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Duct Connection
Duct Connection
• After securely connect the duct with the duct connection flange, wrap it with a commercial aluminium
tape so that air cannot be leaked.
• Adjust the duct from the ceiling so that no force is applied to the main body of the ventilation system.
• Always use two ducts at the outdoor with the heat insulating material for prevention of dewing.
CAUTION
• Check that there are no foreign materials
(paper, vinyl, etc) or cutoff powders in the
duct before connecting the duct.
• Take care so that shock may not be applied
to the damper plate within the main body
when performing the duct connection work.
• It is recommended to perform adiabatic treat-
ment even to the duct pipe at the indoor side
where ambient temperature is expected when
the main body of the ventilation system for cool-
ing in summer.
• The change of air discharge grill's location should be examined when the cold draft from air dis-
charge grill is feared. The fan is driving while defrost operation, and the cold air is often blowing.
18 Ventilator
Outdoor duct slop
: More than 1/30(toward the wall)
Obtaining of right distance
(preventing penetration of rain water)
Rapid Bending
Excessive Bending
Aluminum tape
(Locally procured)
• Take care so that work may not be performed
as in the left figure. Otherwise, it may cause
reduction of air volume or abnormal noise.
Duct to OA
Too Close Bending
to Outlet
Outdoor duct
Slope :
Over 1/30
Insulation material
Make sure there
(Locally procured)
is no slack in the duct.
Duct connecting flange
Aluminum tape (Locally procured)
Heat Insulating Material
Aluminium
Main Body
Duct Connection Flange
Rapid Reduction of
Duct Diameter
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