Found this on a parrot forum
This is information regarding the Feliway diffuser and caged birds:
"Can I plug a Feliway® Diffuser in a room where there are caged birds?
If a caged bird can handle wax-based non-scented candles, there shouldn’t be a problem (the diffuser is a wax-based paraffin oil, similar to a candle, and it is odorless). However, some birds are known to have sensitive respiratory systems therefore we recommend using the diffuser in a different room."
"Tips for using Feliway, from my conversation with Farnam (a vet )
- The general rule of thumb is that if a bird can "handle" wax-based non-scented candles OK, there shouldn't be a problem. The Feliway diffuser is a wax-based paraffin oil, similar to a candle, and it is odorless.
- Feliway is species-specific, so birds and humans do not "recognize" the pheromone nor are they affected by it.
- One diffusers lasts roughly 30 days. They recommend 60-90 days of use to affect feline behavior.
- One diffuser treats 650 square feet of living space. In this case, where a bird is present who may be sensitive, the Farnam representative recommended housing the parrot in a room without a diffuser to be safe. This would negate the "treat the whole house" recommendation for cat behavior modification, but strikes a balance between the health of the bird living and the use of Feliway for the cats. ("http://forums.avianavenue.com/index.php?threads/feliway-for-cats-safe-for-birds.166165/)
the part I bolded is what worries me