Rectangular-to-rectangular duct adapter 3D models

First model: 2025-11-25

Number of 3D models generated: 166

Category: technical parts

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Photos of various 3D printed models

This template generates rectangular-to-rectangular duct adapters. For each side, the length, height, and sleeve depth of the connector can be adjusted.

To fit a wide range of setups, the length of the transition between both sleeves is also adjustable, as well as the shell thickness and the optional chamfer at the ends to ease insertion.

Finally, you can apply an offset along the Y and Z axes.

Keywords: rectangular duct adapter, rectangular sleeve, rectangular duct sleeve, rectangular fitting, rectangular duct fitting

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	name	unit	Value	Weight
#1	side A internal width 20 to 300 – up to 1 decimal place	mm
#2	side A internal height 20 to 300 – up to 1 decimal place	mm
#3	sleeve length on side A 5 to 100 – up to 1 decimal place	mm
#4	side B internal width 20 to 300 – up to 1 decimal place	mm
#5	side B internal height 20 to 300 – up to 1 decimal place	mm
#6	sleeve length on side B 5 to 100 – up to 1 decimal place	mm
#7	thickness 1 to 8 - integer	mm
#8	transition length 20 to 300 – up to 1 decimal place	mm
#9	Y offset 0 to 300 – up to 1 decimal place	mm
#10	Z offset 0 to 300 – up to 1 decimal place	mm
#11	end chamfers		-	-
			Search

Illustration of the parameters

The latest online-generated models

Rectangle-to-rectangle duct adapter STL 3D file 39.5x29 mm to 39.5x29 mm – transition: 20 mm (📦 #11394)

1 object(s) - format STL

Rectangular vent adapter downloadable as STL 3D file. On both side A and side B, the internal cross-section is 39.5x29 mm, with a rectangular geometry. The sleeve on side A provides an insertion length of 15 mm, and the sleeve on side B 10 mm. The transition section between the two sides is 20 mm long, for an overall length of 45 mm (side A sleeve, transition and side B sleeve). The shell is very thick, with 6 mm wall thickness. Internal chamfers are added at the ends to make assembly and duct insertion easier.

Parameter	Value	Unit
side A internal width	39.5	mm
side A internal height	29	mm
sleeve length on side A	15	mm
side B internal width	39.5	mm
side B internal height	29	mm
sleeve length on side B	10	mm
thickness	6	mm
transition length	20	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	inside

Rectangular tube adapter STL file 110x55 mm to 110x55 mm – transition: 20 mm (📦 #11361)

1 object(s) - format STL

Rectangular duct adapter exported as STL 3D file. Both ends have the same internal cross-section, 110x55 mm, with a rectangular shape. The sleeve on side A provides an insertion length of 30 mm, and the sleeve on side B 50 mm. The transition section between the two sides is 20 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	110	mm
side A internal height	55	mm
sleeve length on side A	30	mm
side B internal width	110	mm
side B internal height	55	mm
sleeve length on side B	50	mm
thickness	2	mm
transition length	20	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	inside

Rectangular duct adapter STL file 110x55 mm to 110x55 mm – transition: 20 mm (📦 #11360)

1 object(s) - format STL

Rectangular adapter exported as STL 3D file. On both side A and side B, the internal cross-section is 110x55 mm, with a rectangular geometry. The sleeve on side A provides an insertion length of 100 mm, and the sleeve on side B 50 mm. The transition section runs for 20 mm and the overall length is 170 mm, sleeves included. Internal chamfers are added at the ends to make assembly and duct insertion easier.

Parameter	Value	Unit
side A internal width	110	mm
side A internal height	55	mm
sleeve length on side A	100	mm
side B internal width	110	mm
side B internal height	55	mm
sleeve length on side B	50	mm
thickness	2	mm
transition length	20	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	inside

Rectangular pipe adapter STL 3D file 130x130 mm to 130x130 mm – transition: 20 mm (📦 #11203)

1 object(s) - format STL

Rectangular adapter exported as STL 3D file. Both ends have the same internal cross-section, 130x130 mm, with a square shape. Each sleeve provides an insertion length of 82 mm. Between the two sleeves, the transition section adds 20 mm, giving an overall length of 184 mm. The ends are left without chamfers, with sharp inner and outer edges.

