Central Vac silencer

Robert Green · 2009-08-15T07:24:29+00:00

I want to truly silence my Hayden central vac. I bought a muffler for it,but it's not really of much use since I've already vented the exhaust to theoutside via an unused dryer vent. The facts are that it's a high RPM motorand it whines and wakes people up when it's in use when someone's sleeping.My plan is to box it inside something lined with acoustical foam and toprovide two auxilliary fans (one low mounted push, one high mounted pull andthermal monitoring) to keep the motor cool and shut if off if thetemperature in the box gets too high. I know the motor's got a built inthermal shutoff, but since I am going to be running it in an abnormalenvironment and what a replacement costs, I'd feel safer with two.I am going to make some preliminary and crude sound measurements wrapping ina different material to see if any has particularly good sound deadeningproperties. Anything I am missing? What sort of materials (I was thinking3/4" ply and that bumpy acoustic foam) should I use? How much distance toleave around the unit for good airflow? What CFM rate? What sized fans? Iintend to use 120MM 12V PC case fans, but I'm worried that a lot of soundwill leak out through the fan ports. I thought perhaps "top hatting" themthe way chimneys and vent pipes are covered would reduce the leakage,especially if the cap had some acoustical foam facing the fan.Any thoughts appeciated. Any flames will be cheerfully ignored!Bobby G.

Aug 15, 2009 40 Replies

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Wayne Boatwright 17 years ago

On Wed 19 Aug 2009 07:06:51a, Robert Green told us...

You're welcome, Bobby. Good luck!

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Central Vac silencer

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