| 摘要 |
A simplified installation construction for a venting device which requires from a select one of several sizes of an input diameter a correlation to a matching diameter of a flexible conduit, the simplification resulting from using an interconnection of the diameters which once made, is difficult to disconnect but is known not to require a disconnecting mode, and wherein the sizes of input diameters not used are merely discarded. This is a noteworthy alternative to attempting to correlate the diameter of a flexible conduit to all input diameter sizes of the venting device.
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