An installation (1) for treating a mat of mineral fibers (10) moving in a plane and a direction of travel (X), by detection and elimination of localized defects (M), comprises: - a first transport member (2), - a second transport member (3) arranged after the first transport member in the direction of travel (X) and separated from the latter in said direction by a treatment zone (4), - a device (5) for detecting defects located in the mineral fiber mat (10), upstream of the treatment zone in the direction of travel (X), and - in the treatment zone (4), a device (6 ) Defect elimination adapted to eliminate online a defect (M) detected by the detection device (5) by eliminating the part of the mattress containing it.
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