Inline exhaust design ideas with dampers (pics)

picflight

I would like to upgrade the current loud bathroom exhaust with an inline system.

I am considering Fantech FR150 or kit or Panasonic FV-20NLF1 for bathrooms A, B & laundry room C in diagram below. All three locations are next to each other, maximum length of tubing from inlet to outdoors would be 8'.

My design includes 4 dampers.

Questions/Assumptions

1. Anyone of the timers will vent all 3 areas?
2. Can I find timer controlled dampers that will open and close for locations A, B & C?
3. Is item 2 above worth it?

Doc Holliday

exhaust fans noise/sound are counted in sones. The lower the sone level, the lower the noise. There are plenty of very low noise exhaust fans that you could simply replace with your old one if you were inclined to do so.

Broan.
http://www.broan.com/display/router.asp?CategoryID=500

picflight

Doc,

Currently only location B has a light/fan unit that will be replaced. A & C will be new vents, hence the idea of an inline system.

Doc Holliday

Obviously you're talking about one room if you're only talking about 8' of possible line with dampers. Not worth it IMO. Nor are anything electrical dampers. I see so much headache with damper/zone control problems (stuck dampers, control transformers blown/faulty control boards) in regular a/c I always suggest to not go with them but that's just me.

To give you and idea, no home warranty company under any circumstance covers dampers/controls.

picflight

Doc, thanks for the suggestions and insight.

Doc Holliday

Yup and sorry to rain on your parade, though. Again, just buy a new and quiet fan and you're done. Some of these you can't even tell are on they're so quiet.

picflight

No rain here :-)
I have to work on the existing duct anyway, the previous owner has the sagging duct for the bathroom terminating near the soffit. I can smell soap in the attic after a shower. So I figure if I am going to do a new duct through the roof, then might as well do an upgrade.

REP

I have to back up Doc Holiday on this.
What you want is doable but it is complicated and expensive and provides no notable advantage.
Some suggestions ;
Use Energy Star rated fans as they only use 1/3 the energy to operate.
where ever possible use hard pipe to exhaust.Those flex lines might seem easier but each of those RIBS restrict air flow and gather dust and grease.
Use the extra money you save on quality terminations.
You'll end up with 3 very simple on-off systems with no headaches for years and years.
good luck.