Not required., 422GT - drop seal., 1009 - batwing seal., PVC encased intumescent strip, plain - 15 x 4 to frame., PVC encased intumescent strip, fin - 15 x 4 to frame., PVC encased intumescent strip, brushed - 15 x 4 to frame., PVC encased intumescent strip, plain - 15 x 4 to meeting style of pairs., PVC encased intumescent strip, fin - 15 x 4 to meeting style of pairs., PVC encased intumescent strip, brushed - 15 x 4 to meeting style of pairs., 422 - drop seal.