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Old 03-25-2013, 11:48 AM   #1
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hot water tank exhaust problem?


Is it right for the exhaust on my water tank to be open like that? When it's running I can smell a gas smell and feel hot air coming from around that space
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Old 03-25-2013, 11:57 AM   #2
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hot water tank exhaust problem?


mine has about a half inch gap as well. looks real similar to your pix.
not saying it's right or wrong, just really similar to yours.

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Old 03-25-2013, 12:10 PM   #3
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hot water tank exhaust problem?


You should not have any smell of gas, but yes, you do need that air gap for it to properly function. You may not have enough makeup air in that space.
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Old 03-25-2013, 12:22 PM   #4
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hot water tank exhaust problem?


First, I would cleaned and service the vent pipe and make sure nothing is blocking it.

1/2 inch gap not too bad, should be some gap though. Maybe a round proper fitting vent may help. Your current vent may not pull the exhaust out efficiently enough.

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Old 03-25-2013, 12:31 PM   #5
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hot water tank exhaust problem?


There should be enough make up air, it's open to my whole basement, (just framing is up) blocked vent pipe was my guess unfortunately I can't check it out right now as I'm working away but i'll look into it. Thanks everyone
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Old 03-25-2013, 12:40 PM   #6
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hot water tank exhaust problem?


preferably the hot water tank and furnace should have their own room with make up air. It is possible for range hoods, bathfans etc. to cause a negative pressure in your house and create a dangerous situation with flue gases. I hope you have a CO1 detector.
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Old 03-25-2013, 12:49 PM   #7
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hot water tank exhaust problem?


I do and I also got a gas tester from work and checked it out when it was running, no alarms. It will be in its own Room soon, well that is unless I need to get a new one then it will delay the wall building
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Old 03-25-2013, 01:42 PM   #8
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hot water tank exhaust problem?


It sounds as if you are okay then
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Old 03-25-2013, 01:44 PM   #9
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hot water tank exhaust problem?


I agree, wife's worried though
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Old 03-25-2013, 02:09 PM   #10
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hot water tank exhaust problem?


What in the world is the crap that was cought in midair by your flash? It looks like sawdust, cellulose, rockwool or something. I would check your blower and see if the fan buckets are all gummed up with that stuff. Also check your flue output, and see if its clogged up.

DO you do woodworking around this HW Heater?
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Old 03-25-2013, 02:19 PM   #11
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hot water tank exhaust problem?


Just a note here. it is normal to get a little flue gas leakage at that gap until the flue heats up enough to draft properly. Just another reason I like direct vent appliances
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Old 03-25-2013, 02:54 PM   #12
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hot water tank exhaust problem?


I'm not sure what you mean caught in mid air I dobt see anything, my wife took the picture, I did some sawing close by just recently and just cleaned up the saw dust with the shop vac, but the smell was there before that, I'll make sure it's cleaned better though
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Old 03-25-2013, 04:31 PM   #13
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hot water tank exhaust problem?


Maybe the stuff in mid air is an illusion, but it is pretty obvious that someone took a shop vac or something and ran it in a serpentine pattern on the sloped portion of the vent hood to remove sawdust. Now if you were cutting MDF or something put together with resin, that could have been drawn up through the flue, became heated, and stuck to the fan blades. Maybe that's what you smell, or maybe the flue is gummed up along with the fan.

Elementary my dear Watson. Im going for a walk with my dog, Ive been doin this DIY posting too much lately..............
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Old 03-25-2013, 04:42 PM   #14
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hot water tank exhaust problem?


I was cutting 2x4s and a sheet or 2 of plywood, Def something to look at, but like I said the smell was there before I started the work in the basement
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Old 03-25-2013, 06:40 PM   #15
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hot water tank exhaust problem?


Yes that is normal for old gas hot water tanks. It is not normal if hot gas is going into your room instead of up the chimney. If that is the case you should see why the chimney is not drafting {accepting the fumes).

The gas is carbon monoxide and can kill off you family in a tight house if not corrected.

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