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Old 03-16-2009, 03:43 PM   #1
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Air Gap required/recommened for Dishwasher?


Minnesota Administrative Rules

4715.1250 DISHWASHING EQUIPMENT.

Every dishwasher in a building for public use shall discharge to the drainage system through an air break. If a floor drain constructed without a backwater valve is installed on the individual dishwasher branch, the dishwasher may be connected directly to the drainage system. The water supply to any dishwasher in which the supply opening is located below the spill line of the machine shall be protected with a vacuum breaker.
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Is my house "a building for public use?" thus I need to clutter my sink with a air gap gizmo? Should I do it even if it's not required? No floor is drain around.

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Old 03-16-2009, 05:33 PM   #2
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Air Gap required/recommened for Dishwasher?


Your house is a private residence. I am not a plumber but do not think that code applies to private residences.

Maybe a real plumber will chime in.

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Old 03-16-2009, 08:43 PM   #3
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Air Gap required/recommened for Dishwasher?


Call your local codes and see if it applies.

I bet it does

Dishwasher connections need a form of back flow protection. The idea of connection to a drain without a air-break or anti back flow protection is dumb.

Just think when the system clogs and overflows and runs right into the dishwasher. Well at least the morning turd will be washed and polished.

If you have a food disposal make connection there.

If not then install an extension with a DW connection.

Play it safe and right

Last edited by Plumber101; 03-16-2009 at 09:25 PM.
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Old 03-16-2009, 09:41 PM   #4
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Air Gap required/recommened for Dishwasher?


Quote:
Originally Posted by brokenknee View Post
Your house is a private residence. I am not a plumber but do not think that code applies to private residences.

Maybe a real plumber will chime in.

Not only plumbing but, all codes building, elec, hvac ,gas , etc
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Old 03-16-2009, 10:26 PM   #5
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Air Gap required/recommened for Dishwasher?


Not all areas required air-gaps on dishwashers. Many that did, have reversed their position since the air-gap caused more clogging and problems than they solved. I install DW's with the drain hose formed into a high loop (up to the underside of the countertop) before going down and connecting to the drain piping. If the plumbing backs up that far, you'll be too busy bailing the sink to worry about the DW.
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Old 03-16-2009, 10:40 PM   #6
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Air Gap required/recommened for Dishwasher?


here they are required to run DW drain line to a vent ( air gap ) (mounted on the sink.) Form the vent Y to the drain

Last edited by kenmac; 03-16-2009 at 10:43 PM.
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Old 03-16-2009, 11:44 PM   #7
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Air Gap required/recommened for Dishwasher?


Some areas/States accept someones word/idea on what is needed for plumbing to work safely and properly. I really liked Ohio's way of determining what would be put into the code for drainage piping. A set-up of glass piping was made and it was tested 100 times. If the issue they were testing failed once, it would not be added/allowed in the code. This was how they realized that vent piping did not need to be run primarily vertical. Ohio code originally dictated that no more than 20% of the vent line(s) could be horizontal. After testing, as long as the piping is continuously pitched upwards, the only requirement is that it exit through the roof. They also found that coffee grounds do not swirl and clean the pipes as many people think.
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Old 03-17-2009, 09:36 AM   #8
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Air Gap required/recommened for Dishwasher?


This is not to say that a dishwasher in a private home is excused from having an air break however a house is not a building for public use.
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Old 03-17-2009, 09:51 AM   #9
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Air Gap required/recommened for Dishwasher?


My "opinion" describing "for public use" is that it is commercial property and not a private home. Codes for commercial are different from private. A homeowner can do plumbing repairs to their home, although permits may be required, but a business owner is not permitted to do work on their commercial property plumbing lines.

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