Custom Rectangle-to-rectangle duct adapter STL file 165x31.8 mm to 209x209 mm – transition: 150 mm 📦#12165

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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.
Generation date: 2026-09-30
3D Model Rectangle-to-rectangle duct adapter STL file 165x31.8 mm to 209x209 mm – transition: 150 mm

3D model download

Free
  • rectangular-to-rectangular-duc_model12165-nb0_dd{id}.stl : 1.3 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 165 mm (≃6 1/2 in)
#2 side A internal height 31.8 mm (≃1 1/4 in)
#3 sleeve length on side A 25.4 mm (1 in)
#4 side B internal width 209 mm (≃8.23 in)
#5 side B internal height 209 mm (≃8.23 in)
#6 sleeve length on side B 25.4 mm (1 in)
#7 thickness 3 mm (≃1/8 in)
#8 transition length 150 mm (≃5.91 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 171 mm (≃6.73 in)
external height on side A 37.8 mm (≃1 1/2 in)
external width on side B 215 mm (≃8.46 in)
external height on side B 215 mm (≃8.46 in)
total length 200.8 mm (≃7.91 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 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.
Parameter Value Unit
side A internal width 168 mm
side A internal height 32 mm
sleeve length on side A 20 mm
side B internal width 203 mm
side B internal height 203 mm
sleeve length on side B 20 mm
thickness 3 mm
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1 object(s) - format STL
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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
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Rectangular duct adapter STL file 190x100 mm to 186.7x96.7 mm – transition: 190 mm (📦 #12015)

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Rectangular duct adapter STL file 190x100 mm to 186.7x96.7 mm – transition: 190 mm
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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
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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
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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
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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
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Parameter Value Unit
side A internal width 220 mm
side A internal height 73 mm
sleeve length on side A 50 mm
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thickness 3 mm
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Parameter Value Unit
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side A internal height 203 mm
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Parameter Value Unit
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side A internal height 203.2 mm
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side B internal width 203.2 mm
side B internal height 203.2 mm
sleeve length on side B 30 mm
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Parameter Value Unit
side A internal width 150 mm
side A internal height 150 mm
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Parameter Value Unit
side A internal width 220 mm
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side B internal height 95 mm
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Parameter Value Unit
side A internal width 171 mm
side A internal height 108 mm
sleeve length on side A 5 mm
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sleeve length on side B 5 mm
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1 object(s) - format STL
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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
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Z offset 0 mm
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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
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1 object(s) - format STL
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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

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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
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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

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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 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

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1 object(s) - format STL
Rectangular pipe adapter STL 3D file 203x203 mm to 203x203 mm – transition: 55 mm
Rectangular pipe adapter downloadable as STL 3D file. Both ends have the same internal cross-section, 203x203 mm, with a square shape. The sleeve on side A provides an insertion length of 10 mm, and the sleeve on side B 60 mm. Between the two sleeves, the transition section adds 55 mm, giving an overall length of 125 mm. 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 10 mm
side B internal width 203 mm
side B internal height 203 mm
sleeve length on side B 60 mm
thickness 3 mm
transition length 55 mm
Y offset 0 mm
Z offset 0 mm
end chamfers none