Carrier 39CZ Installation, Operation And Maintenance Instructions page 9

Air handling unit
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3 - INSTALLATION
Where possible (door nearby, footprint, etc.) the clamps may be tightened on the inside with TH 6 x 60 bolts.
Sizes 25 to 75
Sizes 100 to 600
An optional decorative trim is available for bottom 39CZ CL units only.
■ Dual-flow assembly with stacked casings (A) and (B)
The unit can be assembled in one of two of ways depending on its size:
C
25 to 75 units: affix the feet of block B to the intermediate panel 
using two TH 6x20 screws. Holes are provided for this purpose.
C
100 to 600 units: affix the brackets to the feet of block B, and the mounts to the panel using the screws provided. Assemble using 
two screws (6x120), washers and nuts.
Block
B
9

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