Linear bar grilles, with or without a frame will typically fit into an opening. Inspect your opening to be sure it is clear; in other words, there are no obstructions that might interfere with the grille fitting into that opening.
Then measure top to bottom for the height (H) and left to right for the length (L) of your opening. This information will be provided to your customer support team here to determine the best fitting grille for your opening.
With A Frame or Band Frame grilles (flangeless), the grille size for both the height and length will be 1/16” less than the dimensions of the opening to ensure proper clearance.
With B Frame, C Frame, or Bead Frame grilles (flanged), the grille neck size for both the height and length will be 1/8” less than the dimensions of the opening to ensure proper clearance.
