Custom Rectangle-to-rectangle duct adapter STL file 100x100 mm to 50.5x50.5 mm – transition: 25 mm 📦#5839

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3D STL file for rectangular vent adapter. Side A uses an internal cross-section of 100x100 mm (square), whereas side B is 50.5x50.5 mm (square). The sleeve on side A provides an insertion length of 50 mm, and the sleeve on side B 25 mm. The transition section between the two sides is 25 mm long, for an overall length of 100 mm (side A sleeve, transition and side B sleeve). Internal chamfers at the ends improve assembly and provide a smoother insertion of the mating duct.
Generation date: 2026-01-03
3D Model Rectangle-to-rectangle duct adapter STL file 100x100 mm to 50.5x50.5 mm – transition: 25 mm

3D model download

Free
  • rectangular-to-rectangular-duc_model5839-nb0_dd{id}.stl : 1.7 Mo
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 100 mm (≃3 15/16 in)
#2 side A internal height 100 mm (≃3 15/16 in)
#3 sleeve length on side A 50 mm (≃1.97 in)
#4 side B internal width 50.5 mm (≃2 in)
#5 side B internal height 50.5 mm (≃2 in)
#6 sleeve length on side B 25 mm (≃0.98 in)
#7 thickness 3 mm (≃1/8 in)
#8 transition length 25 mm (≃0.98 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 106 mm (≃4 3/16 in)
external height on side A 106 mm (≃4 3/16 in)
external width on side B 56.5 mm (≃2.22 in)
external height on side B 56.5 mm (≃2.22 in)
total length 100 mm (≃3 15/16 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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Rectangular duct fitting exported as STL 3D file. The internal cross-section on side A is 150x150 mm (square), while side B is 55x55 mm (square). The insertion length on side A is 50 mm, while on side B it is 25 mm. Between the two sleeves, the transition section adds 25 mm, giving an overall length of 100 mm. The internal edges at the ends are chamfered to help guide the duct during insertion.
Parameter Value Unit
side A internal width 150 mm
side A internal height 150 mm
sleeve length on side A 50 mm
side B internal width 55 mm
side B internal height 55 mm
sleeve length on side B 25 mm
thickness 3 mm
transition length 25 mm
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Parameter Value Unit
side A internal width 110 mm
side A internal height 110 mm
sleeve length on side A 30 mm
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side B internal height 80 mm
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thickness 3 mm
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Parameter Value Unit
side A internal width 120 mm
side A internal height 120 mm
sleeve length on side A 30 mm
side B internal width 80 mm
side B internal height 80 mm
sleeve length on side B 30 mm
thickness 3 mm
transition length 20 mm
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Parameter Value Unit
side A internal width 100 mm
side A internal height 100 mm
sleeve length on side A 30 mm
side B internal width 35 mm
side B internal height 35 mm
sleeve length on side B 50 mm
thickness 2 mm
transition length 30 mm
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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 77 mm
side B internal height 34 mm
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thickness 2 mm
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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
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Parameter Value Unit
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Parameter Value Unit
side A internal width 122.3 mm
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Parameter Value Unit
side A internal width 122.3 mm
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Parameter Value Unit
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side A internal height 34 mm
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Parameter Value Unit
side A internal width 50.5 mm
side A internal height 50.5 mm
sleeve length on side A 20 mm
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side B internal height 43 mm
sleeve length on side B 20 mm
thickness 3 mm
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1 object(s) - format STL
Rectangular duct adapter STL 3D file 50x50 mm to 43x43 mm – transition: 20 mm
3D STL file for rectangular duct fitting. Side A uses an internal cross-section of 50x50 mm (square), whereas side B is 43x43 mm (square). The sleeve insertion length is the same on both sides, 20 mm. Between the two sleeves, the transition section adds 20 mm, giving an overall length of 60 mm. No chamfers are applied at the ends; both inner and outer edges remain sharp.
Parameter Value Unit
side A internal width 50 mm
side A internal height 50 mm
sleeve length on side A 20 mm
side B internal width 43 mm
side B internal height 43 mm
sleeve length on side B 20 mm
thickness 3 mm
transition length 20 mm
Y offset 0 mm
Z offset 0 mm
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1 object(s) - format STL
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Rectangular adapter exported as STL 3D file. Side A offers an internal cross-section of 50x50 mm (square) and side B uses 43x43 mm (square). Both side A and side B sleeves share the same insertion length of 20 mm. Between the two sleeves, the transition section adds 20 mm, giving an overall length of 60 mm. External chamfers are added at the ends to make it easier to push the adapter into ducts or pipes.
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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side B internal height 43 mm
sleeve length on side B 20 mm
thickness 3 mm
transition length 20 mm
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1 object(s) - format STL
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Rectangular conduit adapter downloadable as STL 3D file. Side A offers an internal cross-section of 100x40 mm (rectangular) and side B uses 60x60 mm (square). The sleeve insertion length is the same on both sides, 20 mm. The transition section between the two sides is 50 mm long, for an overall length of 90 mm (side A sleeve, transition and side B sleeve). Inner and outer edges at both ends are left unchamfered.
Parameter Value Unit
side A internal width 100 mm
side A internal height 40 mm
sleeve length on side A 20 mm
side B internal width 60 mm
side B internal height 60 mm
sleeve length on side B 20 mm
thickness 3 mm
transition length 50 mm
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1 object(s) - format STL
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Parameter Value Unit
side A internal width 38 mm
side A internal height 58.6 mm
sleeve length on side A 16 mm
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thickness 2 mm
transition length 30 mm
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1 object(s) - format STL
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Rectangular vent adapter provided as 3D STL file. Side A offers an internal cross-section of 20x90 mm (rectangular) and side B uses 80x80 mm (square). The sleeve on side A provides an insertion length of 40 mm, and the sleeve on side B 30 mm. Between the two sleeves, the transition section adds 60 mm, giving an overall length of 130 mm. The shell is thick, with a wall thickness of 4 mm. The ends are left without chamfers, with sharp inner and outer edges.
Parameter Value Unit
side A internal width 20 mm
side A internal height 90 mm
sleeve length on side A 40 mm
side B internal width 80 mm
side B internal height 80 mm
sleeve length on side B 30 mm
thickness 4 mm
transition length 60 mm
Y offset 0 mm
Z offset 0 mm
end chamfers none

