BiolanFan with wind drive, effective ventilation with wind energy, electricity not required

Biolan Wind-Powered Ventilation Fan, Silent, Energy Saving for Sheds and Garages, Efficient Against Moisture and Mould. Rain Protection. Includes a removable and washable insect net.

Biolan Ventilation Tube Package for Biolan Simplett Eco Dry Toilet

Studor 20297 Maxi-Filtra Septic Tank Drain Vent Two-Way Active Carbon Filter, 3- or 4-Inch Connection