Abstract: A machine for forming mineral fibers into mats or blankets comprising a plurality of modules each including primary fiber formers, fiber attenuation means, binder applicators, and fiber collectors to produce continuous lengths of mat. A common conveyor is adapted to receive the mats of each module at spaced mat receiving stations along its length. The common conveyor receives the uncured mats in juxtaposition to each other and conveys them to stations for further processing. Each module is adapted to operate and be taken off or put on line without disruption of the operation of the other modules. Each includes a scrap conveyor for primary fibers, a fiber collection conveyor cleaning means for the conveyor and a suction box all of which are shielded from the common conveyor to avoid contamination of the mat on the common conveyor.