For the rear grille, use a standard grille that meets the following conditions.
– There is at least 65% free space
– There is 85% or more free space recommended
Free area is defined as the minimum area of the opening in an air inlet or outlet through which air
can pass.
Free area (Percent [%]) equals the X dimension divided by the Y dimension.
Relationship between free area on the rear grille
40
50
60
70
80
90
100
110
40 50 60 70 80 90 100 110
Free area
Capacity
(%)
(%)
Free area 65%
Free area 86%
(Standard grille)
Sleeveless
installtion
NOTE: Do not use a rear grille with a louver of 12-13/16 in (325 mm) or less within a range of
15-3/8 in (390 mm) from the left end, as resistance increases and the capacity drop signifi-
cantly.
15-3/8 (390)
Grille
15-3/8 (390)
Louver part
Greater than 12-13/16 (325)
Unit: in (mm)
- 84 -
1-3. Installation space
1. Wall sleeve
OPTIONAL
PARTS
OPTIONAL
PARTS
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