A respiratory ventilation device, intended to send a flow of air, generated by a fan, into a duct, the duct extending between the device and a respiratory mask, intended to be worn by a user, the device extending between a lower end, forming a bottom, and an upper end, the device having: - a ventilation chamber, containing the fan; - a humidifier, connected to the ventilation chamber, and intended to humidify the air blown in by the fan, the humidifier having a reservoir intended to accommodate water; the humidifier having: - a connecting chamber, adjacent to the ventilation chamber, and comprising: • an intake opening, leading out of the ventilation chamber; • an exhaust opening (13 o), leading into an exhaust channel, the exhaust channel being configured to be attached to the duct; - a humidification chamber, having the water reservoir; - a first opening (15 1) and a second opening (15 2), separate from one another, formed between the connecting chamber and the humidification chamber; the device being characterized in that: - the connecting chamber extends between the humidification chamber and the ventilation chamber; - the device has a separating wall extending between the connecting chamber and the humidification chamber, the first opening (15 1) and the second opening (15 2) being made in the separating wall, the separating wall being arranged such that: • the humidification chamber extends between the bottom and the separating wall; • the connecting chamber extends between the separating wall and the ventilation chamber. - the connecting chamber defines a first channel (16 1) between the intake opening and the first opening, and also a second channel (16 2) between the second opening and the exhaust opening, such that: - the first channel is arranged to direct air from the ventilation chamber through the intake opening to the humidification chamber, through the first opening (15 1); - the second channel is arranged to direct air from the humidification chamber through the second opening (15 2) to the exhaust opening (13 o). - a ventilation chamber, containing the fan; - a humidifier, connected to the ventilation chamber, and intended to humidify the air blown in by the fan, the humidifier having a reservoir intended to accommodate water; the humidifier having: - a connecting chamber, adjacent to the ventilation chamber, and comprising: • an intake opening, leading out of the ventilation chamber; • an exhaust opening (13 o), leading into an exhaust channel, the exhaust channel being configured to be attached to the duct; - a humidification chamber, having the water reservoir; - a first opening (15 1) and a second opening (15 2), separate from one another, formed between the connecting chamber and the humidification chamber; - a connecting chamber, adjacent to the ventilation chamber, and comprising: • an intake opening, leading out of the ventilation chamber; • an exhaust opening (13 o), leading into an exhaust channel, the exhaust channel being configured to be attached to the duct; • an intake opening, leading out of the ventilation chamber; • an exhaust opening (13 o), leading into an exhaust channel, the exhaust channel being configured to be attached to the duct; - a humidification chamber, having the water reservoir; - a first opening (15 1) and a second opening (15 2), separate from one another, formed between the connecting chamber and the humidification chamber; the device being characterized in that: - the connecting chamber extends between the humidification chamber and the ventilation chamber; - the device has a separating wall extending between the connecting chamber and the humidification chamber, the first opening (15 1) and the second opening (15 2) being made in the separating wall, the separating wall being arranged such that: • the humidification chamber extends between the bottom and the separating wall; • the connecting chamber extends between the separating wall and the ventilation chamber. - the connecting chamber defines a first channel (16 1) between the intake opening and the first opening, and also a second channel (16 2) between the second opening and the exhaust opening, such that: - the first channel is arranged to direct air from the ventilation chamber through the intake opening to the humidification chamber, through the first opening (15 1); - the second channel is arranged to direct air from the humidification chamber through the second opening (15 2) to the exhaust opening (13 o). - the connecting chamber extends between the humidification chamber and the ventilation chamber; - the device has a separating wall extending between the connecting chamber and the humidification chamber, the first opening (15 1) and the second opening (15 2) being made in the separating wall, the separating wall being arranged such that: • the humidification chamber extends between the bottom and the separating wall; • the connecting chamber extends between the separating wall and the ventilation chamber. • the humidification chamber extends between the bottom and the separating wall; • the connecting chamber extends between the separating wall and the ventilation chamber. - the connecting chamber defines a first channel (16 1) between the intake opening and the first opening, and also a second channel (16 2) between the second opening and the exhaust opening, such that: - the first channel is arranged to direct air from the ventilation chamber through the intake opening to the humidification chamber, through the first opening (15 1); - the second channel is arranged to direct air from the humidification chamber through the second opening (15 2) to the exhaust opening (13 o).