OT, in my humble opinion, mounting orchids on bark or a cork slab is the best way to display them: you really get the idea of what they look like "out there," beyond our pots and our ideas of what makes a "good houseplant.' Good for you!
So here's some advice (maybe you didn't want any but I'm giving you some just the same...)
I don't know how you mounted it (that pic you promised???) but, a little sphagnum moss tucked between the plant and the mounting works wonders. It helps keep the plant moist so you don't have to water it every day, (otherwise, without moisture-retaining medium to grow in, you will have to water the plant constantly to keep it thriving...) and sphagnum is a natural fungicide as well.
About running a fan on your growing area: it does wonders in terms of keeping pests and diseases down, and the plants seem to just downright *like it*. Just remember that all of that air movement will dry things up faster, so keep an eye on your media's moisture retention.
I see a greenhouse going up really soon here......