Quadrilateral
Quadrilateral by Openbook brings sculptural depth to the ceiling plane. Its slotted base panel and inserted baffles fold into a three-dimensional tongue-and-groove box, creating a rhythmic, geometric pattern that transforms a flat surface into a striking architectural feature.
Crafted from recycled polyester fiber, Quadrilateral delivers strong acoustic performance, reaching αw 0.80 (NRC 0.80) when installed with a 200 mm air chamber, making it well suited for offices, meeting rooms, and other spaces where clarity and comfort matter.
Available in 16 colors, from deep Anthracite Grey to warm Terracotta, it adapts easily to any interior palette. Installation is straightforward: the panel drops directly into a T24 grid, or can be fixed with adhesive or mechanical screws.
Total piece dimension 595x595x144 mm (base panel 595x595mm)
Gerecycled polyestervezel
Without chamber: ISO αw=0.25, ASTM NRC=0.30. With 200 mm chamber: ISO αw=0.80, ASTM NRC=0.80
For surface cleaning, spray an alcoholic solution (75%). In case of dust or lint, use a duster or vacuum cleaner. For heavy soiling, treat the material with hydrogen peroxide. Do not rub.
B-s1, d0
LEED Certificate (Pass/GOLD)
BREEAM Certificate (Exemplary level/GOLD)
Green Building Council USGBC
Antifungal Certificate
VOCs Certificate (A+ classification)
Acoustic Absorption Certification (Applus)
CE Certified (EN 15102:2007 + A1:2011)
Global Recycled Standard
OEKO-TEX Standard 100
Recycled Content Certification