Page 2 of 2 FirstFirst 12
Results 14 to 17 of 17
  1. #14
    Join Date
    Apr 2004
    Posts
    7,680
    Why not just use turning vanes?

  2. #15
    Nice pink dress.

    Mine is not that complicated. Very simple, brand new house. Airflow is more than enough in entire house. I'll block it off for a couple of day before cutting just to be sure.

    Thanks everyone for the advice.

  3. #16
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    Originally posted by alexb
    Here's a PIC of the end of one of my duct runs.

    I know there's do DIY here, but I'm just stating what I've done. I've cut the end off this run, and I'm putting in a 45-degree bend from the main line, to the line dissapearing off the top of the picture. The small 5" round going to the left will be cut off & capped; it goes to a tiny bathroom.

    I'm counting on this providing MUCH more airflow to the 15' of duct that connects to the line that dissapears off the top of the pic. I suffer from v. poor airflow in this room; not meeting CFM requirements..
    -Alex

    The duct that you refer to will get more air with your changes,but I wouldn't think it would be a lot more ,if that's the end of the only trunk line.

    Reason is,it's likely that is the longest run, in Total Equivalent Length(TEL),from the indoor fan.So the changes likely need to be made closer to the indoor fan,to increase the Static available at the end of the trunk.


    The "takeoff" fiiting is used there is not a great loss,likely a 45° "bend" may be worse.An unknown is what exactly your 45° turn will look like,and the effect of making the branch duct,more of a trunk duct,ie taking a branch out the end of the trunk,will increase air flow.

    You will gain all or most all of what went to the bath.

    Turning vanes for the turn would be an improvement,but you need to looh at adding vanes between there and the indoor fan,or some other method to reduce the PD and TEL of the duct ,to get much more air at the "end' of the trunk.


  4. #17
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    Turning vanes ,if needed is a good idea.

    Doc,I'd say any increase in ESP,would have an effect on the branch in question,as it's likely the longest path,in TEL,in the home.

Page 2 of 2 FirstFirst 12

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event