every 5 minutes for up to 160 m³, 45 - 60 m²
every 10 minutes for up to 80 m³, 25 - 30 m²
every 15 minutes for up to 55 m³, 16 - 20 m²
every 20 minutes for up to 40 m³, 10 - 15 m²
every 25 minutes for up to 32 m³, 9 - 12 m²
every 30 minutes for up to 26 m³, 8 - 10 m²