
Made-to-measure rectangular ducts
Made-to-measure rectangular ducts and fittings in galvanised and stainless steel, with frame connections. Each type shows its versions and the dimensions to give us.
Key data
All dimensions in mm. Every piece is made to measure: send us the dimensions from the drawing, with the code if there is one.
- Dimensions
- Made to measure: you choose the cross-section A × B and the length.
- Material
- Galvanised steel (Z275), stainless steel 304 and stainless steel 316.
- Connection
- Frame connection: each piece has a 20 or 30 mm frame at its ends.
- Airtightness
- Airtightness class B, C or D to EN 1507.
Choose a product type
Each type has its own page with a dimension drawing for each version.

Straight rectangular ducts
Made-to-measure straight rectangular ducts with a frame at both ends. You choose the cross-section A × B and the length L.
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Rectangular bends
90° bends with an inner radius of 150 mm, with or without turning vanes. We also make special bends to measure, with another angle or a different size at each end.
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Rectangular offsets
An offset shifts the duct by a distance E, with the same or a different cross-section at each end.
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Transformation pieces
A transformation piece goes from a cross-section A × B to a smaller cross-section C × D, with a 50 mm straight section at both ends. The position of the small opening sets the type.
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Rectangular tees
Tees with a square branch (T, TRD) or an angled branch (T a). The square transitions are rounded with a 150 mm radius.
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Square-to-round transitions
Transitions from a rectangular duct A × B to a round duct Ø, concentric or eccentric.
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Rectangular take-offs
Take-offs A × B to connect a rectangular duct to an existing duct, square or with a 45° entry.
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Combined fittings
Two fittings in one piece: two bends side by side, a duct with a bend or a duct with an offset.
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Miscellaneous
Ducts and bends with a slanted outlet, and cowls with or without a grille.
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Rectangular silencers
Silencers with baffles of 100 or 200 mm thick. The number of baffles sets the width B; the height A ranges from 300 to 1800 mm.
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Sound-attenuating baffles
Separate sound-attenuating baffles of 100 or 200 mm thick, in lengths from 500 to 1500 mm.
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Separate frames, covers, grilles and flexible connections for rectangular ducts. We also fit take-offs and make cut-outs for you.
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We insulate rectangular ducts and fittings inside or outside with Armaflex, or outside with Rockwool with aluminium foil.
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