www.DaikinApplied.com 13
IM 830-6
Figure 23: Outdoor Air Intake and Insulated Duct Work
The following general suggestions are offered only to stress their
importance; however, there are additional important factors that must
be considered. Assistance in the design of ductwork can be found
in the ASHRAE Handbook and SMACNA publications, as well as
other recognized authorities.
Flexible Boot
5 Feet
Same Size As
Unit Discharge
Acoustically Lined
Insulated Ductwork to Prevent Sweating,
Heat Loss or Heat Gain
Unit Ventilator
Intake
Louver
Outdoor Air
NOTICE
CAUTION
!
Avoid a rear outdoor return air arrangement, where strong prevailing
winds have a direct path into the unit ventilator outdoor air opening.
Strong air turbulence can cause undesirable sound levels, unit
operating issues and property damage.
Figure 24: Outdoor Air Arrangement With Prevailing Winds
Unit
Ventilator
Unit
Ventilator
Top Outdoor Air Duct
Bottom Return Air
NO!
YES!
Bottom Return Air
Rear Outdoor Air Duct
Outdoor - prevailing winds
Building Exterior