Water heater flue and radon mitigation pipe in close proximity - fire hazard??


I had a radon mitigation system installed in my house prior to purchase. The other day, while doing some sealing in the attic, I noticed that they have the radon PVC pipe running right next to the water heater flue to get from the basement to the attic. You can see a couple pictures here:
http://www.msu.edu/~galedav1/pic1.jpg
http://www.msu.edu/~galedav1/pic2.jpg
Is it OK to have the radon pipe running next to the water heater flue? I checked with the city, but they claim the code only says to "install per manufacturer's instructions." Elsewhere I have heard there should be 2" of clearance between the flue and anything flammable. Is the PVC pipe considered flammable?
Thanks in advance!
Dave
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On Apr 30, 2:20 pm, snipped-for-privacy@excite.com wrote:

That looks OK to me. I don't know the codes but the flue on a modern heater doesn't get hot enough to damage the PVC. Look at it this way, if it were going to cause a problem it already would have. Use a flashlight and take a close look to see if the pipe has been melted. I'm guessing not but worth a look.
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PVC for use in building must have some fire retarding properties. That does not mean it cannot burn with another source of igniton. I doubt it is going to burn the house down, but get some clearance between them. Contact can eventually meld the PVC if it gets hot enough. Just a wedge to get an inch or so should do the trick.
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snipped-for-privacy@excite.com wrote:

they're not old ones, best keep watch on the situation.
Joe
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