|Is an Overflow Standard From ANSI in Our Future?|
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.
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.