3D Smoke Out This material is part of a ceiling system made of textile. It’s 3D knitted fabric (trevira CS) with open square cells gives it the masking effect. It has traversing holes, joined to form tubular cavity openings. The ceiling is made of two superposed folds, identical, each making a rectangle-patterned opening. The upper fold is connected with the bottom fold with a multi-ply thread curtain, for a masking effect in any direction. Smoke is still enabled to escape and firesprinklers can still reach their desired range.