Custom Rectangle-to-rectangle duct adapter STL 3D file 39.5x29 mm to 39.5x29 mm – transition: 20 mm 📦#11394

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Rectangular vent adapter downloadable as STL 3D file. On both side A and side B, the internal cross-section is 39.5x29 mm, with a rectangular geometry. The sleeve on side A provides an insertion length of 15 mm, and the sleeve on side B 10 mm. The transition section between the two sides is 20 mm long, for an overall length of 45 mm (side A sleeve, transition and side B sleeve). The shell is very thick, with 6 mm wall thickness. Internal chamfers are added at the ends to make assembly and duct insertion easier.
Generation date: 2026-09-02
3D Model Rectangle-to-rectangle duct adapter STL 3D file 39.5x29 mm to 39.5x29 mm – transition: 20 mm

3D model download

Free
  • rectangular-to-rectangular-duc_model11394-nb0_dd{id}.stl : 2.4 Ko
STL Mesh quality : Linear deflection 0.0005 Angular deflection 0.05
No compliance warranty No compliance warranty
(Internal and private use, non-commercial – no distribution – no derivatives)
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Values for this model

This model was generated by the Rectangular-to-rectangular duct adapter template, with the following values:
Parameter Value
#1 side A internal width 39.5 mm (≃1 9/16 in)
#2 side A internal height 29 mm (≃1.14 in)
#3 sleeve length on side A 15 mm (≃0.59 in)
#4 side B internal width 39.5 mm (≃1 9/16 in)
#5 side B internal height 29 mm (≃1.14 in)
#6 sleeve length on side B 10 mm (≃0.39 in)
#7 thickness 6 mm (≃1/4 in)
#8 transition length 20 mm (≃0.79 in)
#9 Y offset 0 mm (0 in)
#10 Z offset 0 mm (0 in)
#11 end chamfers inside
Metadata Value
external width on side A 51.5 mm (≃2.03 in)
external height on side A 41 mm (≃1 5/8 in)
external width on side B 51.5 mm (≃2.03 in)
external height on side B 41 mm (≃1 5/8 in)
total length 45 mm (≃1.77 in)
illustration of the parameters
Parameter overview

Labels are used in the naming of the downloaded 3D files.

Parameter Label
#1 side A internal width widRA
#2 side A internal height heiRA
#3 sleeve length on side A lenSA
#4 side B internal width widRB
#5 side B internal height heiRB
#6 sleeve length on side B lenSB
#7 thickness thi
#8 transition length tra
#9 Y offset ofsY
#10 Z offset ofsZ
#11 end chamfers cha

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Parameter Value Unit
side A internal width 60 mm
side A internal height 60 mm
sleeve length on side A 20 mm
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Parameter Value Unit
side A internal width 50 mm
side A internal height 50 mm
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Parameter Value Unit
side A internal width 50 mm
side A internal height 50 mm
sleeve length on side A 20 mm
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Parameter Value Unit
side A internal width 50.5 mm
side A internal height 50.5 mm
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Parameter Value Unit
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Parameter Value Unit
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Parameter Value Unit
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Parameter Value Unit
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Parameter Value Unit
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Parameter Value Unit
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Parameter Value Unit
side A internal width 200 mm
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Parameter Value Unit
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Parameter Value Unit
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1 object(s) - format STL (5.0/5) 1 vote(s)
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Rectangular duct sleeve downloadable as STL 3D file. The internal cross-section on side A is 200x90 mm (rectangular), while side B is 80x80 mm (square). The insertion length on side A is 40 mm, while on side B it is 30 mm. Between the two sleeves, the transition section adds 60 mm, giving an overall length of 130 mm. Wall thickness is generous (4 mm). The ends are left without chamfers, with sharp inner and outer edges.
Parameter Value Unit
side A internal width 200 mm
side A internal height 90 mm
sleeve length on side A 40 mm
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side B internal height 80 mm
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thickness 4 mm
transition length 60 mm
Y offset 0 mm
Z offset 0 mm
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1 object(s) - format STL
Rectangular duct adapter STL 3D file 200x20 mm to 100x50 mm – transition: 50 mm
Rectangular duct adapter provided as 3D STL file. The internal cross-section on side A is 200x20 mm (rectangular), while side B is 100x50 mm (rectangular). Each sleeve provides an insertion length of 20 mm. Between the two sleeves, the transition section adds 50 mm, giving an overall length of 90 mm. Internal chamfers at the ends improve assembly and provide a smoother insertion of the mating duct. An offset of 25 mm along the Z axis is applied to side B with respect to side A.
Parameter Value Unit
side A internal width 200 mm
side A internal height 20 mm
sleeve length on side A 20 mm
side B internal width 100 mm
side B internal height 50 mm
sleeve length on side B 20 mm
thickness 3 mm
transition length 50 mm
Y offset 0 mm
Z offset 25 mm
end chamfers inside

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1 object(s) - format STL
Rectangle-to-rectangle duct adapter STL file 104x34 mm to 100x30 mm – transition: 50 mm
Rectangular pipe adapter downloadable as STL 3D file. The internal cross-section on side A is 104x34 mm (rectangular), while side B is 100x30 mm (rectangular). The insertion length on side A is 25 mm, while on side B it is 15 mm. The transition section runs for 50 mm and the overall length is 90 mm, sleeves included. The internal edges at the ends are chamfered to help guide the duct during insertion.
Parameter Value Unit
side A internal width 104 mm
side A internal height 34 mm
sleeve length on side A 25 mm
side B internal width 100 mm
side B internal height 30 mm
sleeve length on side B 15 mm
thickness 2 mm
transition length 50 mm
Y offset 0 mm
Z offset 0 mm
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1 object(s) - format STL
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Parameter Value Unit
side A internal width 40 mm
side A internal height 26 mm
sleeve length on side A 10 mm
side B internal width 36 mm
side B internal height 27 mm
sleeve length on side B 10 mm
thickness 2 mm
transition length 20 mm
Y offset 0 mm
Z offset 0 mm
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1 object(s) - format STL
Rectangular pipe adapter STL 3D file 77x34 mm to 34x77 mm – transition: 30 mm
Rectangular adapter downloadable as STL 3D file. The internal cross-section on side A is 77x34 mm (rectangular), while side B is 34x77 mm (rectangular). Each sleeve provides an insertion length of 30 mm. Between the two sleeves, the transition section adds 30 mm, giving an overall length of 90 mm. Internal chamfers are added at the ends to make assembly and duct insertion easier.
Parameter Value Unit
side A internal width 77 mm
side A internal height 34 mm
sleeve length on side A 30 mm
side B internal width 34 mm
side B internal height 77 mm
sleeve length on side B 30 mm
thickness 2 mm
transition length 30 mm
Y offset 0 mm
Z offset 0 mm
end chamfers inside