Replies

1. 
   basswood | Mar 13, 2007 06:15am | #1

   Here is one company that makes a single remote location fan with multiple intakes and a single roof penetration.

   http://www.fantech.net/bathroom.htm

1. 
   hipaul | Mar 13, 2007 06:49am | #3

   Thanks for the link, there's some great stuff from the fantech website.
   The clients already have their fans bought for this job so I don't think it'll work for this project, but I'll keep it in mind for future ones.
   There wasn't really any planning involved before they called me up to do some bathroom remodeling, including putting these fans in, otherwise we may have been able to address the issue before the eleventh hour... They went shopping during a great hardware store sale and ended up getting all the stuff for a bathroom remodel, and that's when they decided to do the remodel!

2. 
   BryanSayer | Mar 13, 2007 04:54pm | #7

   Besides Fantech, another company is Aldes. Different style, so it fits in spaces that the Fantech might not. And I think the new ones have an additional damper that only opens at the bathroom that is turned on. The old ones exhausted all the spaces they were connected to, regardless of which one turned it on.Another cool thing is the delay off switch like the one from EFI. Keeps the fan going a set amount of time after the switch is turned off.

2. 
   cliffy | Mar 13, 2007 06:30am | #2

   Be careful to make sure one fan doesn't just blow into the other room.

   Have a good day

   Chris

1. 
   hipaul | Mar 13, 2007 06:54am | #4

   That's what I was worried about with the fans. Unlike range hoods, I don't think I've seen many bath exhaust fans with a damper right at the unit. If they do have one, then I at least wouldn't be blowing the moist air from one bath to the other, but I'd still have to make sure the ducts were sized correctly.
   But if they do have dampers at the unit, then If one were running, pushing air one way against the damper and the other one were turned on, would it be a problem with pressures working against each other?
   So many questions!

1. 
   DanH | Mar 13, 2007 02:13pm | #5

   Pretty much all bath fans have a damper in the unit. And pretty much all of them don't work. I think at the least a couple of stand-alond dampers in the ducts would be needed.Of course, the other option is to go ahead and install the fans but "forget" to install the guts, then put a Fantech in the attic.
   So convenient a thing it is to be a reasonable Creature, since it enables one to find or make a Reason for everything one has a mind to do. --Benjamin Franklin

3. 
   AllTrade | Mar 13, 2007 02:46pm | #6

   http://www.doityourself.com/invt/1151166

   I would install my Y at the roof location coming down from the vent. Install two of these one for each fan on the legs of the Y to each vent.

4. 
   davidmeiland | Mar 13, 2007 08:07pm | #8

   The short answer is yes. I just installed two fans in adjacent rooms, bathroom and laundry room, with a Panasonic fan in each room. The fans have dampers right at the outlet. A short length of 4" flex leads from each fan to a 4-4-5 wye in the attic. From there a length of 5" goes to a sidewall cap on a gable end. The cap has its own damper too. You can buy inline dampers if you need them.

   There is some know-how involved in sizing ductwork like this, knowing whether flex or rigid can/must be used, etc. I know what I did is within limits based on a chat with the inspector, who busted out his mechanical tables and gave me the parameters.

1. 
   hipaul | Mar 14, 2007 06:04am | #9

   That's just the situation I'm looking at. They already bought two of the super quiet Panasonic fans.
   I've got a great DIY HVAC store where I trust them implicity for sizing any vents or ducts I need. I just don't always trust them on the installation details for stuff like this.
   I think I'll go ahead and put them in, and put in another inline damper or two to really keep the two rooms separated.