Jedco Size Guide

How can I be sure that I order the correct size?

It is very easy to ensure that you order the properly sized vent the first time. If you're looking for a return air grille size chart to pick the right one, you need to be aware of a few basic rules.

    1. Air registers & grilles are ordered by the size of the actual duct opening in the wall, floor or ceiling that the vent will fit into or cover, not the overall size of the existing vent cover!

    1. If you are ordering a wall return air grille or return air filter grille, please note that these are directional. You may order a horizontal grille (blades run in the long direction) or a vertical grille (blades run in the short direction).  You must order by the duct opening size WIDTH X HEIGHT. This is critical if the grille is on the wall. It is generally not important for a ceiling application but you may have a preference for cosmetic reasons.

*If the hole size is 30 wide by 10 tall,
you would order size 30x10
  *If the hole size is 12 wide by 24 tall,
you would order size 12x24

    1. If you are ordering a supply register for either the wall, floor or ceiling, the direction that you order it in is not important. As a matter of convention we list all wall and ceiling registers with the larger hole size first followed by the smaller size second.

      For all floor registers and return grilles we list the smaller size first and the larger size second. Again, this is just a matter of convention and is not critical in ordering.

    1. If you are still not sure how to measure air vents and what size to order please call us! We are more than happy to assist you in your selection!



      a vent through which the air will blow out into the room, it will usually have a damper on the back.


      the mechanism on the back of a supply register that gives you the ability to open or close the airflow through it. It will typically be handle or lever operated though it may also be screwdriver operated.


      a grille through which the air is taken back from the room and into the return duct (it is sucked back into the wall). This may be a flat cover which is non-operable, or it may be a filter grille in which case it will have a hinged face that will open or swing down so that a filter can be put into the back filter rack.