Section 436-6-603 - Farm Product Security Interests (EFS statements)603.1 Mechanics of filing. EFS (Effective Financing Statements) are filed in the Filing office. 603.1.1 Duration. The duration is 5 years from date of filing.603.1.2 Mechanics of search. See search logic described in rule 503.2.436 Neb. Admin. Code, ch. 6, § 603