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  1. #1
    Join Date
    Jul 2012
    Posts
    48

    Question about by-pass humidifier and furnace air filter

    With my bypass humidifier dumping the humid air into the return airflow, which is then filtered by a Merv 16 air filter ... wouldn't all the humidity be caught by the filter?

    I'm having a hard time keeping the humidity at 30% RH with the winter now here and it seems my humidifier is running all the time. Is all the humid air being caught by the airfilter?

    Thanks

  2. #2
    Join Date
    Oct 2010
    Location
    Anderson, South Carolina, United States
    Posts
    7,048
    No its not being caught by the filter but it sounds like it needs to be serviced.

  3. #3
    Join Date
    May 2007
    Location
    DC Metro Area (MD)
    Posts
    3,371
    No -- common configuration for bypass humidifiers. When is the last time you checked/replaced the water panel in the humidifier?

  4. #4
    Join Date
    Jul 2006
    Location
    Virginia
    Posts
    4,665
    is the summer/ winter door in winter mode and the water turned on
    We really need change now

  5. #5
    Join Date
    Jul 2012
    Posts
    48
    Water pad is new, water is turned on and flowing (connected to hot) and winter mode is turned on. It is connected to an SLP98V so I'm thinking the low CFM and heat that is constantly runs at is not enough CFM to distribute the humid air?

  6. #6
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    6,444
    i
    Quote Originally Posted by tuffcalc View Post
    Water pad is new, water is turned on and flowing (connected to hot) and winter mode is turned on. It is connected to an SLP98V so I'm thinking the low CFM and heat that is constantly runs at is not enough CFM to distribute the humid air?
    Increasing the air flow through your humidifier with a 6" duct fan will increase the evaporation rate. Larger shorter duct and high speed on funace fan also increases evaporation rate. At 70F, 30%RH, your inside dew point is 37^F. Whats your outside dew point or location? What is the temp of the water going into the humidifier? Check with fingers. Neutral indicates 98^F. 35-40%RH is about as high as you should go to avoid condensation on windows and other cold surfaces.
    Regards TB
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
    Use +Merv 10 air filter. -Don't forget the "Golden Rule"

  7. #7
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,095
    Full model number of the humidifier and the furnace would help us.

    Sealing your homes infiltration would help it retain more of the humidity.
    Contractor locator map

    How-to-apply-for-Professional

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

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