Model or a fan. Model of a fan, working as a double bellows. In the large rectangular compartment, a shelf, which is attached to the short front with hinges at a half-front, is moved to a lever up and down; The two halves in which the compartment are distributed by the shelf are hereby reduced and enlarged. Air is launched by two square valves on the front, consisting of simple valves with sea leather coated, an upstairs and a downstairs hinges of the shelf. Due to similar valves, the air is drained to a small compartment before, where the air flow is directed to a single outlet in a square ventilation pad, which leads upwards; This tube can be released.