EXHIBIT 32.1

                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

      In connection with the Annual Report of Celerity Systems, Inc. (the
"Company") on Form 10-K for the year ended December 31, 2004 as filed with the
Securities and Exchange Commission on the date hereof (the "Report"), each of
the undersigned, in the capacities and on the dates indicated below, hereby
certifies pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906
of the Sarbanes-Oxley Act of 2002, that to his knowledge:

      1. The Report fully complies with the requirements of Section 13(a) or
15(d) of the Securities Exchange Act of 1934; and

      2. The information contained in the Report fairly presents, in all
material respects, the financial condition and results of operation of Celerity.

Dated:   April 11, 2005               By: /s/ Robert B. Legnosky
                                          ----------------------
                                              Robert B. Legnosky
                                              President, Chief Executive Officer
                                              and Chairman of the Board
                                              Interim Chief Financial Officer