Vandas, Ascocendas, and other orchid varieties require good air circulation for optimum health. But beware: providing too much air circulation, and your Vanda can dehydrate.
If there’s too little air circulation, that creates conditions where fungal growth is encouraged. Ideally, put your Vanda in an area where a nice, gentle breeze is present. Providing that kind of environment in most areas can be accomplished by simply keeping your orchid outdoors.
Choose outdoor locations that allow for free movement of air while still sheltering the plants from harsh gusty winds (and, of course, direct sunlight), especially cold ones.