Blackout Curtains are made made with fire-retardant material that passes the NFPA 701 Small Scale Fire Test, one of the most rigid in the fabric industry. We are happy to provide a flameproof certificate upon request. Blackout Curtains have stainless steel grommets spaced 6” apart. Side seams and bottom seams are 1” double, with center seams also double sewn. Blackout curtains are made 15% wider than the track size to allow for full coverage.