Patent ID: 8800497

Claim:
A method for separating particles comprising down particles from air, the method comprising: (a) supplying air from the environment to a substantially closed duct; (b) introducing the air from the substantially closed duct to a substantially closed compartment comprising chicks younger than 7 days, wherein the substantially closed duct and the substantially closed compartment form a substantially closed circuit; (c) introducing the air from the substantially closed circuit to an inlet of a cyclone separator, wherein the cyclone separator comprises a first outlet which ends outside the substantially closed duct for directly discharging air into the environment, and a second outlet which ends inside the substantially closed duct; (d) returning a portion of the air to the substantially closed duct through the second outlet of the cyclone separator and circulating the air through the substantially closed compartment; and (e) discharging a portion of the air directly from the cyclone separator to the environment through the first outlet.