Custom Rectangular duct adapter STL file 168x32 mm to 203x203 mm – transition: 170 mm 📦#12179

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Rectangular duct fitting provided as 3D STL file. Side A uses an internal cross-section of 168x32 mm (rectangular), whereas side B is 203x203 mm (square). Each sleeve provides an insertion length of 20 mm. The transition section between the two sides is 170 mm long, for an overall length of 210 mm (side A sleeve, transition and side B sleeve). Inner and outer edges at both ends are left unchamfered.
Generation date: 2026-10-01
3D Model Rectangular duct adapter STL file 168x32 mm to 203x203 mm – transition: 170 mm

3D model download

Free
  • rectangular-to-rectangular-duc_model12179-nb0_dd{id}.stl : 1.2 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 168 mm (≃6 5/8 in)
#2 side A internal height 32 mm (≃1 1/4 in)
#3 sleeve length on side A 20 mm (≃0.79 in)
#4 side B internal width 203 mm (≃8 in)
#5 side B internal height 203 mm (≃8 in)
#6 sleeve length on side B 20 mm (≃0.79 in)
#7 thickness 3 mm (≃1/8 in)
#8 transition length 170 mm (≃6 11/16 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 174 mm (≃6.85 in)
external height on side A 38 mm (≃1 1/2 in)
external width on side B 209 mm (≃8.23 in)
external height on side B 209 mm (≃8.23 in)
total length 210 mm (≃8.27 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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1 object(s) - format STL
Rectangle-to-rectangle duct adapter STL file 165x31.8 mm to 209x209 mm – transition: 150 mm
3D STL file for rectangular pipe adapter. Side A uses an internal cross-section of 165x31.8 mm (rectangular), whereas side B is 209x209 mm (square). Both side A and side B sleeves share the same insertion length of 25.4 mm. The transition section runs for 150 mm and the overall length is 200.8 mm, sleeves included. No chamfers are applied at the ends; both inner and outer edges remain sharp.
Parameter Value Unit
side A internal width 165 mm
side A internal height 31.8 mm
sleeve length on side A 25.4 mm
side B internal width 209 mm
side B internal height 209 mm
sleeve length on side B 25.4 mm
thickness 3 mm
transition length 150 mm
Y offset 0 mm
Z offset 0 mm
end chamfers none

Rectangular pipe adapter STL 3D file 171x32 mm to 210.2x209.9 mm – transition: 55 mm (📦 #12113)

1 object(s) - format STL
Rectangular pipe adapter STL 3D file 171x32 mm to 210.2x209.9 mm – transition: 55 mm
3D STL file for rectangular duct adapter. The internal cross-section on side A is 171x32 mm (rectangular), while side B is 210.2x209.9 mm (rectangular). The insertion length on side A is 50.8 mm, while on side B it is 31.8 mm. The transition section runs for 55 mm and the overall length is 137.6 mm, sleeves included. No chamfers are applied at the ends; both inner and outer edges remain sharp.
Parameter Value Unit
side A internal width 171 mm
side A internal height 32 mm
sleeve length on side A 50.8 mm
side B internal width 210.2 mm
side B internal height 209.9 mm
sleeve length on side B 31.8 mm
thickness 3 mm
transition length 55 mm
Y offset 0 mm
Z offset 0 mm
end chamfers none

Rectangular duct adapter STL file 190x100 mm to 186.7x96.7 mm – transition: 190 mm (📦 #12015)

1 object(s) - format STL
Rectangular duct adapter STL file 190x100 mm to 186.7x96.7 mm – transition: 190 mm
Rectangular duct sleeve exported as STL 3D file. Side A offers an internal cross-section of 190x100 mm (rectangular) and side B uses 186.7x96.7 mm (rectangular). The sleeve insertion length is the same on both sides, 30 mm. Between the two sleeves, the transition section adds 190 mm, giving an overall length of 250 mm. Internal chamfers are added at the ends to make assembly and duct insertion easier.
Parameter Value Unit
side A internal width 190 mm
side A internal height 100 mm
sleeve length on side A 30 mm
side B internal width 186.7 mm
side B internal height 96.7 mm
sleeve length on side B 30 mm
thickness 3 mm
transition length 190 mm
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Z offset 0 mm
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Rectangular pipe adapter STL file 190x100 mm to 187.7x97.7 mm – transition: 180 mm (📦 #12016)

