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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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hugo7
@chiroshi
Drill a few holes in a current brick and screw one of these on top?
https://www.screwfix.com/p/map-vent-fixed-louvre-vent-with-flyscreen-brown-229mm-x-76mm/158hy#product_additional_details_container