Efficacy Study of SYN006 HFA MDI in Asthma Patients

Three treatments will be administered in a patient: * A. Two inhalations of Ventolin 100 mcg, * B. One inhalation of SYN006 180/10 mcg, * C. Two inhalations of SYN006 180/10 mcg. Patients will be received the study treatment according to one of the six treatment sequences according to the randomization schedule: 1. A-B-C, 2. B-A-C, 3. C-A-B, 4. C-B-A, 5. A-C-B, 6. B-C-A. The efficacy endpoint is * The change in Forced Expiratory Volume in 1 second (FEV1) within 6 hours. * The change in Peak Expiratory Flow Rate (PEFR) within 6 hours. * The change in Force Vital Capacity (FVC) within 6 hours.