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Is an Overflow Standard From ANSI in Our Future? Print E-mail


There have been rumblings around the industry that overflow systems on vanity tops, which are currently used in the United States at the discretion of the individual manufacturer, may at sometime in the future be subject to regulation.  In the United States,  under  the ANSI Z124 standard, the need or flow rate of an overflow system is not regulated,  but the Canadian CSA B45.5 standard does have a test for flow capacity of overflows.  It is therefore a possibility that a new, harmonized standard would ultimately be adopted.


If the standard is passed in accordance with the CSA standard, it would call for a 1.74 GPM (gallon/minute) overflow drainage capacity with the overflow system capable of draining as much water as introduced into the bowl via the water supply over a specified period of time. The test would eliminate the regular drain from the equation as it would presumably be considered plugged or non-functional.

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Gruber Systems' oval overflow tubing provides sufficient drainage capacity to meet such a standard.  Our own internal testing of the oval overflow equipped systems delivered results varying from 3.9-4.4 GPM, comfortably over the rate mentioned in the CSA standard. However, the round overflow system may have difficulty in meeting this flow requirement.

As always, manufacturers of vanity bowls need to be aware of your own local, regional, and national standards that affect your marketplace.  Feel free to contact Gruber Systems whenever you have concerns about your ability to meet these requirements.

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