Master Flow | sku: 3570357 Master Flow 16 in. x 35 in. Galvanized Panning Master Flow 16 in. x 35 in. Galvanized Panning is used to seal the underside of a joist space. This panning is constructed with sturdy 30-Gauge galvanized steel. It can be cut to size to suit a variety of applications.|Seals the underside of a joist... Log in for pricing