Feliway in a shelter

Would Feliway work in a shelter with a whole room full of cats? Our main cat room has about 50 cats in it and it is a really poorly ventilated room with almost no proper air circulation or fresh air other then sometimes a fan on. The cats are all stressed out, half of them are sick. Does anyone think it would be a good idea to get a bunch of the difussers and have a few plugged in in each room all at once? Or does it work a little better in a home environment with only a couple cats?

Oh and does anyone know of a place that u can order it in bulk? For a good price. thanks

I checked their site (www.feliway.com) and found the bit about coverage:

One vial last approximately 4 weeks.
Active coverage area is up to 650 square feet.
Plug diffuser in an open area, do not place behind furniture.
Phermone Spray calms cats in stressful situations:
Transport
Hospitalization
Boarding and waiting rooms

I think the square footage is the optimal bit, not the number of cats, but you could contact the company for additional information. They should be able to answer your question about buying in bulk.