The PRODEC-SAN sanitary ceiling penetration seal for sealing off the sewer line ventilation and venting in PP drainage pipes above the last storey ceiling. The free cross-section ensures a low pressure loss.

It consists of a housing made of gypsum fiberboard with integrated pipe connection pieces. The multi-layer damper blade, which is held in the open position by a thermal release device, is located on the inside of the housing.

In the event of a fire, the thermal release device reacts and the damper blades close by means of spring force. The intumescent integrated in the damper blade then expands - the cross-section is closed and heat transfer to the side facing away from the fire is restricted.