Parameter	Value	Unit
side A internal width	130	mm
side A internal height	130	mm
sleeve length on side A	82	mm
side B internal width	130	mm
side B internal height	130	mm
sleeve length on side B	82	mm
thickness	2	mm
transition length	20	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	none

Rectangular duct adapter STL file 300x300 mm to 300x300 mm – transition: 20 mm (📦 #11001)

1 object(s) - format STL

3D STL file for rectangular pipe adapter. Both ends have the same internal cross-section, 300x300 mm, with a square shape. Both side A and side B sleeves share the same insertion length of 65 mm. The transition section between the two sides is 20 mm long, for an overall length of 150 mm (side A sleeve, transition and side B sleeve). The wall is relatively thick, at 5 mm. The ends are left without chamfers, with sharp inner and outer edges.

Parameter	Value	Unit
side A internal width	300	mm
side A internal height	300	mm
sleeve length on side A	65	mm
side B internal width	300	mm
side B internal height	300	mm
sleeve length on side B	65	mm
thickness	5	mm
transition length	20	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	none

Rectangular duct adapter STL 3D file 300x300 mm to 300x300 mm – transition: 50 mm (📦 #10957)

1 object(s) - format STL

Rectangular duct adapter provided as 3D STL file. Both ends have the same internal cross-section, 300x300 mm, with a square shape. Each sleeve provides an insertion length of 50 mm. The transition section between the two sides is 50 mm long, for an overall length of 150 mm (side A sleeve, transition and side B sleeve). The wall is particularly robust, with 8 mm of material. Internal chamfers at the ends improve assembly and provide a smoother insertion of the mating duct.

Parameter	Value	Unit
side A internal width	300	mm
side A internal height	300	mm
sleeve length on side A	50	mm
side B internal width	300	mm
side B internal height	300	mm
sleeve length on side B	50	mm
thickness	8	mm
transition length	50	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	inside

Rectangular pipe adapter STL file 94x194 mm to 60x204 mm – transition: 40 mm (📦 #10940)

1 object(s) - format STL

Rectangular vent adapter provided as 3D STL file. Side A offers an internal cross-section of 94x194 mm (rectangular) and side B uses 60x204 mm (rectangular). Each sleeve provides an insertion length of 30 mm. Between the two sleeves, the transition section adds 40 mm, giving an overall length of 100 mm. Inner and outer edges at both ends are left unchamfered. An offset of 20 mm along the Y axis and 20 mm along the Z axis is applied to side B with respect to side A.

Parameter	Value	Unit
side A internal width	94	mm
side A internal height	194	mm
sleeve length on side A	30	mm
side B internal width	60	mm
side B internal height	204	mm
sleeve length on side B	30	mm
thickness	3	mm
transition length	40	mm
Y offset	20	mm
Z offset	20	mm
end chamfers	none

Rectangular duct adapter STL file 300x145 mm to 300x145 mm – transition: 85 mm (📦 #10917)

1 object(s) - format STL

3D STL file for rectangular adapter. Side A and side B share the same internal cross-section, 300x145 mm, with a rectangular profile. The sleeve insertion length is the same on both sides, 85 mm. The transition section between the two sides is 85 mm long, for an overall length of 255 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	300	mm
side A internal height	145	mm
sleeve length on side A	85	mm
side B internal width	300	mm
side B internal height	145	mm
sleeve length on side B	85	mm
thickness	2	mm
transition length	85	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	inside

Rectangular duct adapter STL file 40x26 mm to 36x27 mm – transition: 20 mm (📦 #10895)

