Investigate Two Trial Models; Vienna Challenge Chamber (in and Out of Season) and Park Study (in Season) Using a Drug for Seasonal Allergic Rhinitis

"Subjects will receive the following treatment regimen over one of two dosing periods within each of the three study phases:~\- Intranasal FPANS (Fluticasone Propionate aqueous nasal spray) 200 mcg once daily for 8 to 14 days i.e. 4 actuations (2 per nostril) daily, where each actuation delivers a volume of 100 mcL (microlitres) i.e. 50 mcg fluticasone propionate."

"Subjects will receive the following placebo treatment regimen over one of two dosing periods within each of the three study phases:~* Intranasal FPANS placebo once daily for 8 to 14 days (i.e. 4 actuations (2 per nostril) daily, where each actuation delivers a volume of 100 mcL."