FIREWALL AND TOILET

I just wanna ask if this is allowed. Since firewall structural integrity can't be compromised no matter what which integrating plumbing system in it will do. But is it allowed that a toilet can be in the side of the firewall BUT it has its own plumbing wall. The plumbing wall is sandwiched between the toilet and the firewall. Please based on the National building code of the Philippines.

I hope you get what I want to say. I'm just satisfying a curiosity hehe . Thank you!