Need a bit of advice:
We moved into a 1901 house last year with a converted cellar done in 2020, cellar was always dry and never flooded before conversion. Within 2 weeks of moving in we had a washing machine leak so bought a dehumidifier to dry the cellar back out and since then just left the dehumidifier running 4/5 hours a day with windows closed. I'm getting bored now of paying £15 per month to run it and emptying it every 3 days and asking people to empty it when we are away. I believe the previous owners had nothing down there and had no issues but unsure as I don't have their details.
Therefore, looking to utilise natural ventilation instead of mechanical. Just had a small window put in on the external wall and there is a air brick on the other, which leads to a crawl space that then has an air brick to the outside. 1st picture is the air brick by the stairs, no door at the top so opens to the kitchen, and 2nd picture is the window from where the air brick is. I also have a powerful air purifier down there as I work down there and don't want to be breathing in mold spores etc and helps with air circulation.
With the window open or on a latch, would this be enough to create a through-draft from the air brick to the window for ventilation or do I need more? And presume I should leave the window open/ latch 24/7?