- Trade name “Stainless steel chimney BTDW25”
- Type: multi-layer metal system flue system with 25 mm thermal insulation
- Material: inner tube 0.4 mm AISI 316L / outer tube 0.4 mm AISI 304
- Thermal insulation: 25 mm mineral wool
- Standard version N1 / vacuum operation without seal
- Installation length 190 to 390 mm
- Color: silver
- Brand: Bertrams
- Adjustment range: 25 – 45 mm

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