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  1. #1
    Join Date
    May 2004
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    58
    Are return Air grill filter boxs worth the cost, to help keep the ducts clean, or would they create more of a neg. presure in the return duct.

    Can anyone recomend a good return grill box (10"x10") in each room.

    Thanks,
    Nick

  2. #2
    Join Date
    Apr 2004
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    3,359
    keeping a home clean may help keep the ducts clean.

    very little fan static is available to handle the added losses from return grill filters.

    other than mobile home applications, why would one even consider this as a filtration option?

    just do it right at the heating / ventilating unit.

  3. #3
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
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    18,836
    Originally posted by nicholasa
    Are return Air grill filter boxs worth the cost, to help keep the ducts clean, or would they create more of a neg. presure in the return duct.

    Can anyone recomend a good return grill box (10"x10") in each room.

    Thanks,
    Nick
    Are you looking for return grilles ,that hold a filter ,or some kind of "box"??


    Filters at the grilles ,will help keep the return duct clean.

    If you have a return in each room,filters at the grilles may be more total "Filter" square inches ,than one filter near the unit,so lower pressure drop,if using the same type of filter.


    Check http://www.hartandcooley.com for filter grilles ,your local contractor can get them or similar in another brand.

  4. #4
    Join Date
    Nov 2002
    Location
    Central Florida
    Posts
    655
    And if you use electrostatic filters in the filter grille in each room you add the advantage of a more efficient filter system without the cost of overcomeing the static drop of a single filter at the unit. A little more maintenance, a lot cleaner return duct system, coil, supply duct system.

  5. #5
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    More filter are will reduce the PD of Electrostatic Filters for sure.This also reduces the fpm(velocity),thru the filter.I've been told that Electrostatics won't work as well at lower velocity as the velocity is part of creating the charge.

    Anyone have data to support or deny this??Thanks

  6. #6
    Join Date
    Aug 2003
    Posts
    626
    Don't forget to check your return ducts for leakage. If they leak, they render the filter useless.

  7. #7
    Join Date
    Apr 2004
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    where you at?
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    3,359
    Originally posted by uktra
    Don't forget to check your return ducts for leakage. If they leak, they render the filter useless.
    exactly.
    leak-test should be done after these grill filters are installed, due to the added back-pressure from the filter potentially creating 'new leakage problems'

    airflow...afterall...takes the path of least resistance.

    > easier solution...high efficiency, high capacity filtration right back at the air handler.
    ...and use a broom every once and a while.

  8. #8
    Join Date
    Nov 2002
    Location
    Central Florida
    Posts
    655
    Has any one found anything about Dash's question on the velocity on Electrostatics? Makes sense that reducing the velocity would decrease the electrostatic charge, but in the right conditions (wrong depending upon the view point) how far and fast do you have to walk an Poly carpet to get shocked? I would love to see any studies if some finds one or more.

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