DuoVac silencer piping has melted?!?

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Old 10-09-19, 08:20 AM
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Question DuoVac silencer piping has melted?!?

Hello. I have a central DuoVac Vacuum cleaner in the basement. While going through seasonal dirt hopper maintenance, I noticed that the PVC piping linking the silencer to the unit has changed shape, the elbow is not longer round section (rather flattened) and the piping going inside the unit once made the silencer hold vertically, it has now changed geometry so the silencer is now diagonal. Any idea what the issue can be here? Is this something I can fix? Is this plastic fusion happening? Important fact, the "dirt" piping going into the unit is just fine, no deformities observed there. Thanks for your help.

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Last edited by PJmax; 10-09-19 at 01:33 PM. Reason: reoriented/resized picture
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Old 10-09-19, 01:36 PM
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Usually the discharge is sent outside...... yours is not ?

The exhaust line from a central vacuum runs very hot. Allowing the vacuum to sit there running
with the hose blocked will really cause the temperature to spike. It's not uncommon for the exhaust pipe and fittings to deform.
 
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Old 11-09-19, 11:47 AM
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Hi PJax and thank for the answer. Sorry the delay of my own answer. Indeed, the discharge just ends up in the basement, not outside. It is just an air exhaust (no dirt), right? The unit has been there for more than 10 years, so maybe it just requires an exhaust pipe change, I will try to open the unit and change the pipe section if at all possible. I'll have to cut pvc piping first and install some kind of union fitting because the guy who installed this left zero degrees of liberty whatsoever to allow me to pull the unit from the wall *fittings all glued *.
 
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Old 11-09-19, 01:01 PM
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It is just an air exhaust (no dirt), right?
There is fine dust that bypasses the filter. I'd highly recommend discharging it outside.

As the vacuum ages and the motor gets older..... it starts to run hotter.
Built-in vacuum pipe is very thin. It doesn't take much to melt it.
 
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