1 object(s) - format STL

3D STL file for rectangular pipe adapter. The internal cross-section on side A is 40x26 mm (rectangular), while side B is 36x27 mm (rectangular). Each sleeve provides an insertion length of 10 mm. Between the two sleeves, the transition section adds 20 mm, giving an overall length of 40 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	40	mm
side A internal height	26	mm
sleeve length on side A	10	mm
side B internal width	36	mm
side B internal height	27	mm
sleeve length on side B	10	mm
thickness	2	mm
transition length	20	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	outside

Rectangular duct adapter STL file 42x28 mm to 35x28 mm – transition: 20 mm (📦 #10894)

1 object(s) - format STL

Rectangular duct sleeve exported as STL 3D file. Side A uses an internal cross-section of 42x28 mm (rectangular), whereas side B is 35x28 mm (rectangular). Both side A and side B sleeves share the same insertion length of 10 mm. Between the two sleeves, the transition section adds 20 mm, giving an overall length of 40 mm. Internal chamfers at the ends improve assembly and provide a smoother insertion of the mating duct.

Parameter	Value	Unit
side A internal width	42	mm
side A internal height	28	mm
sleeve length on side A	10	mm
side B internal width	35	mm
side B internal height	28	mm
sleeve length on side B	10	mm
thickness	2	mm
transition length	20	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

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 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 tube adapter STL 3D file 100x200 mm to 60x204 mm – transition: 40 mm (📦 #10511)

1 object(s) - format STL

Rectangular duct transition provided as 3D STL file. Side A uses an internal cross-section of 100x200 mm (rectangular), whereas side B is 60x204 mm (rectangular). Both side A and side B sleeves share the same insertion length of 30 mm. Between the two sleeves, the transition section adds 40 mm, giving an overall length of 100 mm. No chamfers are applied at the ends; both inner and outer edges remain sharp. Relative to side A, side B is shifted by 20 mm along the Y axis and 20 mm along the Z axis.

Parameter	Value	Unit
side A internal width	100	mm
side A internal height	200	mm
sleeve length on side A	30	mm
side B internal width	60	mm
side B internal height	204	mm
sleeve length on side B	30	mm
thickness	3	mm
transition length	40	mm
Y offset	20	mm
Z offset	20	mm
end chamfers	none

Rectangular tube adapter STL file 100x200 mm to 60x204 mm – transition: 170 mm (📦 #10508)

1 object(s) - format STL

Rectangular duct transition provided as 3D STL file. The internal cross-section on side A is 100x200 mm (rectangular), while side B is 60x204 mm (rectangular). The sleeve insertion length is the same on both sides, 40 mm. Between the two sleeves, the transition section adds 170 mm, giving an overall length of 250 mm. Inner and outer edges at both ends are left unchamfered. Side B is offset by 20 mm along the Y axis and 85 mm along the Z axis relative to side A.

Parameter	Value	Unit
side A internal width	100	mm
side A internal height	200	mm
sleeve length on side A	40	mm
side B internal width	60	mm
side B internal height	204	mm
sleeve length on side B	40	mm
thickness	3	mm
transition length	170	mm
Y offset	20	mm
Z offset	85	mm
end chamfers	none

Rectangular tube adapter STL 3D file 76x76 mm to 76x76 mm – transition: 20 mm (📦 #10333)

1 object(s) - format STL

Rectangular duct connector provided as 3D STL file. On both side A and side B, the internal cross-section is 76x76 mm, with a square geometry. Both side A and side B sleeves share the same insertion length of 5 mm. Between the two sleeves, the transition section adds 20 mm, giving an overall length of 30 mm. No chamfers are applied at the ends; both inner and outer edges remain sharp.

