Custom Metal Products of Distinction Since 1909

The Guide to Measuring Perforated and Linear Bar Grilles

Posted Mon, August 1, 2016

Whether you're renovating a classic building or constructing a new modern space, choosing between linear bar grilles and perforated grilles is very much on a per-project basis. The type of project or look you’re going for will greatly affect your decision. However, no matter which style you pick, there’s a lot you need to consider when choosing architectural grilles. One of the major decisions you need to make is how to select the dimensions of your grille.

In this guide, we’ll go over a few of the major types of architectural grilles you’ll have to choose from, and then dive deep into understanding the correct way to measure your openings to achieve a perfect fit. Certain grilles are measured differently depending on your frame and other factors. You can find more information on our architectural grilles and frame options in our catalog.

Linear Bar Grilles

For linear bar grilles, the most important starting point is to understand what kind of frame your model of grille uses. There are two types of linear bar grille offered at Coco Architectural: flangeless and flanged. They can be measured similarly. However, flangeless requires a bit less breathing room, as it will be mostly flush with the wall or floor it is installed into.


Flangeless (flush-mounted) bar grilles

For a flangeless bar grille frame — such as our A, D, E, and Core Only options — the best choice is to cut your wall or floor opening 1/16” larger than the overall grille size. In the image to the right, the grille size is represented by X for length and Y for height.

Flanged bar grilles

For a flanged bar grille like our B and C frame, we recommend that the opening be cut 1/8" larger than the specified neck size. Neck size is the width of the bars only, not counting the frame around it. In the image to the right, the grille size is represented by X for length and Y for height.

Perforated Grilles

For perforated grilles, things get dicier. But the expert craftsmen and engineers here at Coco Architectural can help you every step of the way and offer guidance if you need assistance. Below is a brief run-through of the process of cutting the appropriate opening size for your perforated grilles.

First, measure your wall, floor, or ceiling opening for the proper length (X) and height/width (Y). When specifying your perforated grille, you will need to include a perimeter border dimension for the height/width and length dimensions. If you have any issues getting the right border dimensions, we would love to help you. Making sure this step is right will allow for any required features, such as mounting holes and provide you with an aesthetically pleasing result.

Keep in mind that the perforated pattern should not exceed the opening dimensions (C and D), and additional clearance will be required when adding stiffener bars. Equal border sizes can also be  accommodated by our team.
Hopefully this guide has helped you to determine the size openings you need to have and what kind of architectural grille you’ll need to occupy the space. If you’re ready to discuss your options further or plan out the workload for your project, our team is always ready and eager to assist in your project. Our full manufacturing division means that we can achieve any custom order you have, and build all of your grilles out to the exact specifications you need. Contact us today to learn more about architectural grilles and how we can help in your project.

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