@luckytran visiting my daughter's Kinder for the first time this week (she starts next year) I was shocked and pleasantly surprised to find not one but TWO fancy air purifiers! This is a small Kinder in rural Australia with a maximum 22 students: was already happy with the odds of low numbers, but this was just such an unexpected bonus. No idea why it has them, if the service provider is extra on the ball, or government grants, but I'm very thankful!