1 object(s) - format STL
Rectangular pipe adapter STL file 190x100 mm to 187.7x97.7 mm – transition: 180 mm
Rectangular pipe adapter exported as STL 3D file. Side A offers an internal cross-section of 190x100 mm (rectangular) and side B uses 187.7x97.7 mm (rectangular). The sleeve insertion length is the same on both sides, 30 mm. The transition section runs for 180 mm and the overall length is 240 mm, sleeves included. Internal chamfers are added at the ends to make assembly and duct insertion easier.
Parameter Value Unit
side A internal width 190 mm
side A internal height 100 mm
sleeve length on side A 30 mm
side B internal width 187.7 mm
side B internal height 97.7 mm
sleeve length on side B 30 mm
thickness 2 mm
transition length 180 mm
Y offset 0 mm
Z offset 0 mm
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Rectangular pipe adapter STL file 220x90 mm to 220x90 mm – transition: 120 mm (📦 #11932)

1 object(s) - format STL
Rectangular pipe adapter STL file 220x90 mm to 220x90 mm – transition: 120 mm
Rectangular conduit adapter exported as STL 3D file. On both side A and side B, the internal cross-section is 220x90 mm, with a rectangular geometry. Both side A and side B sleeves share the same insertion length of 50 mm. The transition section between the two sides is 120 mm long, for an overall length of 220 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 220 mm
side A internal height 90 mm
sleeve length on side A 50 mm
side B internal width 220 mm
side B internal height 90 mm
sleeve length on side B 50 mm
thickness 3 mm
transition length 120 mm
Y offset 0 mm
Z offset 0 mm
end chamfers none

Rectangular tube adapter STL 3D file 220x73 mm to 220x73 mm – transition: 120 mm (📦 #4273)

1 object(s) - format STL
Rectangular tube adapter STL 3D file 220x73 mm to 220x73 mm – transition: 120 mm
Rectangular adapter provided as 3D STL file. Side A and side B share the same internal cross-section, 220x73 mm, with a rectangular profile. Each sleeve provides an insertion length of 50 mm. The transition section between the two sides is 120 mm long, for an overall length of 220 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 220 mm
side A internal height 73 mm
sleeve length on side A 50 mm
side B internal width 220 mm
side B internal height 73 mm
sleeve length on side B 50 mm
thickness 3 mm
transition length 120 mm
Y offset 0 mm
Z offset 0 mm
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Rectangular pipe adapter STL file 203x203 mm to 203x203 mm – transition: 85 mm
Rectangular vent adapter exported as STL 3D file. Side A and side B share the same internal cross-section, 203x203 mm, with a square profile. The sleeve insertion length is the same on both sides, 30 mm. The transition section between the two sides is 85 mm long, for an overall length of 145 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 203 mm
side A internal height 203 mm
sleeve length on side A 30 mm
side B internal width 203 mm
side B internal height 203 mm
sleeve length on side B 30 mm
thickness 3 mm
transition length 85 mm
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1 object(s) - format STL
Rectangular duct adapter STL file 203.2x203.2 mm to 203.2x203.2 mm – transition: 60 mm
Rectangular duct adapter exported as STL 3D file. Side A and side B share the same internal cross-section, 203.2x203.2 mm, with a square profile. The sleeve on side A provides an insertion length of 20 mm, and the sleeve on side B 30 mm. Between the two sleeves, the transition section adds 60 mm, giving an overall length of 110 mm. No chamfers are applied at the ends; both inner and outer edges remain sharp.
Parameter Value Unit
side A internal width 203.2 mm
side A internal height 203.2 mm
sleeve length on side A 20 mm
side B internal width 203.2 mm
side B internal height 203.2 mm
sleeve length on side B 30 mm
thickness 3 mm
transition length 60 mm
Y offset 0 mm
Z offset 0 mm
end chamfers none

