Closure cap for preventing reverse control of air flow in channel, has frame, fastening units for holding frame in channel and membrane which is connected with frame, where folding unit is provided to move membrane in direction of gas flow

摘要

The closure cap (1) has a frame, fastening units (3) for holding the frame in a channel (2) and a membrane (6) which is connected with the frame, where the folding unit (5) is provided to move the membrane in the direction of the gas flow for blocking the air flow, so that a past flow of the gas flow is enabled. The membrane is a textile area-measured material. The fastening unit has a holding axis fixed in the channel and the folding unit has a hinge with two pivotable membrane fastening sections that are supported to the holding axis.