Replace Duct vs. Manual Damper

Discussion in 'HVAC Heating & Cooling' started by jevonmckinzie, May 11, 2009.

  1. jevonmckinzie

    jevonmckinzie New Member

    Messages:
    19
    Location:
    Chicago, IL
    I am remodeling my home, and I am adding more insulation to the walls and sealing all the air leaks. Basically, some rooms get more air than other rooms. I am wondering if it is possible to install a manual damper inside the duct or is it better to replace the branch duct with a smaller one.

    For example, in the bathroom on the main floor, the current duct is a 6" round duct, which delivers about 100 CFM. However, the room is only 40 sq. feet and really only needs 30CFM, or a 4" round duct.

    I plan on having a variable speed furnace installed that is sized correctly, because the current unit is a single stage and it basically dumps about half of the rated CFM into the basement, which makes it feel like an oven in the winter and a freezer in the summer.
  2. 3m

    3m New Member

    Messages:
    76
    Location:
    NY
    When they install a new furnance have this installed then you can balance the airflow, they must be installed on all supply lines off the main trunk

    Attached Files:

    Last edited by a moderator: May 11, 2009
  3. jevonmckinzie

    jevonmckinzie New Member

    Messages:
    19
    Location:
    Chicago, IL
    Thanks!!! Seems like a much cheaper solution.
  4. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,797
    Location:
    Cave Creek, Arizona
    air flow

    The cheapest solution would be to close the dampers on the registers so they let less air through.
  5. Thatguy

    Thatguy Homeowner

    Messages:
    1,459
    Location:
    MD
    While maintaining reasonable air flow thru the HX.
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