FOR:  QUESTAIR TECHNOLOGIES INC.

TSX, AIM SYMBOL:  QAR

June 5, 2007

QuestAir Included in PROFIT 100 Ranking of Canada's Fastest-Growing Companies

VANCOUVER, BRITISH COLUMBIA--(CCNMatthews - June 5, 2007) - QuestAir Technologies Inc.
(TSX:QAR)(AIM:QAR) announced today that it has been included in the 19th annual PROFIT 100 ranking
of Canada's Fastest-Growing Companies, published by PROFIT: Your Guide to Business Success
magazine.

Jonathan Wilkinson, QuestAir President and CEO, said this is the third year that QuestAir has been
ranked in the Profit 100 list of fastest growing companies in Canada. "This award recognizes the
hard work and dedication of all our employees in developing and commercializing our proprietary
gas purification products over the past five years."

Ranking Canada's Fastest-Growing Companies by five-year revenue growth, the PROFIT 100 profiles
the country's most successful growth companies. Published in the June issue of PROFIT and online
at PROFITguide.com, the PROFIT 100 is Canada's largest annual celebration of entrepreneurial
achievement.

About QuestAir Technologies Inc.

QuestAir Technologies Inc. is a developer and supplier of proprietary gas purification systems for
several large international markets, including existing markets such as oil refining, biogas
production and natural gas processing, and emerging markets such as fuel cell power plants and
fuel cell vehicle refuelling stations. The Company has joint development agreements with Exxon
Mobil Research and Engineering Company and Shell Hydrogen, and a collaboration with FuelCell
Energy. QuestAir is based in Burnaby, British Columbia and its shares trade on the AIM Market of
the London Stock Exchange Plc. and on the Toronto Stock Exchange under the symbol "QAR".

About PROFIT Magazine

PROFIT: Your Guide to Business Success, offers news, strategies, tips, interviews and other
resources to entrepreneurs leading Canada's fastest-growing companies. Each year PROFIT - which
currently reaches more than 370,000 readers nationally - hosts a number of events that bring
together business leaders in the fast-growth segment and champions the interests of those leaders.
PROFIT was founded in April 1982 as Canada's first national magazine geared to entrepreneurs.
Visit PROFITguide.com.

Forward-Looking Statements

Certain statements in this press release may constitute "forward-looking" statements which involve
known and unknown risks, uncertainties and other factors which may cause the actual results,
performance or achievements of the Company, or industry results, to be materially different from
any future results, performance or achievements expressed or implied by such forward-looking
statements. When used in this press release, such statements use such words as "anticipate",
"believe", "plan", "estimate", "expect", "intend", "may", "will" and other similar terminology.
These statements reflect current expectations regarding future events and operating performance
and speak only as of the date of this press release. Forward-looking sstatements involve
significan risks and uncertainties, should not be read as guarantees of future performance or
results, and will not necessarily be accurate indications of whether or not such results will be
achieved. A number of factors could cause actual results to differ materially from the results
discussed in the forward-looking statements.



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FOR FURTHER INFORMATION PLEASE CONTACT:

QuestAir Technologies Inc.
Sherry Tryssenaar
Chief Financial Officer
(604) 453-6902
Email: tryssenaar@questairinc.com
Website: www.questairinc.com

OR

Buchanan Communications
Charles Ryland / Ben Willey
UK media contact
+44 (0) 20 7466 5000

OR

Karyo Edelman
Glen Edwards
Canadian media contact
(604) 623-3007

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