Effect of Novel Exhalational Delivery System With Fluticasone (EDS-FLU) on Eustachian Tube Dysfunction (ETD)

Inclusion Criteria: * Age greater than or equal to 18 years old, \<80 years old * Chronic Eustachian tube dysfunction defined as: * Symptoms in one or both ears \> 3 months AND * ETDQ-7 score \>14.5 AND * Type B, C, or As tympanometry * Female subjects of childbearing potential must have a negative urine pregnancy test at screening and throughout the study duration. Exclusion Criteria: * Age \<18 years old * Known history of otologic surgery (excluding myringotomy or myringotomy tubes) * Use of any additional intranasal medication * Tympanic membrane perforation * Adhesive otitis media * Cholesteatoma or significant retraction pocket * Middle ear effusion * Nasopharyngeal tumor * Any history of head and neck cancer * Any history of head and neck irradiation * Any history of temporomandibular disorder or prior surgery to the temporomandibular joint * Any medical condition that the investigator deems inappropriate for enrollment