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How to Measure Registers and Grilles

How to Measure Floor Registers and Grilles, Wall Returns and Registers, and More!

Wondering what size vent to order? Follow our simple steps below to properly measure your register or grille. Whether you are replacing a floor, wall or baseboard vent, we have you covered!

Save yourself time by using our Browse by Size pages to find Floor Registers, Baseboard Vents and Triangular Baseboards in the exact size you need. Order today!

Didn’t find your size? Please contact us at 866-258-1554 Monday through Friday, from 8am to 5pm CST. We are more than happy to assist you with any questions or to help you find a custom size vent for a perfect fit!

 

FLOOR:

 
  • You will need to determine whether you need a return air grille or a register for your floor.  Registers have dampers to open and close air flow, whereas returns do not.  
     
  • As shown in the above photos, remove your existing vent and measure the hole opening in your floor (both width and length) and place your order based on that size.  For example, if the hole opening in your floor is 4" x 10", place your order for a 4" x 10" return or register.  The overall faceplate dimensions will be larger to keep the item in place.
 

SIDEWALL / CEILING VENTS & RETURN AIR GRILLES:

  • First, determine whether you need a return air grille or a register for your sidewall/ceiling area.  Registers have dampers to open and close air flow, whereas returns do not.  
     
  • Measure the hole opening in your wall or ceiling and place your order based on that size.  For example, if the hole opening in your wall or ceiling is 12" wide x 10" high, place your order for a 12" x 10".
     
  • IMPORTANT FOR WALL VENTS: Always measure the width of the hole opening first (horizontal measurement). Then measure the height of the hole opening (vertical measurement). Otherwise the fins of the grille or register will be the wrong direction.
     
  • The overall faceplate dimensions of the register or return will be larger in order to mount in place. The overall dimensions should also be listed on the product page of each item.

 

RECTANGULAR BASEBOARD:

 
  • Measure the hole opening in the wall in your baseboard area and place your order based on that size. For example, if the hole opening in the baseboard area is 10" wide x 6" high, place your order for a 10" x 6".  The overall faceplate dimensions will be larger in order to mount in place. 
    The overall dimensions should also be listed on the product page, so you can confirm if this matches the space available in your baseboard trim.
     
  • The depth of rectangular baseboard registers and returns is typically 7/8".  Ensure that you're ordering for the correct application.
 

TRIANGULAR BASEBOARD:

  • If your existing triangular baseboard register or return measures 15", 18" or 24" exactly in length - place your order based on that size.  Keep in mind that there are different height and base projections available.  Therefore, place an order for the correct length and the closest options available for the height and base projection.
     
  • If your triangular baseboard register or return does not qualify for the standard 15", 18", or 24" exactly, then remove the existing register or return vent.  Measure the hole opening and place your order based on that size.  For example, if the hole in the wall behind the triangular baseboard measures 10" wide x 6" high, please your order for the 10" x 6".  Please also keep in mind the overall dimensions and base projection will differ between manufacturers.  Match that size up, along with the hole opening that you currently have.