EXHIBIT 5.1
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October 17, 2001

Celerity Systems, Inc.
122 Perimeter Park Drive
Knoxville, Tennessee 37922

RE:  CELERITY SYSTEMS, INC. (THE "CORPORATION")
     REGISTRATION STATEMENT ON FORM SB-2 (THE "REGISTRATION STATEMENT")

Gentlemen:

We have acted as counsel to the Corporation in connection with the preparation
of the Registration Statement filed with the Securities and Exchange Commission
pursuant to the Securities Act of 1933, as amended (the "1933 Act"), relating to
the proposed public offering of up to 228,440,611 shares of the Corporation's
Common Stock, par value $0.0001 per share (the "Common Stock").

We are furnishing this opinion to you in accordance with Item 601(b)(5) of
Regulation S-B promulgated under the 1933 Act for filing as Exhibit 5.1 to the
Registration Statement.

We are familiar with the Registration Statement, and we have examined the
Corporation's Articles of Incorporation, as amended to date, the Corporation's
Bylaws, as amended to date, and minutes and resolutions of the Corporation's
Board of Directors and shareholders. We have also examined such other documents,
certificates, instruments and corporate records, and such statutes, decisions
and questions of law as we have deemed necessary or appropriate for the purpose
of this opinion.

Based upon the foregoing, we are of the opinion that the shares of Common Stock
to be sold by the Selling Stockholders (as defined in the Registration
Statement) to the public, when issued and sold in the manner described in the
Registration Statement (as amended), will be validly issued, fully paid and
non-assessable.

We hereby consent to the filing of this opinion as an Exhibit to the
Registration Statement and to the use of our name in the Prospectus constituting
a part thereof in connection with the matters referred to under the caption
"Legal Matters."

Very truly yours,

KIRKPATRICK & LOCKHART LLP