Not sure of the problem either. I don't like lots of flex, especially straight off the unit. I've looked into this here. It's Ok if:
- combined snakes have sufficient CFM as to not choke the airflow
- if sleeve is metal not vinyl
- our Code has length limitations for snakes, vinyl and metal, especially in Res. Commercial code is different also

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Accurate Inspections & Consulting, Inc.
773/844-4AIC
Markus Keller