The classic indoor finish
The classic Danish finish for technical insulation — a felt jacket innermost, taut canvas on the outside, and paste that binds it all together. A craft tradition from the 1900s that is still on the exam table and still found in basements, boiler rooms and older HVAC systems across the country.
Key figures
Application
Indoor plant rooms, basements, boiler rooms
Temperature limit
Up to ~120 °C surface
Fire class
Typically D-E (fire-retardant is better)
Water resistance
Poor — indoor use only
Typical brands
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