Howling return

Discussion in 'HVAC Heating & Cooling' started by hattrick58, Jul 17, 2008.

  1. hattrick58

    hattrick58 New Member

    Messages:
    5
    Just had a new heat pump system installed 13 seer 3 ton unit. The issue I'm having is the return is howling (as opposed to whistling). When I lower the grill so only the filter is exposed, it's nice and quiet and of course this is my goal. The return is 20" x 20" so I'm thinking of possibly changing the grill out. However, being completely ignorant of HVAC, I don't know if this would be detremental to the system. I've read that too much air flow could shorten the life of the handler and I suspect in order to eliminate the howl, the airflow would be increased. If you have any guidance, suggestions or meaningful insights, I would be most apprecative.
    Thanks, hattrick.
  2. geno54

    geno54 New Member

    Messages:
    29
    20 x 20 is too small. You need a larger return to reduce the velocity and the noise.
  3. Marc46

    Marc46 HVAC Contractor

    Messages:
    102
    Location:
    Central Florida
    The notion of "too much" airflow is incorrect.
    Your evaporator blower motor, and wheel, only has the capacity to move a given amount of air.

    It can't pull TOO much. You could put in a 36X36 return grille, and the unit would only pull up to it's maximum potential.

    Some cheap return grilles are notorious for making noise.
    If you wish to maintain that size, you have 2 options. Change the FB Grille to an "eggcrate" style, which has a much lower restriction, or add a small remote return to another part of the home.

    There are other details involved to be able to tell you exactly what to do.
Similar Threads: Howling return
Forum Title Date
HVAC Heating & Cooling Chilly Finished Basement Needs Cold Return? Mar 26, 2014
HVAC Heating & Cooling Can forced air supply duct be run through panned returns? Oct 28, 2013
HVAC Heating & Cooling Questions about fresh air return for gas furnace Sep 28, 2013
HVAC Heating & Cooling Adding an air return Aug 21, 2013
HVAC Heating & Cooling circulating pump on return continuously running on gv90+ Feb 24, 2013

Share This Page