Parameter	Value	Unit
side A internal width	76	mm
side A internal height	76	mm
sleeve length on side A	5	mm
side B internal width	76	mm
side B internal height	76	mm
sleeve length on side B	5	mm
thickness	2	mm
transition length	20	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	none

Rectangular pipe adapter STL 3D file 76x76 mm to 76x76 mm – transition: 20 mm (📦 #10332)

1 object(s) - format STL

Rectangular tube adapter exported as STL 3D file. On both side A and side B, the internal cross-section is 76x76 mm, with a square geometry. On side A, the sleeve length is 5 mm, and on side B it is 50 mm. The transition section between the two sides is 20 mm long, for an overall length of 75 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	76	mm
side A internal height	76	mm
sleeve length on side A	5	mm
side B internal width	76	mm
side B internal height	76	mm
sleeve length on side B	50	mm
thickness	2	mm
transition length	20	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	none

Rectangle-to-rectangle duct adapter STL 3D file 164.2x68 mm to 164x67.8 mm – transition: 20 mm (📦 #10260)

1 object(s) - format STL

Rectangular duct adapter provided as 3D STL file. Side A offers an internal cross-section of 164.2x68 mm (rectangular) and side B uses 164x67.8 mm (rectangular). On side A, the sleeve length is 80 mm, and on side B it is 100 mm. The transition section between the two sides is 20 mm long, for an overall length of 200 mm (side A sleeve, transition and side B sleeve). The shell is kept very light, with only 1 mm wall thickness. The internal edges at the ends are chamfered to help guide the duct during insertion.

Parameter	Value	Unit
side A internal width	164.2	mm
side A internal height	68	mm
sleeve length on side A	80	mm
side B internal width	164	mm
side B internal height	67.8	mm
sleeve length on side B	100	mm
thickness	1	mm
transition length	20	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	inside

Rectangular tube adapter STL 3D file 214x87 mm to 215x87 mm – transition: 20 mm (📦 #10241)

1 object(s) - format STL

Rectangular pipe adapter provided as 3D STL file. Side A offers an internal cross-section of 214x87 mm (rectangular) and side B uses 215x87 mm (rectangular). Each sleeve provides an insertion length of 5 mm. Between the two sleeves, the transition section adds 20 mm, giving an overall length of 30 mm. Internal chamfers at the ends improve assembly and provide a smoother insertion of the mating duct.

Parameter	Value	Unit
side A internal width	214	mm
side A internal height	87	mm
sleeve length on side A	5	mm
side B internal width	215	mm
side B internal height	87	mm
sleeve length on side B	5	mm
thickness	3	mm
transition length	20	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	inside

Rectangular duct adapter STL 3D file 214x85 mm to 215x85 mm – transition: 20 mm (📦 #10239)

1 object(s) - format STL

Rectangular vent adapter exported as STL 3D file. Side A offers an internal cross-section of 214x85 mm (rectangular) and side B uses 215x85 mm (rectangular). The sleeve insertion length is the same on both sides, 5 mm. Between the two sleeves, the transition section adds 20 mm, giving an overall length of 30 mm. The internal edges at the ends are chamfered to help guide the duct during insertion.

Parameter	Value	Unit
side A internal width	214	mm
side A internal height	85	mm
sleeve length on side A	5	mm
side B internal width	215	mm
side B internal height	85	mm
sleeve length on side B	5	mm
thickness	3	mm
transition length	20	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	inside

Rectangular tube adapter STL 3D file 214x83 mm to 215x83 mm – transition: 20 mm (📦 #10238)

1 object(s) - format STL

Rectangular adapter downloadable as STL 3D file. The internal cross-section on side A is 214x83 mm (rectangular), while side B is 215x83 mm (rectangular). Both side A and side B sleeves share the same insertion length of 5 mm. Between the two sleeves, the transition section adds 20 mm, giving an overall length of 30 mm. External chamfers at the ends help the adapter slide and seat more easily in the duct system.