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Rectangular tube adapter STL file 120x120 mm to 100x55 mm – transition: 180 mm
Rectangular vent adapter downloadable as STL 3D file. The internal cross-section on side A is 120x120 mm (square), while side B is 100x55 mm (rectangular). On side A, the sleeve length is 20 mm, and on side B it is 10 mm. The transition section between the two sides is 180 mm long, for an overall length of 210 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 120 mm
side A internal height 120 mm
sleeve length on side A 20 mm
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side B internal height 55 mm
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Rectangular adapter provided as 3D STL file. Side A uses an internal cross-section of 171x108 mm (rectangular), whereas side B is 100x108 mm (rectangular). Both side A and side B sleeves share the same insertion length of 5 mm. The transition section runs for 70 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 171 mm
side A internal height 108 mm
sleeve length on side A 5 mm
side B internal width 100 mm
side B internal height 108 mm
sleeve length on side B 5 mm
thickness 3 mm
transition length 70 mm
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Z offset 0 mm
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Rectangular pipe adapter STL 3D file 150x150 mm to 150x150 mm – transition: 90 mm (📦 #7849)

1 object(s) - format STL
Rectangular pipe adapter STL 3D file 150x150 mm to 150x150 mm – transition: 90 mm
Rectangular pipe adapter downloadable as STL 3D file. Both ends have the same internal cross-section, 150x150 mm, with a square shape. Each sleeve provides an insertion length of 45 mm. The transition section runs for 90 mm and the overall length is 180 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 150 mm
side A internal height 150 mm
sleeve length on side A 45 mm
side B internal width 150 mm
side B internal height 150 mm
sleeve length on side B 45 mm
thickness 2 mm
transition length 90 mm
Y offset 0 mm
Z offset 0 mm
end chamfers inside

Rectangle-to-rectangle duct adapter STL 3D file 200x50 mm to 195x44 mm – transition: 80 mm (📦 #10596)

1 object(s) - format STL
Rectangle-to-rectangle duct adapter STL 3D file 200x50 mm to 195x44 mm – transition: 80 mm
Rectangular duct adapter downloadable as STL 3D file. The internal cross-section on side A is 200x50 mm (rectangular), while side B is 195x44 mm (rectangular). The sleeve on side A provides an insertion length of 20 mm, and the sleeve on side B 30 mm. Between the two sleeves, the transition section adds 80 mm, giving an overall length of 130 mm. Internal chamfers are added at the ends to make assembly and duct insertion easier. Side B is offset by 14 mm along the Z axis relative to side A.
Parameter Value Unit
side A internal width 200 mm
side A internal height 50 mm
sleeve length on side A 20 mm
side B internal width 195 mm
side B internal height 44 mm
sleeve length on side B 30 mm
thickness 2 mm
transition length 80 mm
Y offset 0 mm
Z offset 14 mm
end chamfers inside

Rectangular duct adapter STL file 200x50 mm to 195x44 mm – transition: 80 mm (📦 #10594)

1 object(s) - format STL
Rectangular duct adapter STL file 200x50 mm to 195x44 mm – transition: 80 mm
Rectangular duct adapter downloadable as STL 3D file. Side A offers an internal cross-section of 200x50 mm (rectangular) and side B uses 195x44 mm (rectangular). The insertion length on side A is 20 mm, while on side B it is 30 mm. The transition section between the two sides is 80 mm long, for an overall length of 130 mm (side A sleeve, transition and side B sleeve). The internal edges at the ends are chamfered to help guide the duct during insertion. Side B is offset by 15 mm along the Y axis relative to side A.
Parameter Value Unit
side A internal width 200 mm
side A internal height 50 mm
sleeve length on side A 20 mm
side B internal width 195 mm
side B internal height 44 mm
sleeve length on side B 30 mm
thickness 2 mm
transition length 80 mm
Y offset 15 mm
Z offset 0 mm
end chamfers inside

Rectangular duct adapter STL 3D file 200x90 mm to 80x80 mm – transition: 60 mm (📦 #3870)

1 object(s) - format STL (5.0/5) 1 vote(s)
Rectangular duct adapter STL 3D file 200x90 mm to 80x80 mm – transition: 60 mm
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

Rectangle-to-rectangle duct adapter STL 3D file 220x90 mm to 180x95 mm – transition: 30 mm (📦 #3980)