Rectangle-to-rectangle duct adapter STL 3D file 50x50 mm to 43x43 mm – transition: 50 mm (📦 #8627)

1 object(s) - format STL
Rectangle-to-rectangle duct adapter STL 3D file 50x50 mm to 43x43 mm – transition: 50 mm
Rectangular conduit adapter exported as STL 3D file. The internal cross-section on side A is 50x50 mm (square), while side B is 43x43 mm (square). Both side A and side B sleeves share the same insertion length of 20 mm. The transition section between the two sides is 50 mm long, for an overall length of 90 mm (side A sleeve, transition and side B sleeve). No chamfers are applied at the ends; both inner and outer edges remain sharp.
Parameter Value Unit
side A internal width 50 mm
side A internal height 50 mm
sleeve length on side A 20 mm
side B internal width 43 mm
side B internal height 43 mm
sleeve length on side B 20 mm
thickness 3 mm
transition length 50 mm
Y offset 0 mm
Z offset 0 mm
end chamfers none

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1 object(s) - format STL
Rectangle-to-rectangle duct adapter STL file 96x51.2 mm to 40x26.2 mm – transition: 55 mm
3D STL file for rectangular vent adapter. The internal cross-section on side A is 96x51.2 mm (rectangular), while side B is 40x26.2 mm (rectangular). The sleeve insertion length is the same on both sides, 30 mm. Between the two sleeves, the transition section adds 55 mm, giving an overall length of 115 mm. The ends are left without chamfers, with sharp inner and outer edges. An offset of 12.5 mm along the Z axis is applied to side B with respect to side A.
Parameter Value Unit
side A internal width 96 mm
side A internal height 51.2 mm
sleeve length on side A 30 mm
side B internal width 40 mm
side B internal height 26.2 mm
sleeve length on side B 30 mm
thickness 2 mm
transition length 55 mm
Y offset 0 mm
Z offset 12.5 mm
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1 object(s) - format STL
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Parameter Value Unit
side A internal width 120 mm
side A internal height 120 mm
sleeve length on side A 40 mm
side B internal width 94 mm
side B internal height 94 mm
sleeve length on side B 24 mm
thickness 1 mm
transition length 20 mm
Y offset 0 mm
Z offset 0 mm
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1 object(s) - format STL
Rectangular duct adapter STL file 91.2x46.4 mm to 40x21 mm – transition: 55 mm
Rectangular duct connector downloadable as STL 3D file. Side A offers an internal cross-section of 91.2x46.4 mm (rectangular) and side B uses 40x21 mm (rectangular). Each sleeve provides an insertion length of 30 mm. Between the two sleeves, the transition section adds 55 mm, giving an overall length of 115 mm. Inner and outer edges at both ends are left unchamfered. An offset of 12.7 mm along the Z axis is applied to side B with respect to side A.
Parameter Value Unit
side A internal width 91.2 mm
side A internal height 46.4 mm
sleeve length on side A 30 mm
side B internal width 40 mm
side B internal height 21 mm
sleeve length on side B 30 mm
thickness 2 mm
transition length 55 mm
Y offset 0 mm
Z offset 12.7 mm
end chamfers none