Parameter	Value	Unit
side A internal width	214	mm
side A internal height	83	mm
sleeve length on side A	5	mm
side B internal width	215	mm
side B internal height	83	mm
sleeve length on side B	5	mm
thickness	3	mm
transition length	20	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	outside

Rectangular pipe adapter STL file 215x90 mm to 215x90 mm – transition: 20 mm (📦 #10237)

1 object(s) - format STL

Rectangular adapter provided as 3D STL file. On both side A and side B, the internal cross-section is 215x90 mm, with a rectangular geometry. The sleeve insertion length is the same on both sides, 5 mm. The transition section between the two sides is 20 mm long, for an overall length of 30 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	215	mm
side A internal height	90	mm
sleeve length on side A	5	mm
side B internal width	215	mm
side B internal height	90	mm
sleeve length on side B	5	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 file 220x90 mm to 220x55 mm – transition: 20 mm (📦 #10018)

1 object(s) - format STL

Rectangular duct adapter downloadable as STL 3D file. Side A uses an internal cross-section of 220x90 mm (rectangular), whereas side B is 220x55 mm (rectangular). The sleeve insertion length is the same on both sides, 30 mm. The transition section runs for 20 mm and the overall length is 80 mm, sleeves included. The shell is thick, with a wall thickness of 5 mm. 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	30	mm
side B internal width	220	mm
side B internal height	55	mm
sleeve length on side B	30	mm
thickness	5	mm
transition length	20	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	inside

Rectangle-to-rectangle duct adapter STL 3D file 111.4x54.4 mm to 110.4x54.4 mm – transition: 20 mm (📦 #9918)

1 object(s) - format STL

Rectangular adapter exported as STL 3D file. Side A uses an internal cross-section of 111.4x54.4 mm (rectangular), whereas side B is 110.4x54.4 mm (rectangular). Both side A and side B sleeves share the same insertion length of 25 mm. The transition section runs for 20 mm and the overall length is 70 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	111.4	mm
side A internal height	54.4	mm
sleeve length on side A	25	mm
side B internal width	110.4	mm
side B internal height	54.4	mm
sleeve length on side B	25	mm
thickness	2	mm
transition length	20	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	inside

Rectangle-to-rectangle duct adapter STL file 70x70 mm to 37x36 mm – transition: 20 mm (📦 #9719)

1 object(s) - format STL

Rectangular tube adapter exported as STL 3D file. Side A uses an internal cross-section of 70x70 mm (square), whereas side B is 37x36 mm (rectangular). On side A, the sleeve length is 40 mm, and on side B it is 5 mm. The transition section runs for 20 mm and the overall length is 65 mm, sleeves included. Wall thickness is minimal at 1 mm. The ends are left without chamfers, with sharp inner and outer edges.

Parameter	Value	Unit
side A internal width	70	mm
side A internal height	70	mm
sleeve length on side A	40	mm
side B internal width	37	mm
side B internal height	36	mm
sleeve length on side B	5	mm
thickness	1	mm
transition length	20	mm
Y offset	0	mm
Z offset	0	mm
end chamfers	none

Rectangle-to-rectangle duct adapter STL 3D file 214x84 mm to 198x54 mm – transition: 40 mm (📦 #9718)

1 object(s) - format STL

Rectangular adapter provided as 3D STL file. Side A uses an internal cross-section of 214x84 mm (rectangular), whereas side B is 198x54 mm (rectangular). On side A, the sleeve length is 30 mm, and on side B it is 40 mm. Between the two sleeves, the transition section adds 40 mm, giving an overall length of 110 mm. The outer edges at the ends are chamfered, which simplifies inserting the adapter into the mating duct. An offset of 16 mm along the Z axis is applied to side B with respect to side A.

