100mm Filter grid charcoal sewer vent for PVC pipe

I wanted to make my diy charcoal vent for a sewer. I found the cover here : https://www.printables.com/model/108736-rain-cover-for-drainage-ventilation-pipe/comments I have made this 100mm diameter grid with 4mm holes, 5mm thickness. I have bought a 100mm sewer straight pipe connector, the grid comes inside and hold in position when the pipe is installed inside. Add some activated carbon and closed wit the rain cover. I presume you can use that grid also to prevent mice, big bug to enter for ex…

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