Three-layer bonded construction: foil jacket, glass wool core, foil inner liner for long service life.
Reflective aluminum foil surface resists moisture, corrosion and aging in humid ventilation environments.
Evenly distributed glass wool provides consistent thermal insulation and softens transmitted noise.
Helical steel wire frame holds a full round section, preserving airflow area and preventing flat spots.
Stable wool density resists settling and thinning, keeping insulation performance over time.
Foil layers slow damp penetration into the core, avoiding wet, matted insulation that loses effect.
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