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PostPosted: Tue Nov 14, 2017 7:15 pm 
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A client had reported slow-draining toilets. On inspection, indeed the group of 4 cubicles and another
nearby were all displaying signs of blockage. I removed one rodding cap on the solo loo and it flowed well,I then found and removed an air admittance valve from the group of 4. They then flowed much better,showing no signs of a problem! Both these soil pipes join together in the basement at a Y junction and continue out somewhere.
I deduced that there is a partial blockage further down the line and that the waste flow was not enough to trigger the AAV.
Was I correct in thinking that for an AAV to work as designed, it needs a certain amount
of vacumn beneath it?


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PostPosted: Tue Nov 14, 2017 7:57 pm 
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They’re not designed for rows of WCs Nige.

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PostPosted: Tue Nov 14, 2017 8:35 pm 
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Dickie, what type of vent [that supresses odours] should have been used instead?


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