Parameter	Value	Unit
side A internal width	214	mm
side A internal height	84	mm
sleeve length on side A	30	mm
side B internal width	198	mm
side B internal height	54	mm
sleeve length on side B	40	mm
thickness	3	mm
transition length	40	mm
Y offset	0	mm
Z offset	16	mm
end chamfers	outside

Rectangle-to-rectangle duct adapter STL file 220x90 mm to 205x60 mm – transition: 50 mm (📦 #9709)

1 object(s) - format STL

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
end chamfers	inside

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

1 object(s) - format STL

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 file 60x284.4 mm to 161.9x191 mm – transition: 50 mm (📦 #9631)

1 object(s) - format STL

Rectangular vent adapter exported as STL 3D file. The internal cross-section on side A is 60x284.4 mm (rectangular), while side B is 161.9x191 mm (rectangular). The insertion length on side A is 5 mm, while on side B it is 33.5 mm. The transition section between the two sides is 50 mm long, for an overall length of 88.5 mm (side A sleeve, transition and side B sleeve). The shell is thick, with a wall thickness of 4 mm. The internal edges at the ends are chamfered to help guide the duct during insertion. Relative to side A, side B is shifted by 25 mm along the Y axis.

Parameter	Value	Unit
side A internal width	60	mm
side A internal height	284.4	mm
sleeve length on side A	5	mm
side B internal width	161.9	mm
side B internal height	191	mm
sleeve length on side B	33.5	mm
thickness	4	mm
transition length	50	mm
Y offset	25	mm
Z offset	0	mm
end chamfers	inside

Rectangular tube adapter STL 3D file 60x284.4 mm to 161.9x191 mm – transition: 50 mm (📦 #9620)

1 object(s) - format STL

3D STL file for rectangular conduit adapter. The internal cross-section on side A is 60x284.4 mm (rectangular), while side B is 161.9x191 mm (rectangular). On side A, the sleeve length is 5 mm, and on side B it is 33.5 mm. The transition section runs for 50 mm and the overall length is 88.5 mm, sleeves included. The shell is thick, with a wall thickness of 5 mm. The internal edges at the ends are chamfered to help guide the duct during insertion. Side B is offset by 25 mm along the Y axis relative to side A.

Parameter	Value	Unit
side A internal width	60	mm
side A internal height	284.4	mm
sleeve length on side A	5	mm
side B internal width	161.9	mm
side B internal height	191	mm
sleeve length on side B	33.5	mm
thickness	5	mm
transition length	50	mm
Y offset	25	mm
Z offset	0	mm
end chamfers	inside

Rectangular tube adapter STL file 60x284.4 mm to 161.9x191 mm – transition: 50 mm (📦 #9619)

1 object(s) - format STL

Rectangular pipe adapter provided as 3D STL file. Side A offers an internal cross-section of 60x284.4 mm (rectangular) and side B uses 161.9x191 mm (rectangular). Each sleeve provides an insertion length of 5 mm. The transition section runs for 50 mm and the overall length is 60 mm, sleeves included. The wall is relatively thick, at 5 mm. Internal chamfers are added at the ends to make assembly and duct insertion easier. An offset of 25 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	284.4	mm
sleeve length on side A	5	mm
side B internal width	161.9	mm
side B internal height	191	mm
sleeve length on side B	5	mm
thickness	5	mm
transition length	50	mm
Y offset	25	mm
Z offset	0	mm
end chamfers	inside

Use cases for Rectangle-to-Rectangle duct adapters

Rectangle-to-rectangle adapters make it possible to connect two ducts of similar shape but different dimensions while keeping a smooth, controlled transition. The parametric design lets you fine-tune the internal sections, sleeve lengths, wall thickness, and the transition length, ensuring a part that fits the installation requirements with precision.

For a significant size reduction, the adapter 200×90 mm to 80×80 mm shows how the template handles large differences between the two openings while maintaining a gentle transition and consistent structural strength. Conversely, for a simple and compact reduction, the model 90×90 mm to 80×80 mm offers a short, efficient geometry with no offset, ideal where space is limited.

When the ducts cannot be aligned on the same axis, the system can generate a shifted (offset) adapter. The model 60×60 mm with offset is a typical example, making installation easier in setups that require a mechanical offset. And for long, gradual transitions, the adapter 60×60 mm to 80×80 mm (180 mm transition) demonstrates how extended profiles help smooth airflow changes or bypass space constraints.