I posted this in my original Drainage alterations thread but it's a different question really so I've started a new thread. Apologies to the mods if I've done wrong 
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I'm going to be fitting a Wall-Hung Vitra toilet onto a Geberit frame. The frame comes with a 90° 90mm bend piece that firmly attaches to the frame but I wanted to take the pipe straight out of the back of the toilet, through the wall outside as I've seen a few threads that say to keep 90° bends to a minimum. Seeing as if I used the 90° piece supplied, there would be three 90° bends before the pipe disappeared under ground level, I also bought one of the Geberit straight 90mm/110mm connection pieces.
The question is:- There is a reasonable amount of "give" in the frame clip so I could angle this down easily to match the 92.5° (and more if required) bend that I will be fitting outside the wall to give a 2.5° slope but I've also seen reports that this will not be enough of an angle so close to the toilet to give a good clearance rate, especially when using a low-flush volume cistern which the Geberit is, or a 90mm outlet toilet pan which the Vitra is. Admittedly, the cistern can be adjusted for a 7.5L flush which may help but I just wanted to make sure I get this all correct in my mind before I start in earnest.
Is there a "hard and fast" way to install this or will my original idea be OK ?
TIA.
.I'm going to be fitting a Wall-Hung Vitra toilet onto a Geberit frame. The frame comes with a 90° 90mm bend piece that firmly attaches to the frame but I wanted to take the pipe straight out of the back of the toilet, through the wall outside as I've seen a few threads that say to keep 90° bends to a minimum. Seeing as if I used the 90° piece supplied, there would be three 90° bends before the pipe disappeared under ground level, I also bought one of the Geberit straight 90mm/110mm connection pieces.
The question is:- There is a reasonable amount of "give" in the frame clip so I could angle this down easily to match the 92.5° (and more if required) bend that I will be fitting outside the wall to give a 2.5° slope but I've also seen reports that this will not be enough of an angle so close to the toilet to give a good clearance rate, especially when using a low-flush volume cistern which the Geberit is, or a 90mm outlet toilet pan which the Vitra is. Admittedly, the cistern can be adjusted for a 7.5L flush which may help but I just wanted to make sure I get this all correct in my mind before I start in earnest.
Is there a "hard and fast" way to install this or will my original idea be OK ?
TIA.
