Orchid won't bloom..Please Help

[tntate786]

I have an orchid that just doesn't want to bloom. Here is a it's situation:

I saved it from a trash can at work about 2 years ago. It was close to death, but after being potted it has done very well. It is a phael, as far as I can tell. It has 6-8 leaves, all very nice and green. It has a good amount of air roots, and seems quite healthy, but it has not bloomed in the 2 years I have had it.

I have 4 other orchids in the same area, another phael that I have had with it is on it's third bloom since I bought it. the others are much newer.

Any ideas on why it will not bloom?