Custom Rectangular tube adapter STL file 210.9x210.9 mm to 168x31.7 mm – transition: 100 mm 📦#12163

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Rectangular duct adapter exported as STL 3D file. Side A uses an internal cross-section of 210.9x210.9 mm (square), whereas side B is 168x31.7 mm (rectangular). On side A, the sleeve length is 40 mm, and on side B it is 32 mm. The transition section runs for 100 mm and the overall length is 172 mm, sleeves included. The ends are left without chamfers, with sharp inner and outer edges.
Generation date: 2026-09-30
3D Model Rectangular tube adapter STL file 210.9x210.9 mm to 168x31.7 mm – transition: 100 mm

3D model download

Free
  • rectangular-to-rectangular-duc_model12163-nb0_dd{id}.stl : 1.5 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 210.9 mm (≃8 5/16 in)
#2 side A internal height 210.9 mm (≃8 5/16 in)
#3 sleeve length on side A 40 mm (≃1 9/16 in)
#4 side B internal width 168 mm (≃6 5/8 in)
#5 side B internal height 31.7 mm (≃1 1/4 in)
#6 sleeve length on side B 32 mm (≃1 1/4 in)
#7 thickness 3 mm (≃1/8 in)
#8 transition length 100 mm (≃3 15/16 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 216.9 mm (≃8.54 in)
external height on side A 216.9 mm (≃8.54 in)
external width on side B 174 mm (≃6.85 in)
external height on side B 37.7 mm (≃1.48 in)
total length 172 mm (≃6.77 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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To search for a model based on your own parameters, go to the template page Rectangular-to-rectangular duct adapter 

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
end chamfers none

Rectangular tube adapter STL 3D file 220x90 mm to 205x60 mm – transition: 50 mm (📦 #9685)

1 object(s) - format STL
Rectangular tube adapter STL 3D file 220x90 mm to 205x60 mm – transition: 50 mm
Rectangular duct transition exported as STL 3D file. The internal cross-section on side A is 220x90 mm (rectangular), while side B is 205x60 mm (rectangular). Each sleeve provides an insertion length of 40 mm. The transition section between the two sides is 50 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.
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 205 mm
side B internal height 60 mm
sleeve length on side B 40 mm
thickness 3 mm
transition length 50 mm
Y offset 0 mm
Z offset 0 mm
end chamfers inside

Rectangle-to-rectangle duct adapter STL 3D file 200x200 mm to 56x56 mm – transition: 40 mm (📦 #5821)

1 object(s) - format STL
Rectangle-to-rectangle duct adapter STL 3D file 200x200 mm to 56x56 mm – transition: 40 mm
3D STL file for rectangular tube adapter. Side A uses an internal cross-section of 200x200 mm (square), whereas side B is 56x56 mm (square). On side A, the sleeve length is 50 mm, and on side B it is 25 mm. The transition section runs for 40 mm and the overall length is 115 mm, sleeves included. Wall thickness is generous (4 mm). The internal edges at the ends are chamfered to help guide the duct during insertion.
Parameter Value Unit
side A internal width 200 mm
side A internal height 200 mm
sleeve length on side A 50 mm
side B internal width 56 mm
side B internal height 56 mm
sleeve length on side B 25 mm
thickness 4 mm
transition length 40 mm
Y offset 0 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 file 220x90 mm to 205x60 mm – transition: 50 mm (📦 #9709)

1 object(s) - format STL
Rectangle-to-rectangle duct adapter STL file 220x90 mm to 205x60 mm – transition: 50 mm
Rectangular duct connector provided as 3D STL file. Side A uses an internal cross-section of 220x90 mm (rectangular), whereas side B is 205x60 mm (rectangular). Both side A and side B sleeves share the same insertion length of 40 mm. Between the two sleeves, the transition section adds 50 mm, giving an overall length of 130 mm. Internal chamfers at the ends improve assembly and provide a smoother insertion of the mating duct. Side B is offset by 15 mm along the Z axis relative to side A.
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 205 mm
side B internal height 60 mm
sleeve length on side B 40 mm
thickness 3 mm
transition length 50 mm
Y offset 0 mm
Z offset 15 mm
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Rectangular pipe adapter STL file 182.4x92.8 mm to 182.4x32 mm – transition: 100 mm (📦 #4480)

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Rectangular pipe adapter STL file 182.4x92.8 mm to 182.4x32 mm – transition: 100 mm
Rectangular duct sleeve downloadable as STL 3D file. The internal cross-section on side A is 182.4x92.8 mm (rectangular), while side B is 182.4x32 mm (rectangular). The sleeve on side A provides an insertion length of 60 mm, and the sleeve on side B 30 mm. The transition section between the two sides is 100 mm long, for an overall length of 190 mm (side A sleeve, transition and side B sleeve). 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. Relative to side A, side B is shifted by 30.4 mm along the Z axis.
Parameter Value Unit
side A internal width 182.4 mm
side A internal height 92.8 mm
sleeve length on side A 60 mm
side B internal width 182.4 mm
side B internal height 32 mm
sleeve length on side B 30 mm
thickness 4 mm
transition length 100 mm
Y offset 0 mm
Z offset 30.4 mm
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Rectangular pipe adapter STL file 203x203 mm to 203x203 mm – transition: 85 mm (📦 #12222)

1 object(s) - format STL
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
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

Rectangular duct adapter STL 3D file 228x98 mm to 158x63 mm – transition: 20 mm (📦 #9464)

