Custom Rectangular tube adapter STL file 20x90 mm to 80x80 mm – transition: 60 mm 📦#3973

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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.
Generation date: 2025-11-28
3D Model Rectangular tube adapter STL file 20x90 mm to 80x80 mm – transition: 60 mm

3D model download

Free
  • rectangular-to-rectangular-duc_model3973-nb0_dd{id}.stl : 922 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 20 mm (≃0.79 in)
#2 side A internal height 90 mm (≃3.54 in)
#3 sleeve length on side A 40 mm (≃1 9/16 in)
#4 side B internal width 80 mm (≃3.15 in)
#5 side B internal height 80 mm (≃3.15 in)
#6 sleeve length on side B 30 mm (≃1 3/16 in)
#7 thickness 4 mm (≃0.16 in)
#8 transition length 60 mm (≃2 3/8 in)
#9 Y offset 0 mm (0 in)
#10 Z offset 0 mm (0 in)
#11 end chamfers none
Metadata Value
external width on side A 28 mm (≃1.10 in)
external height on side A 98 mm (≃3.86 in)
external width on side B 88 mm (≃3.46 in)
external height on side B 88 mm (≃3.46 in)
total length 130 mm (≃5 1/8 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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To search for a model based on your own parameters, go to the template page Rectangular-to-rectangular duct adapter 

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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
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Z offset 0 mm
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Rectangular duct transition downloadable as STL 3D file. Both ends have the same internal cross-section, 60x60 mm, with a square shape. The sleeve insertion length is the same on both sides, 20 mm. The transition section runs for 60 mm and the overall length is 100 mm, sleeves included. The shell is thick, with a wall thickness of 4 mm. No chamfers are applied at the ends; both inner and outer edges remain sharp. An offset of 30 mm along the Y axis is applied to side B with respect to side A.
Parameter Value Unit
side A internal width 60 mm
side A internal height 60 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 4 mm
transition length 60 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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Rectangle-to-rectangle duct adapter STL 3D file 100x40 mm to 60x60 mm – transition: 50 mm (📦 #4205)

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Rectangle-to-rectangle duct adapter STL 3D file 100x40 mm to 60x60 mm – transition: 50 mm
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
Y offset 0 mm
Z offset 0 mm
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Rectangular pipe adapter STL 3D file 110x110 mm to 80x80 mm – transition: 20 mm (📦 #3644)

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Rectangular tube adapter downloadable as STL 3D file. Side A uses an internal cross-section of 110x110 mm (square), whereas side B is 80x80 mm (square). Both side A and side B sleeves share the same insertion length of 30 mm. The transition section runs for 20 mm and the overall length is 80 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 110 mm
side A internal height 110 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
Y offset 0 mm
Z offset 0 mm
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Rectangle-to-rectangle duct adapter STL file 100x100 mm to 50.5x50.5 mm – transition: 25 mm (📦 #5839)

1 object(s) - format STL
Rectangle-to-rectangle duct adapter STL file 100x100 mm to 50.5x50.5 mm – transition: 25 mm
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.
Parameter Value Unit
side A internal width 100 mm
side A internal height 100 mm
sleeve length on side A 50 mm
side B internal width 50.5 mm
side B internal height 50.5 mm
sleeve length on side B 25 mm
thickness 3 mm
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Rectangular tube adapter STL file 42x58.6 mm to 80.5x80.5 mm – transition: 30 mm (📦 #5063)

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Rectangular tube adapter STL file 42x58.6 mm to 80.5x80.5 mm – transition: 30 mm
Rectangular pipe adapter downloadable as STL 3D file. Side A uses an internal cross-section of 42x58.6 mm (rectangular), whereas side B is 80.5x80.5 mm (square). On side A, the sleeve length is 16 mm, and on side B it is 25 mm. The transition section runs for 30 mm and the overall length is 71 mm, sleeves included. No chamfers are applied at the ends; both inner and outer edges remain sharp.
Parameter Value Unit
side A internal width 42 mm
side A internal height 58.6 mm
sleeve length on side A 16 mm
side B internal width 80.5 mm
side B internal height 80.5 mm
sleeve length on side B 25 mm
thickness 2 mm
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Rectangular pipe adapter STL file 38x54.6 mm to 80.5x80.5 mm – transition: 30 mm (📦 #5064)

1 object(s) - format STL
Rectangular pipe adapter STL file 38x54.6 mm to 80.5x80.5 mm – transition: 30 mm
Rectangular adapter exported as STL 3D file. The internal cross-section on side A is 38x54.6 mm (rectangular), while side B is 80.5x80.5 mm (square). On side A, the sleeve length is 16 mm, and on side B it is 25 mm. The transition section between the two sides is 30 mm long, for an overall length of 71 mm (side A sleeve, transition and side B sleeve). The ends are left without chamfers, with sharp inner and outer edges.
Parameter Value Unit
side A internal width 38 mm
side A internal height 54.6 mm
sleeve length on side A 16 mm
side B internal width 80.5 mm
side B internal height 80.5 mm
sleeve length on side B 25 mm
thickness 2 mm
transition length 30 mm
Y offset 0 mm
Z offset 0 mm
end chamfers none

