DIYAPASON-L Digest #985 - Saturday, April 3, 2004
 
Baffle Box Design?
  by <david@dasworks.com>
Re: [Residence Organs]  Baffle Box Design?
  by "S. Durham" <sdurham11@comcast.net>
Re: [Residence Organs]  Baffle Box Design?
  by <david@dasworks.com>
Re: [Residence Organs]  Baffle Box Design?
  by <Pipewheezr@aol.com>
 

(back) Subject: Baffle Box Design? From: <david@dasworks.com> Date: Sat, 03 Apr 2004 10:20:08 -0500   Hi Everybody:   Does anyone know the internal design of a baffle box? It?s used between = the blower and reservoir to reduce wind turbulence and motor noise. = Suggestions or ideas?   Thanks!   David A. Smith  
(back) Subject: Re: [Residence Organs] Baffle Box Design? From: "S. Durham" <sdurham11@comcast.net> Date: Sat, 3 Apr 2004 09:26:33 -0800   David:   When I designed a baffle box I just put two baffles in it so that the air had to snake around like a maze. The most important thing is to line the entire baffle box with a sound absorbing material. Some people use carpeting but I used acoustical absorbing foam which I think is better because you don't have to worry about the carpeting collecting dirt and = dust or having carpet fibers coming loose and going into the rest of the organ.   I would also, if you haven't done so already, install a flexible = connector between the blower output and the wind conduit (if it is galvanized metal = or PVC). This can get rid of motor vibration noises. Another trick is to = put the blower directly on a piece of thick rubber sheeting. Many organ builders use to put some kind of felt or horse hair material underneath = the blowers to stop vibration noises. Unfortunately this material broke down over time.   Does your blower intake have spring loaded doors that close down when the blower is idling and not being played? If not, I'd have a sheet metal person make the doors. This is one of the secrets to the silent Meidinger and Ventus blowers. I hope you can find some of this information useful.   Steven Durham sdurham11@comcast.net   ----- Original Message ----- From: <david@dasworks.com> To: "Residence Organ List" <DIYAPASON-L@pipechat.org> Sent: Saturday, April 03, 2004 7:20 AM Subject: [Residence Organs] Baffle Box Design?     > Hi Everybody: > > Does anyone know the internal design of a baffle box? It?s used between the > blower and reservoir to reduce wind turbulence and motor noise. Suggestions or > ideas? > > Thanks! > > David A. Smith > DIYAPASON-L: a Discussion list for owners and builders of their own > Residence Pipe Organs. > HOMEPAGE : http://www.diyapason.pipechat.org > List: mailto:DIYAPASON-L@pipechat.org > Administration: mailto:owner-DIYAPASON@pipechat.org > > >    
(back) Subject: Re: [Residence Organs] Baffle Box Design? From: <david@dasworks.com> Date: Sat, 03 Apr 2004 16:15:20 -0500   Hi Steven:   Thanks so much for your quick reply. The maze design is pretty much what I suspected. Is there a flapper or blast gate inside, in front of the = intake opening?   The flexible connector has already been done and did help. I plan on also using acoustical absorbing foam inside, even though it will break down in = a few years. By then I'll probably come up with another solution...   Thanks again,   David     On Sat, 3 Apr 2004 09:26:33 -0800 "S. Durham" <sdurham11@comcast.net> wrote: > David: > > When I designed a baffle box I just put two baffles in it so that the = air > had to snake around like a maze. The most important thing is to line = the > entire baffle box with a sound absorbing material. Some people use > carpeting but I used acoustical absorbing foam which I think is better > because you don't have to worry about the carpeting collecting dirt and = dust > or having carpet fibers coming loose and going into the rest of the = organ. > > I would also, if you haven't done so already, install a flexible = connector > between the blower output and the wind conduit (if it is galvanized = metal or > PVC). This can get rid of motor vibration noises. Another trick is to = put > the blower directly on a piece of thick rubber sheeting. Many organ > builders use to put some kind of felt or horse hair material underneath = the > blowers to stop vibration noises. Unfortunately this material broke = down > over time. > > Does your blower intake have spring loaded doors that close down when = the > blower is idling and not being played? If not, I'd have a sheet metal > person make the doors. This is one of the secrets to the silent = Meidinger > and Ventus blowers. I hope you can find some of this information = useful. > > Steven Durham > sdurham11@comcast.net > > ----- Original Message ----- > From: <david@dasworks.com> > To: "Residence Organ List" <DIYAPASON-L@pipechat.org> > Sent: Saturday, April 03, 2004 7:20 AM > Subject: [Residence Organs] Baffle Box Design? > > > > Hi Everybody: > > > > Does anyone know the internal design of a baffle box? It?s used = between > the > > blower and reservoir to reduce wind turbulence and motor noise. > Suggestions or > > ideas?  
(back) Subject: Re: [Residence Organs] Baffle Box Design? From: <Pipewheezr@aol.com> Date: Sat, 3 Apr 2004 16:43:05 EST   Hi David, I built a blower box that had 8 or 9 baffles. But I have a noisy =   5hp blower, that is in my office under the stairs, on a big chunk of = rubber flooring then the blower bag goes through the wall and hooks to the baffle = box. After the baffle box then into a regulator and all that took out the = noise. I built the blower box to fit in a small space and well it was a little to =   big. So I had to jump on it to get it to the floor ounce it was in the = small room. I still need to insulate around the blower because is noisy when it = runs. I put a huge Ford dump truck air filter on the inlet because my office is in =   the shop. Probably more then you wanted to know but food for thought.   Have fun Dennis (fingers) PS stitches come out Monday.