1 object(s) - format STL
Rectangle-to-rectangle duct adapter STL 3D file 220x90 mm to 180x95 mm – transition: 30 mm
3D STL file for rectangular adapter. Side A uses an internal cross-section of 220x90 mm (rectangular), whereas side B is 180x95 mm (rectangular). Both side A and side B sleeves share the same insertion length of 40 mm. The transition section between the two sides is 30 mm long, for an overall length of 110 mm (side A sleeve, transition and side B sleeve). Internal chamfers are added at the ends to make assembly and duct insertion easier.
Parameter Value Unit
side A internal width 220 mm
side A internal height 90 mm
sleeve length on side A 40 mm
side B internal width 180 mm
side B internal height 95 mm
sleeve length on side B 40 mm
thickness 3 mm
transition length 30 mm
Y offset 0 mm
Z offset 0 mm
end chamfers inside

Rectangular pipe adapter STL file 220x90 mm to 220x90 mm – transition: 30 mm (📦 #11933)

1 object(s) - format STL
Rectangular pipe adapter STL file 220x90 mm to 220x90 mm – transition: 30 mm
3D STL file for rectangular duct sleeve. Side A and side B share the same internal cross-section, 220x90 mm, with a rectangular profile. Both side A and side B sleeves share the same insertion length of 30 mm. Between the two sleeves, the transition section adds 30 mm, giving an overall length of 90 mm. The internal edges at the ends are chamfered to help guide the duct during insertion.
Parameter Value Unit
side A internal width 220 mm
side A internal height 90 mm
sleeve length on side A 30 mm
side B internal width 220 mm
side B internal height 90 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

Rectangular duct adapter STL 3D file 204x60 mm to 204x60 mm – transition: 100 mm (📦 #12489)

1 object(s) - format STL
Rectangular duct adapter STL 3D file 204x60 mm to 204x60 mm – transition: 100 mm
Rectangular vent adapter downloadable as STL 3D file. On both side A and side B, the internal cross-section is 204x60 mm, with a rectangular geometry. Both side A and side B sleeves share the same insertion length of 50 mm. The transition section runs for 100 mm and the overall length is 200 mm, sleeves included. Inner and outer edges at both ends are left unchamfered. Side B is offset by 30 mm along the Z axis relative to side A.
Parameter Value Unit
side A internal width 204 mm
side A internal height 60 mm
sleeve length on side A 50 mm
side B internal width 204 mm
side B internal height 60 mm
sleeve length on side B 50 mm
thickness 2 mm
transition length 100 mm
Y offset 0 mm
Z offset 30 mm
end chamfers none

Rectangular pipe adapter STL 3D file 60x60 mm to 80x80 mm – transition: 180 mm (📦 #3872)

1 object(s) - format STL
Rectangular pipe adapter STL 3D file 60x60 mm to 80x80 mm – transition: 180 mm
Rectangular conduit adapter exported as STL 3D file. The internal cross-section on side A is 60x60 mm (square), while side B is 80x80 mm (square). The sleeve insertion length is the same on both sides, 10 mm. The transition section between the two sides is 180 mm long, for an overall length of 200 mm (side A sleeve, transition and side B sleeve). The wall is thin, with a thickness of 1 mm. No chamfers are applied at the ends; both inner and outer edges remain sharp.
Parameter Value Unit
side A internal width 60 mm
side A internal height 60 mm
sleeve length on side A 10 mm
side B internal width 80 mm
side B internal height 80 mm
sleeve length on side B 10 mm
thickness 1 mm
transition length 180 mm
Y offset 0 mm
Z offset 0 mm
end chamfers none

Rectangular duct adapter STL 3D file 196x146 mm to 180x104 mm – transition: 20 mm (📦 #9335)

1 object(s) - format STL
Rectangular duct adapter STL 3D file 196x146 mm to 180x104 mm – transition: 20 mm
Rectangular duct fitting exported as STL 3D file. The internal cross-section on side A is 196x146 mm (rectangular), while side B is 180x104 mm (rectangular). The insertion length on side A is 5 mm, while on side B it is 15 mm. The transition section runs for 20 mm and the overall length is 40 mm, sleeves included. No chamfers are applied at the ends; both inner and outer edges remain sharp.
Parameter Value Unit
side A internal width 196 mm
side A internal height 146 mm
sleeve length on side A 5 mm
side B internal width 180 mm
side B internal height 104 mm
sleeve length on side B 15 mm
thickness 2 mm
transition length 20 mm
Y offset 0 mm
Z offset 0 mm
end chamfers none