9 CFR § 590.546 - Albumen flake process drying facilities.
(a) Drying facilities shall be constructed in such a manner as will allow thorough cleaning and be equipped with approved intake filters.
(b) The intake air source shall be free from foul odors, dust, and dirt.
(c) Premix-type burners, if used, shall be equipped with approved air filters at blower intake.
(d) Fermentation tanks, drying pans, trays or belts, scrapers, curing racks, and equipment used for pulverizing pan dried albumen shall be constructed of approved materials in such a manner as will permit thorough cleaning.
(e) Sifting screens shall be constructed of approved materials in such a manner as will permit thorough cleaning and be in accordance with the specification for the type of albumen produced.