A.Corresponding editor Paul Fisette responds: In Massachusetts, where I live, the code won’t allow use of the plastic flex pipe if the pipe passes through a wall, and code officials discourage its use in all cases. Also, several dryer manufacturers have disallowed it because it can’t stand up to the hot air coming from the dryer.

From a mechanical perspective, it’s a poor idea. First, the spiral configuration of the flex pipe creates a lot of friction in the line, slowing the exhaust. Also, the sags and turns typical with flexible pipe further reduce air flow, and allow lint and moisture to accumulate, creating blockages.

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