Windowsill Growing: how important is air movement?

[Blueszz]

I've been away from OB for several years after I had to give up my collection. Back then I grew most of my orchids in a enclosure with artificial lighting. I had 2 small fans running for air movement.
The reason I build that setup was lack of space in my windowsill

Recently I bought some new orchids and I've been reading about them. Several times I read that (strong) air movement is important.

Currently I only have 4 orchids and next week 5 will be added to my small collection (shipment on Monday). That's not enough to make an setup with artificial light, for now. Not enough so use that old setup again.

I might build something in a few months though. Still brainstorming about the layout.

Back to my question. How important is air movement for the orchids indoors, the ones in the windowsill and the ones pulled away from the windows? And I don't mean the rising hot air from the heating (which is detrimental).

Indoors, on the "windowsill" I never used a fan, but I'm thinking about one running oscillating towards the orchids.

Is it only beneficial or will it harm the plants?

It's all about these species:

• Coelogyne cristata
• Restrepia guttulata
• Sarcochilus fitzgeraldii
• Tolumnia variegata var. rosea
• Dendrobium densiflorum
• Haraella odorata
• Neofinetia falcata
• Paphiopedilum lawrenceanum
• Phalaenopsis pulchra