Exhibit 99A

                                CERTIFICATION OF
               CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER
                                   PURSUANT TO
                  SECTION 302 OF THE SARBANES OXLEY ACT OF 2002

I, Moreal Chu, certify that:

1. I have reviewed this quarterly report on Form 10-QSB of Visual Frontier, Inc.
(formerly Air Test Technology, Inc.).;

2. Based on my knowledge, this quarterly report does not contain any untrue
statement of a material fact or omit to state a material fact necessary to make
the statements made, in light of the circumstances under which such statements
were made, not misleading with respect to the period covered by this quarterly
report;

3. Based on my knowledge, the financial statements, and other financial
information included in this quarterly report, fairly present in all material
respects the financial condition, results of operations and cash flows of the
registrant as of, and for, the periods presented in this quarterly report;

4. The registrant's other certifying officers and I are responsible for
establishing and maintaining disclosure controls and procedures (as defined in
Exchange Act Rules 13a-14 and 15d-14) for the registrant and have:

       a) designed such disclosure controls and procedures to ensure that
       material information relating to the registrant, including its
       consolidated subsidiaries, is made known to us by others within those
       entities, particularly during the period in which this quarterly report
       is being prepared;

       b) evaluated the effectiveness of the registrant's disclosure controls
       and procedures as of a date within 90 days prior to the filing date of
       this quarterly report (the "Evaluation Date"); and

       c) presented in this quarterly report our conclusions about the
       effectiveness of the disclosure controls and procedures based on our
       evaluation as of the Evaluation Date;

5. The registrant's other certifying officers and I have disclosed, based on our
most recent evaluation, to the registrant's auditors and the audit committee of
registrant's board of directors (or persons performing the equivalent
functions):

       a) all significant deficiencies in the design or operation of internal
       controls which could adversely affect the registrant's ability to record,
       process, summarize and report financial data and have identified for the
       registrant's auditors any material weaknesses in internal controls; and

       b) any fraud, whether or not material, that involves management or other
       employees who have a significant role in the registrant's internal
       controls; and

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6. The registrant's other certifying officers and I have indicated in this
quarterly report whether or not there were significant changes in internal
controls or in other factors that could significantly affect internal controls
subsequent to the date of our most recent evaluation, including any corrective
actions with regard to significant deficiencies and material weaknesses.
                                    VISUAL FRONTIER, INC.


Date: May 29, 2003               By: /s/ Moreal Chu
                                        ------------------------------------
                                 Name: Moreal Chu
                                 Title:   President and General Manager
                                 (equivalent  to  Chief Executive Officer and
                                 Chief Financial Officer)


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