Page 2 of 2 FirstFirst 12
Results 14 to 24 of 24
  1. #14
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    Quote Originally Posted by beenthere View Post
    Low static pressure in the duct permits the air to travel easier in the duct. Since the pressure is lower, it doesn't force out more air then required to the closet supplies.

    High static pressure causes the closet supplies to get more air then the rooms need.
    Exactly!

    Booster fan ,when ducts can't be corrected due to construction.


    Improving ducts in an accessable basement ,could lower the static enough to mean that the ducts in the walls are "now" large enough.

    Lowering static close to the indoor unit ,makes more available for the farthest runs.

  2. #15
    Join Date
    Jan 2007
    Location
    N.E. Ok.
    Posts
    1,363
    Good one Beenthere
    Lightbulb came on when i read this, thanks!



    Quote Originally Posted by beenthere View Post
    Low static pressure in the duct permits the air to travel easier in the duct. Since the pressure is lower, it doesn't force out more air then required to the closet supplies.

    High static pressure causes the closet supplies to get more air then the rooms need.

  3. #16
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,770
    Quote Originally Posted by dash View Post



    Improving ducts in an accessable basement ,could lower the static enough to mean that the ducts in the walls are "now" large enough.
    I didn't want to imply to anyone that may be a DIYer, that automatically the ducts in the wall will be large enough.

    EG: A 7" oval running 8' vertical, and 14' horizontal to the master bedroom that should have 200 CFM.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  4. #17
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,770
    Quote Originally Posted by captube View Post
    Good one Beenthere
    Lightbulb came on when i read this, thanks!
    Its one of the harder things to explain to a customer when you tell them the room that didn't cool well before, will now. When they say, "but you said it won't blow as much air in low".
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  5. #18
    Join Date
    Aug 2007
    Location
    Atlanta, Ga
    Posts
    213
    How much will the booster fan raise the temp of the air coming out of the supply?


    Joe

  6. #19
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,770
    How many watts is the motor. 3.413xwatt=btu
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  7. #20
    Join Date
    May 2008
    Posts
    31
    Quote Originally Posted by coolwhip View Post
    These little fans can kick it out!, but you must realise that they are stealing air from someplace else.
    Wouldn't this also be true if the ductwork was sized correctly in the first place? A system only makes a max amount of airflow that is distributed right?

  8. #21
    Join Date
    Aug 2007
    Location
    Atlanta, Ga
    Posts
    213
    Use 241 and 137....that would equal 822BTU and 468 BTU


    How does that equate to temp


    Thanks


    Joe

  9. #22
    Join Date
    Aug 2007
    Location
    Atlanta, Ga
    Posts
    213
    "Wouldn't this also be true if the ductwork was sized correctly in the first place? A system only makes a max amount of airflow that is distributed right"

    Does the booster fan increase CFM above the system design?


    Joe

  10. #23
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,770
    temp rise =BTU/(CFM*1.08(at sea leel))
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  11. #24
    Join Date
    Jun 2004
    Location
    4H: Hot, Humid Houston H.O.
    Posts
    3,304

    Once installed, you depend on it?

    Quote Originally Posted by coolwhip View Post
    I install Fantec stuff. Correcting the duct work would be great, but sometimes you run into a lengthy branch that has minimal static pressure and virtually no throw.
    So I install a 6 in in-line booster fan with a variable speed controller that's wired to come on with the indoor blower. These little fans can kick it out!, but you must realise that they are stealing air from someplace else.
    If the power were off to such a fan, the added restriction of the fan itself would greatly reduce airflow, right? Just trying to learn what is what. It seems to me that power to the fan would be necessary in order to get anything like the original airflow. But as has been shown before, sometimes my impression can be dead wrong<g>.

    Thank you -- Pstu

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