9 CFR § 590.547 - Albumen flake process drying operations.
(a) The fermentation, drying, and curing rooms shall be kept in a dust-free clean condition and free of flies, insects, and rodents.
(b) Drying units, racks, and trucks shall be kept in a clean and sanitary condition.
(c) Drying pans, trays, belts, scrapers, or curing racks, if used, shall be kept in a clean condition.
(d) Oils and waxes used in oiling drying pans or trays shall be of edible quality.
(e) Equipment used for pulverizing or sifting dried albumen shall be kept in a clean condition.