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Found four delta duct 3d models.

$25
cg-trader
NVIDIA Tesla M2090 cooling shroud blower fan duct M2050 M2070 3D model
free
grabcad
Delta Rocket - RC Glider or EDF Jet
free
thingiverse
kossel800 k800 ver.hero delta 3dprinter deltabot arm
free
thingiverse
kossel800 k800 ver.hero delta 3dprinter deltabot arm