Maxitrol 325-3 Regulator


Old 02-29-08, 05:38 AM
Thread Starter
Join Date: Jan 2008
Posts: 86
Maxitrol 325-3 Regulator

Living in the country has advantages and disadvantages. Installers are free to do whatever they can get away with.

I have a 2psi NG system with Maxitrol regulators in three places. Two of these are in the basement. While reading, I discovered that the regulators should be vented outside the house. At the very least, Maxitrol sells an accessory that will reduce the venting to a safer level. These still have the drilled plug. The third regulator is in the attic. I haven't checked it and the attic is the least of my worries. I understand that diaphram rupture is somewhat rare but my luck is the worst.

If a copper vent line is run to the outside my house should be protected. Will this also protect the appliances? Can a venting regulator be heard?
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Old 02-29-08, 04:52 PM
Join Date: Jul 2005
Location: New York
Posts: 723
Maxitol regulators only need to be vented, unless, the regulator is mounted horizontal and upright (with the adjustment stem straight up) and a vent limiter placed on the relief valve port. The vent limiter looks like a brass hex cap over the outlet side of the regulator. Unless these provisions are addressed, the regulator must be vented to the outside of the house. All of the maxitrol regulators I install have a vent limiter installed from the factory.

A copper vent line should be protected just like any other gas line. The only difference is it will not have constant pressure running through it. The regulator will vent only if there is a diaphragm rupture or the regulator is over-pressurized.

A maxitrol regulator will not protect the appliances installed, it's only purpose is to bring the gas pressure to a working level. Each appliance will have it's our regulating devise to protect it whether its a regulator on a cooking range or a gas control valve on a furnace.

You may or may not hear a venting regulator. If the sound is audible, you will hear a faint hissing. On the bright side, you should certainly smell the gas.

More information can be obtained about the Maxitrol regulators on the Maxitrol website:
Old 02-29-08, 07:59 PM
Join Date: Dec 2005
Posts: 458
Cant add anything to that Hank. Excellent answer.
Old 03-01-08, 03:56 PM
Thread Starter
Join Date: Jan 2008
Posts: 86
Thanks Guys. I'll likely vent these regulators outside.

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