Miltoniopsis in Terrarium or Clear Grow Tent

[Amichab]

My humidity has been hovering around 35-40% and I think my miltoniopsis is suffering. I keep her on a humidity try and a cool mist humidifier going majority of the time. Sometimes it runs out of water and it turns off. There is a fan blowing from overhead. I never let her get bone dry.

I would like to get her through the dry months (which would be winter for me) easier. I was thinking that a DIY clear grow tent on a cool windowsill might work well to increase the humidity for her. Does anybody have experience growing miltoniopsis like this or in a terrarium? My fear is air flow. I think I can keep a mini fan inside the enclosure but I worry about fungal infections from not enough fresh air.