EX-99.C2 7 ex-99_c2.txt CONSENT OF EVALUATOR First Trust Advisors L.P. 1001 Warrenville Road Lisle, Illinois 60532 April 9, 2008 First Trust Portfolios L.P. 1001 Warrenville Road Lisle, IL 60532 Re: FT 1685 Gentlemen: We have examined the Registration Statement File No. 333- 149588 for the above captioned fund. We hereby consent to the use in the Registration Statement of the references to First Trust Advisors L.P. as evaluator. You are hereby authorized to file a copy of this letter with the Securities and Exchange Commission. Sincerely, First Trust Advisors L.P. Jason T. Henry Senior Vice President