15
Ductwork recommendations
Free discharge or abrupt discharge into a plenum will be
avoided, each fan discharge should have a mimum of 1,5
meter duct to avoid an excess of pressure drop.
On the units with 3 fans, each fan can be individually
ducted or the single fan will be ducted with a ‘’pants’’
section. The single fan is identified on the submittal
drawing.
On the units with 4 fans, each fan can be individually
ducted or each double fan can be ducted with a ‘’pants’’
section.
Caution : When attaching supply ductwork to con-
denser inlet, ensure no fasteners pierce the coil.
Figure10 - Recommended ductwork
Note : To avoid air recirculation through the ductwork, we recommend to put backdraft dampers only on the double
fan situated on the right side when facing the condensing coil for the RTRA 109 HE and 110 HE, if the selected avail-
able static pressure is 150 Pa or below. KT = 1 (No recovery of the dynamic pressure).
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1500 mm
pant section
Unit frame
Flex connection
Duct work
Customer supplied
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