CLAD
FAB
Site Measure
Menu
✕
Browse
Site Measure
Worker app
Fabrication
About
Account
Log in
Create account
Talk to us
WhatsApp
+353 (0) 87 212 6144
Get a quote
☰
Back
Home
Change of size (duct)
Transitions
Tweak Options
Active Defaults:
Aluminium 0.8mm • Overlap (lap) 25mm • Clearance (gap) 25mm
Adjust
👁️ Show Diagram
Just a plain duct reducer — no straight bits, shifts or special shapes?
Duct reducer — gets smaller →
Common sizes — big end ▾
Sizes in cm
10 × 10 cm
15 × 10 cm
15 × 15 cm
20 × 10 cm
20 × 15 cm
20 × 20 cm
25 × 10 cm
25 × 15 cm
25 × 20 cm
25 × 25 cm
30 × 10 cm
30 × 15 cm
30 × 20 cm
30 × 25 cm
30 × 30 cm
35 × 10 cm
35 × 15 cm
35 × 20 cm
35 × 25 cm
35 × 30 cm
35 × 35 cm
40 × 10 cm
40 × 15 cm
40 × 20 cm
40 × 25 cm
40 × 30 cm
40 × 35 cm
40 × 40 cm
45 × 10 cm
45 × 15 cm
45 × 20 cm
45 × 25 cm
45 × 30 cm
45 × 35 cm
45 × 40 cm
45 × 45 cm
50 × 10 cm
50 × 15 cm
50 × 20 cm
50 × 25 cm
50 × 30 cm
50 × 35 cm
50 × 40 cm
50 × 45 cm
50 × 50 cm
60 × 10 cm
60 × 15 cm
60 × 20 cm
60 × 25 cm
60 × 30 cm
60 × 35 cm
60 × 40 cm
60 × 45 cm
60 × 50 cm
60 × 60 cm
70 × 10 cm
70 × 15 cm
70 × 20 cm
70 × 25 cm
70 × 30 cm
70 × 35 cm
70 × 40 cm
70 × 45 cm
70 × 50 cm
70 × 60 cm
70 × 70 cm
80 × 10 cm
80 × 15 cm
80 × 20 cm
80 × 25 cm
80 × 30 cm
80 × 35 cm
80 × 40 cm
80 × 45 cm
80 × 50 cm
80 × 60 cm
80 × 70 cm
80 × 80 cm
90 × 10 cm
90 × 15 cm
90 × 20 cm
90 × 25 cm
90 × 30 cm
90 × 35 cm
90 × 40 cm
90 × 45 cm
90 × 50 cm
90 × 60 cm
90 × 70 cm
90 × 80 cm
90 × 90 cm
100 × 10 cm
100 × 15 cm
100 × 20 cm
100 × 25 cm
100 × 30 cm
100 × 35 cm
100 × 40 cm
100 × 45 cm
100 × 50 cm
100 × 60 cm
100 × 70 cm
100 × 80 cm
100 × 90 cm
100 × 100 cm
Common sizes — small end ▾
Sizes in cm
10 × 10 cm
15 × 10 cm
15 × 15 cm
20 × 10 cm
20 × 15 cm
20 × 20 cm
25 × 10 cm
25 × 15 cm
25 × 20 cm
25 × 25 cm
30 × 10 cm
30 × 15 cm
30 × 20 cm
30 × 25 cm
30 × 30 cm
35 × 10 cm
35 × 15 cm
35 × 20 cm
35 × 25 cm
35 × 30 cm
35 × 35 cm
40 × 10 cm
40 × 15 cm
40 × 20 cm
40 × 25 cm
40 × 30 cm
40 × 35 cm
40 × 40 cm
45 × 10 cm
45 × 15 cm
45 × 20 cm
45 × 25 cm
45 × 30 cm
45 × 35 cm
45 × 40 cm
45 × 45 cm
50 × 10 cm
50 × 15 cm
50 × 20 cm
50 × 25 cm
50 × 30 cm
50 × 35 cm
50 × 40 cm
50 × 45 cm
50 × 50 cm
60 × 10 cm
60 × 15 cm
60 × 20 cm
60 × 25 cm
60 × 30 cm
60 × 35 cm
60 × 40 cm
60 × 45 cm
60 × 50 cm
60 × 60 cm
70 × 10 cm
70 × 15 cm
70 × 20 cm
70 × 25 cm
70 × 30 cm
70 × 35 cm
70 × 40 cm
70 × 45 cm
70 × 50 cm
70 × 60 cm
70 × 70 cm
80 × 10 cm
80 × 15 cm
80 × 20 cm
80 × 25 cm
80 × 30 cm
80 × 35 cm
80 × 40 cm
80 × 45 cm
80 × 50 cm
80 × 60 cm
80 × 70 cm
80 × 80 cm
90 × 10 cm
90 × 15 cm
90 × 20 cm
90 × 25 cm
90 × 30 cm
90 × 35 cm
90 × 40 cm
90 × 45 cm
90 × 50 cm
90 × 60 cm
90 × 70 cm
90 × 80 cm
90 × 90 cm
100 × 10 cm
100 × 15 cm
100 × 20 cm
100 × 25 cm
100 × 30 cm
100 × 35 cm
100 × 40 cm
100 × 45 cm
100 × 50 cm
100 × 60 cm
100 × 70 cm
100 × 80 cm
100 × 90 cm
100 × 100 cm
2D Sketch
3D View
concentric transition — plan view
W1
H1
W2
H2
Taper length (L)
inlet — large opening
outlet — small opening
Concentric
Flat Face
Offset (Same)
Double Offset
Aspect Change
Vertical Riser
Big end — width (W1)
Tap
Big end — height (H1)
Tap
Small end — width (W2)
Tap
Small end — height (H2)
Tap
Taper length (L)
Tap
Straight bit at big end (h)
Tap
Straight bit at small end (m)
Tap
Active Parameter
Big end — width (W1)
---
The WIDTH of the BIG end — across the flat face, outside to outside.
⚠️ Missing values for: Big end — width, Big end — height + 5 more
Auto Insulation
Calculate
Big end — width (W1)
0 cm
Measure in
mm
cm
1
2
3
4
5
6
7
8
9
C
0
.
⌫
NEXT
WhatsApp