a protective breathing hood comprising a hood made of a stretchable fire resistant material and which is also impermeable to gases and biologic material . the hood is sized and shaped for placing over a head of a user in an airtight manner with an opening of the hood scalingly engaging a neck portion of the user . at least a visor portion of the hood is transparent and a pair of respiratory units are disposed offset with respect to the nose location . each respiratory unit comprises a housing formed with an inhalation flow path accommodating activated exhalation flow path fitted with a one way exhaling valve , wherein at a donned position of the hood a chamber is formed at a mouth / nose location thereof .