cassie Posted October 5, 2020 Share Posted October 5, 2020 SPANC said we needed to have primary ventilation into the house ( fosse with sand filter type treatment.the plumber installed a 32mm. air admittance valve in the kitchen ( for when emptying the sink,etc. ) and a 100mm one, connected to the toilet waste pipe in the bathroom.the SPANC employee said that both of these have to go through the roof.How can we convince her that these valves were invented so that it was not necessary to make holes in the roof!? Link to comment Share on other sites More sharing options...
pomme Posted October 5, 2020 Share Posted October 5, 2020 They are useful for letting air into the system if a partial vacuum is caused by flushing/emptying the sink, but they do not allow foul air out of the system. I suspect they want you to have open pipes at roof height to do that venting out.In this diagram https://assainissement.ooreka.fr/comprendre/fosse-septique-ventilation your valves are the primary ventilation (in). They are expecting a secondary ventilation (out) Link to comment Share on other sites More sharing options...
nomoss Posted October 5, 2020 Share Posted October 5, 2020 Don't they allow a direct vent to atmosphere from the top of the fosse?Preferably with a mosquito screen. Link to comment Share on other sites More sharing options...
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