Subject: Re: Wind Conductor Sizing Question From: "Tim Bovard" <tmbovard@arkansas.net <mailto:tmbovard@arkansas.net>> Date: Thu, 08 Mar 2001 18:17:55 -0600 Dave asks about running a long length of flexible windline for his = instrument. Without any math to back it up, I'll suggest that you run 6 or 8" thinwall PVC to your chamber. Flexhaust is shaped inside the same as it is outside the tube -- all those peaks and valleys end up creating a large amount of drag on the air flowing inside, which accumulates over long runs. The end result: you need much larger diameter flex line to run long distances and still get the proper amount of wind flowing through. 6" S&D PVC is smooth and clear inside though, and offers nearly no resistance comparitively. Use lots of PVC cement on the joints, and you shouldn't have leakage problems. If you are concerned that one 6" line might not be enough to feed the organ, consider running more than one line from the blower (for each reservior, or whatever). The long runs should only serve to help smooth and cool the wind from the blower. Consider installing a static regulator at the blower in the garage for even better regulation of the wind. (it'll look neat in the corner when 'ya pull in with the car!) Thinwall PVC is available at any home center, usually in 3", 4", and 6" diameters. It's easy to work with, lightweight, and looks neat and professional when installed. Terminating the PVC at chests and components can be done via standard cast metal flanges, or via special PVC flanges, made and sold by Organ Supply Industries. OSI also sells certain particularly useful elbows and fittings sometimes not commonly found in home centers. Hope this helps -- Tim Bovard Little Rock AR

(back) Subject: Fw: [Residence Organs] Wind Conductor Sizing Question From: "VEAGUE" <dutchorgan@svs.net <mailto:dutchorgan@svs.net>> Date: Thu, 8 Mar 2001 20:50:49 -0500 Whatever is the output opening on your blower, go with that up, over, = around and under to your regulators in the swellbox. My blower is 10" output diameter, and I have that in galvanized duct up to the second floor pipe chamber with a canvas sock at the blower end. Rick

Subject: Re: [Residence Organs] Wind Conductor Sizing Question From: "Eric Sagmuller" <ess4@psu.edu <mailto:ess4@psu.edu>> Date: Fri, 9 Mar 2001 12:16:51 -0500 --=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D_-1227964284=3D=3D_ma=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D Content-Type: text/plain; charset=3D"us-ascii" ; format=3D"flowed" I don't fully understand this either. It appears to somewhat depend on the design of the blower and the static pressure rating. I don't know how Zephyr's compare to the Spencer's but the online Spencer manual shows the following. 400 CFM 8" line 700 CFM 10" line I basically used this information for my project. My blower has a 12" outlet which stays 12" to the Static regulator. Then from there I have a 10" duct running to the second floor Swell chamber. My Great will be in a somewhat different location and will get an 8" line run to it. I too would have liked to use smaller duct but thought I'd better use the Spencer advice. I'd be curious to see what some other blower manufacturers recommend. I suspect that flexible wind conductor may offer a little more wind resistance and turbulence. I used Spiral duct and made MDF boxes to interface the duct. Have fun, Eric