Patients with two or more admissions to hospital for asthma exacerbation in the past 12 months or any admission to intensive care ever.

Occurrence of acute asthma exacerbations or lower respiratory tract infections in the 4 weeks before study entry

History of near fatal asthma

History of cystic fibrosis, bronchiectasis or primary ciliary dyskinesia

Diagnosis of restrictive lung disease.

Patients treated with systemic corticosteroids

Significant medical history and/or treatments

Efficacy Study of the Product "CHF 1535" Versus Beclomethasone (BDP) and Free Combo in Asthmatic Children