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Old 03-26-2013, 11:22 PM   #1
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Screen in a induced draft WH vent?


I just had a 3" vent put in for an induced draft water heater. The installation instructions call for a screen across the opening. I mentioned that to the plumber; he said he would come back and put one in if I wanted it, but his experience is that screens cause more problems than they solve.

Any opinions on this?

Don't know if it's relevant, but my the instructions for my furnace don't call for a screen on it.

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Old 03-26-2013, 11:40 PM   #2
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The outside screen on opening is probably for some kind of rodent, bird nest,etc. control. If your furnace doesn't have one, your hwh will probably be fine.

If u feel u need it, by all means have him install it. It is possible the screen could get clog with leaves, other debris, etc. Just make sure u check it/clean it every once in awhile.

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Last edited by jmon; 03-26-2013 at 11:45 PM.
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Old 03-26-2013, 11:57 PM   #3
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I wondered that too when we got our 95% furnace, but like you said if the furnace doesn't need one then you're probably ok.
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Old 03-27-2013, 07:13 AM   #4
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The screen, depending on the hole spacing and the kind of material used, offers some impedance to the air flow. This can be compensated for by having the pipe or duct flare to a larger diameter where the screen is installed.
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Old 03-27-2013, 07:36 AM   #5
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Where do you live? If you are in a cold area, the condensation from the exhaust can build up on the screen and clog the exhaust.
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Old 03-27-2013, 09:04 PM   #6
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Chicken wire works will. Unless you prefer a bird nesting in that pipe and croaking and in the meantime your fine family is getting carbon monoxide in the house. Because the dead bird is blocking the exit it is suppose to be using... We could always see if you wake up one morning or not,,,, I think a little screening is a great IDEA....

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