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  1. #1
    Join Date
    Mar 2009

    Default Duct Dampers (Air Flow and Pressure)

    Heating and air condition problems associated with slit level
    homes. i.e..(winter upper level get all the heat, summer lower
    level get all the air condition)
    1. My home is (35 + years old), in Atlanta Georgia, facing west,
    2/4 framing, half brick half cedar siding
    2. I have a 4 bedroom split level home approx 1900 sq. feet with
    8 feet conventional ceilings
    2a. Overall upper level 38/24 feet 912 sq feet
    2b. Overall lower level 24/28 feet 672 sq feet
    2c. Lower level family room 26/12 312 sq feet
    2d. Overall House is 2,184,160 cu inches
    3. The lowest level (family room) is carpet over a slab of
    4. Windows as follows:
    4a. Upper level 10 single pane double hung with storms
    4b. Lower level 3 picture windows without storms
    4b1 5 double hung with storms
    4b2. One double pane slider
    5. I have added more insulation in the attic
    6. I had a problem with the original horizontal (gas) unit
    (parts were no longer available) so I was replaced the unit with
    a new vertical unit and had it installed in my (closed up,
    partially finished) garage.
    Note: when asked what size unit I wanted, I thought a new unit
    would be more efficient than my current unit. Thinking the cost
    of the new unit would reduce in my heating cost. I compares
    utility bills from the old and new using only the BTU usage
    taking into consideration the HEAT DAYS published by NOAA, for
    three years. BOY WAS I WRONG
    6a. The new unit installed it’s also (gas) same as original
    6b. The new unit is a Comfortmaker (Deluxe two stage gas
    furnace) with a AFUE of 80
    6c. The plenum has 5 branches as follows:
    A). 242 sq feet (u-level bedrm #1 and u-level small bath room)
    B). 115 sq feet (u-level bedrm #2)
    C). 300 sq feet (u-level bedrm #3 and l-level family room)
    D). 196 sq feet (u-level bedrm #4 and u-level hall bathrm
    E). 589 sq feet (l-level living, dinning and family rooms)
    6d. 464 sq feet for Miscellaneous halls, foyer, closets plus I
    eliminated a duct to the kitchen

    The given is the my heating unit can only produces 100%
    Then if
    A) Only requires heat for 242 sq feet set the damper at 16%
    B) Only requires heat for 115 sq feet set the damper at 08%
    C) Only requires heat for 300 sq feet set the damper at 20%
    D) Only requires heat for 196 sq feet set the damper at 10%
    E) Only requires heat for 589 sq feet set the damper at 40%

    Question (2)
    Duct Booster fans
    Given my duct runs might be to long for the blower would you
    recommend the installing Duct Booster fans?
    Last edited by tgaliano; 03-17-2009 at 12:58 PM. Reason: question

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