1 object(s) - format STL
Rectangular duct adapter STL 3D file 228x98 mm to 158x63 mm – transition: 20 mm
Rectangular pipe adapter exported as STL 3D file. Side A uses an internal cross-section of 228x98 mm (rectangular), whereas side B is 158x63 mm (rectangular). The sleeve on side A provides an insertion length of 20 mm, and the sleeve on side B 30 mm. The transition section between the two sides is 20 mm long, for an overall length of 70 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 228 mm
side A internal height 98 mm
sleeve length on side A 20 mm
side B internal width 158 mm
side B internal height 63 mm
sleeve length on side B 30 mm
thickness 3 mm
transition length 20 mm
Y offset 0 mm
Z offset 0 mm
end chamfers inside

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

Rectangle-to-rectangle duct adapter STL 3D file 182.4x92.8 mm to 182.4x32 mm – transition: 100 mm (📦 #4551)

1 object(s) - format STL
Rectangle-to-rectangle duct adapter STL 3D file 182.4x92.8 mm to 182.4x32 mm – transition: 100 mm
Rectangular duct connector downloadable as STL 3D file. Side A uses an internal cross-section of 182.4x92.8 mm (rectangular), whereas side B is 182.4x32 mm (rectangular). The sleeve on side A provides an insertion length of 60 mm, and the sleeve on side B 50 mm. The transition section runs for 100 mm and the overall length is 210 mm, sleeves included. Wall thickness is generous (4 mm). Inner and outer edges at both ends are left unchamfered. Side B is offset by 30.4 mm along the Z axis relative to side A.
Parameter Value Unit
side A internal width 182.4 mm
side A internal height 92.8 mm
sleeve length on side A 60 mm
side B internal width 182.4 mm
side B internal height 32 mm
sleeve length on side B 50 mm
thickness 4 mm
transition length 100 mm
Y offset 0 mm
Z offset 30.4 mm
end chamfers none

Rectangular tube adapter STL 3D file 150x150 mm to 55x55 mm – transition: 25 mm (📦 #5825)

1 object(s) - format STL
Rectangular tube adapter STL 3D file 150x150 mm to 55x55 mm – transition: 25 mm
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
Y offset 0 mm
Z offset 0 mm
end chamfers inside

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

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
Y offset 0 mm
Z offset 0 mm
end chamfers inside

Rectangle-to-rectangle duct adapter STL 3D file 112x112 mm to 112x56 mm – transition: 52 mm (📦 #12629)

1 object(s) - format STL
Rectangle-to-rectangle duct adapter STL 3D file 112x112 mm to 112x56 mm – transition: 52 mm
Rectangular duct fitting exported as STL 3D file. Side A offers an internal cross-section of 112x112 mm (square) and side B uses 112x56 mm (rectangular). The insertion length on side A is 25 mm, while on side B it is 30 mm. The transition section between the two sides is 52 mm long, for an overall length of 107 mm (side A sleeve, transition and side B sleeve). The ends are left without chamfers, with sharp inner and outer edges. Side B is offset by 26 mm along the Z axis relative to side A.
Parameter Value Unit
side A internal width 112 mm
side A internal height 112 mm
sleeve length on side A 25 mm
side B internal width 112 mm
side B internal height 56 mm
sleeve length on side B 30 mm
thickness 2 mm
transition length 52 mm
Y offset 0 mm
Z offset 26 mm
end chamfers none

Rectangular tube adapter STL 3D file 112x112 mm to 112x56 mm – transition: 52 mm (📦 #12627)

1 object(s) - format STL
Rectangular tube adapter STL 3D file 112x112 mm to 112x56 mm – transition: 52 mm
Rectangular duct connector exported as STL 3D file. The internal cross-section on side A is 112x112 mm (square), while side B is 112x56 mm (rectangular). Each sleeve provides an insertion length of 25 mm. Between the two sleeves, the transition section adds 52 mm, giving an overall length of 102 mm. The ends are left without chamfers, with sharp inner and outer edges. Side B is offset by 26 mm along the Z axis relative to side A.
Parameter Value Unit
side A internal width 112 mm
side A internal height 112 mm
sleeve length on side A 25 mm
side B internal width 112 mm
side B internal height 56 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 duct adapter STL file 203.2x203.2 mm to 203.2x203.2 mm – transition: 60 mm (📦 #12208)

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

Rectangular tube adapter STL file 120x120 mm to 100x55 mm – transition: 180 mm (📦 #4554)

1 object(s) - format STL
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
side B internal width 100 mm
side B internal height 55 mm
sleeve length on side B 10 mm
thickness 2 mm
transition length 180 mm
Y offset 0 mm
Z offset 0 mm
end chamfers none

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
end chamfers inside

Rectangle-to-rectangle duct adapter STL 3D file 200x150 mm to 180x100.4 mm – transition: 20 mm (📦 #9333)

1 object(s) - format STL
Rectangle-to-rectangle duct adapter STL 3D file 200x150 mm to 180x100.4 mm – transition: 20 mm
Rectangular duct fitting downloadable as STL 3D file. Side A uses an internal cross-section of 200x150 mm (rectangular), whereas side B is 180x100.4 mm (rectangular). The sleeve on side A provides an insertion length of 5 mm, and the sleeve on side B 20 mm. Between the two sleeves, the transition section adds 20 mm, giving an overall length of 45 mm. Internal chamfers are added at the ends to make assembly and duct insertion easier.
Parameter Value Unit
side A internal width 200 mm
side A internal height 150 mm
sleeve length on side A 5 mm
side B internal width 180 mm
side B internal height 100.4 mm
sleeve length on side B 20 mm
thickness 2 mm
transition length 20 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