Webasto BlueCool Classic Series
INSTALLATION
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3) Blower Outlets:
90° turns with flexible ducts directly from blower outlets should be avoided at all
costs as they introduce severe restrictions in the air flow. All WEBASTO blowers can be rotated
through 45° steps so as to obtain a straight-line outlet from the blower.
See Figure 6 for approved installation.
Figure 6
Rotating Blower Outlet
4) Transition Boxes:
Transition boxes behind supply air grills essentially serve the following purpose:
Serve as an expansion volume for the air-flow to be reduced in velocity and therefore reduce air noise
when crossing the outlet louvres. It follows therefore that the depth of the transition box is an
important factor to allow dispersion of the air flow. The table (see Figure 7) gives the necessary
information as to the minimum dimensions advisable for such transition boxes.
Figure 7
Transition Box Information
5) Return Grill Offset:
It is best to avoid placing a return air grill directly opposite the finned coil
surface of an air-handler. This will inevitably allow propagation of direct blower or compressor motor
noise through the grill. Always try to offset the grill so the return air does not flow directly to the coil
inlet. This will lower direct noise propagation significantly.
Air Flow
Air Flow
Blower Rotated to Minimize
Friction Losses
DUCT DIAM.
80 mm (3”)
100 mm (4”)
125 mm (5”)
150 mm (6”)
MINIMUM VALUE OF “H”
100 mm (4”)
120 mm (4¾”)
140 mm (5½”)
165 mm (6½”)
Deflection curve for longitudinal entry
transition boxes
H
H
Summary of Contents for BlueCool Classic Series
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