3D preview of 4 inch Blast Gate
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4 inch Blast Gate

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Bounding box
128.0 × 245.0 × 72.5 mm
Engine
Precision B-rep
Parameters
15
Published
September 23, 2026

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The prompt

i want to design a blast gate for a 4" air duct

Parameters

NameValueRange
Duct Bore Diameter101.6 mm40 – 160
Collar Length30 mm10 – 80
Collar Wall Thickness3 mm1.5 – 8
Body Width128 mm80 – 240
Body Height170 mm110 – 260
Plate Thickness4 mm2 – 10
Blade Slot Gap4.5 mm2 – 12
Side Rail Width8 mm4 – 20
Bottom Rail Height8 mm4 – 20
Duct Bore Center Height63 mm35 – 150
Blade Thickness3 mm1 – 8
Blade Edge Height (open amount)45 mm10 – 150
Blade Length200 mm120 – 320
Grip Hole Diameter14 mm5 – 30
Grip Hole Offset From Blade Top20 mm8 – 60

Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.

4 inch Blast Gate - Free CAD Model (STEP, STL) | TextoCAD