We arrived in Greensboro for a dryer vent cleaning but found a dangerous situation in the crawlspace.  The existing run was mostly plastic venting which caused a serious lint blockage.  This plastic venting is not fire resistant and should never be used for dryer exhaust.  We removed the existing vent and replaced it with rigid piping.  We sealed up the pipe with a high-temperature mastic tape and secured with metal straps.  The new system is much more efficient and the customer will see noticeable savings on her energy bill.