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Rectangular duct adapter exported as STL 3D file. Side A offers an internal cross-section of 120x120 mm (square) and side B uses 80x80 mm (square). The sleeve insertion length is the same on both sides, 30 mm. Between the two sleeves, the transition section adds 20 mm, giving an overall length of 80 mm. The internal edges at the ends are chamfered to help guide the duct during insertion.
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
Y offset 0 mm
Z offset 0 mm
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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
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

Rectangular duct adapter STL 3D file 38x58.6 mm to 80.5x80.5 mm – transition: 30 mm (📦 #5062)

1 object(s) - format STL
Rectangular duct adapter STL 3D file 38x58.6 mm to 80.5x80.5 mm – transition: 30 mm
Rectangular pipe adapter provided as 3D STL file. The internal cross-section on side A is 38x58.6 mm (rectangular), while side B is 80.5x80.5 mm (square). The insertion length on side A is 16 mm, while on side B it is 25 mm. The transition section runs for 30 mm and the overall length is 71 mm, sleeves included. The ends are left without chamfers, with sharp inner and outer edges. Side B is offset by 15 mm along the Y axis and 15 mm along the Z axis relative to side A.
Parameter Value Unit
side A internal width 38 mm
side A internal height 58.6 mm
sleeve length on side A 16 mm
side B internal width 80.5 mm
side B internal height 80.5 mm
sleeve length on side B 25 mm
thickness 2 mm
transition length 30 mm
Y offset 15 mm
Z offset 15 mm
end chamfers none

Rectangular duct adapter STL 3D file 38x54.6 mm to 80.5x80.5 mm – transition: 52 mm (📦 #5098)

1 object(s) - format STL
Rectangular duct adapter STL 3D file 38x54.6 mm to 80.5x80.5 mm – transition: 52 mm
Rectangular tube adapter provided as 3D STL file. Side A offers an internal cross-section of 38x54.6 mm (rectangular) and side B uses 80.5x80.5 mm (square). The sleeve on side A provides an insertion length of 16 mm, and the sleeve on side B 25 mm. The transition section between the two sides is 52 mm long, for an overall length of 93 mm (side A sleeve, transition and side B sleeve). No chamfers are applied at the ends; both inner and outer edges remain sharp. An offset of 26 mm along the Y axis is applied to side B with respect to side A.
Parameter Value Unit
side A internal width 38 mm
side A internal height 54.6 mm
sleeve length on side A 16 mm
side B internal width 80.5 mm
side B internal height 80.5 mm
sleeve length on side B 25 mm
thickness 2 mm
transition length 52 mm
Y offset 26 mm
Z offset 0 mm
end chamfers none

Rectangle-to-rectangle duct adapter STL file 38x54.6 mm to 80.5x80.5 mm – transition: 52 mm (📦 #5099)

1 object(s) - format STL
Rectangle-to-rectangle duct adapter STL file 38x54.6 mm to 80.5x80.5 mm – transition: 52 mm
Rectangular duct transition exported as STL 3D file. The internal cross-section on side A is 38x54.6 mm (rectangular), while side B is 80.5x80.5 mm (square). On side A, the sleeve length is 16 mm, and on side B it is 25 mm. The transition section between the two sides is 52 mm long, for an overall length of 93 mm (side A sleeve, transition and side B sleeve). Inner and outer edges at both ends are left unchamfered. Relative to side A, side B is shifted by 26 mm along the Z axis.
Parameter Value Unit
side A internal width 38 mm
side A internal height 54.6 mm
sleeve length on side A 16 mm
side B internal width 80.5 mm
side B internal height 80.5 mm
sleeve length on side B 25 mm
thickness 2 mm
transition length 52 mm
Y offset 0 mm
Z offset 26 mm
end chamfers none

Rectangular tube adapter STL file 100x40 mm to 80x80 mm – transition: 80 mm (📦 #3771)

1 object(s) - format STL
Rectangular tube adapter STL file 100x40 mm to 80x80 mm – transition: 80 mm
Rectangular duct fitting exported as STL 3D file. Side A offers an internal cross-section of 100x40 mm (rectangular) and side B uses 80x80 mm (square). The sleeve insertion length is the same on both sides, 30 mm. The transition section runs for 80 mm and the overall length is 140 mm, sleeves included. Inner and outer edges at both ends are left unchamfered. Side B is offset by 30 mm along the Y axis and 30 mm along the Z axis relative to side A.
Parameter Value Unit
side A internal width 100 mm
side A internal height 40 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 80 mm
Y offset 30 mm
Z offset 30 mm
end chamfers none

Rectangular duct adapter STL 3D file 38x58.6 mm to 80.5x80.5 mm – transition: 30 mm (📦 #5061)

1 object(s) - format STL
Rectangular duct adapter STL 3D file 38x58.6 mm to 80.5x80.5 mm – transition: 30 mm
Rectangular duct fitting exported as STL 3D file. The internal cross-section on side A is 38x58.6 mm (rectangular), while side B is 80.5x80.5 mm (square). The insertion length on side A is 16 mm, while on side B it is 25 mm. The transition section runs for 30 mm and the overall length is 71 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 38 mm
side A internal height 58.6 mm
sleeve length on side A 16 mm
side B internal width 80.5 mm
side B internal height 80.5 mm
sleeve length on side B 25 mm
thickness 2 mm
transition length 30 mm
Y offset 0 mm
Z offset 0 mm
end chamfers inside

Rectangle-to-rectangle duct adapter STL file 96x51.2 mm to 40x26.2 mm – transition: 55 mm (📦 #4478)

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
end chamfers none