QuestAir to Supply Hydrogen Purifier for Hydrogen Plant at Montana Refinery

FOR: QUESTAIR TECHNOLOGIES INC.

TSX, AIM SYMBOL: QAR

September 18, 2007

VANCOUVER, BRITISH COLUMBIA--(Marketwire - Sept. 18, 2007) - QuestAir Technologies Inc.
(TSX:QAR)(AIM:QAR) announced today that it has received an order valued at approximately CDN $1.0
million for a H-3200 hydrogen purifier, for use in a new hydrogen plant at an oil refinery in
Montana. The order was placed by Hydro-Chem, a leading global supplier of industrial hydrogen
plants, and a division of Linde BOC Process Plants LLC.

Jonathan Wilkinson, President and CEO of QuestAir, said that the H-3200 pressure swing adsorption
("PSA") system will be included in a new hydrogen plant that Hydro-Chem is supplying to Montana
Refining Company. Product hydrogen from the plant will be used to increase oil refining capacity
at the refinery site.

"Demand for hydrogen in the oil refining industry continues to be strong, driven by capacity
expansions such as this project at Montana Refining, as well as regulations mandating low-sulphur
transportation fuels."

"This will be QuestAir's largest capacity single skid hydrogen PSA. We have had great commercial
success with the H-3200 product platform since its launch in 2003, and we now have an installed
base of more than 40 smaller-capacity H-3200 PSA's around the world."

"We have now expanded the capacity of the H-3200 design, offering the benefits of the H-3200's
advanced 9 bed PSA cycle and compact skid-mounted design to manufacturers of hydrogen plants with
capacities up to 15,000 cubic meters per hour," Wilkinson said.

Raju Natarajan, Hydro-Chem's President, said, "QuestAir continues to lead the hydrogen PSA market
in product innovation. With the capacity expansion of the H-3200 PSA, QuestAir's now offers a
reduction in life-cycle costs and increased reliability to Hydro-Chem's medium-capacity hydrogen
plants."

About QuestAir H-3200

QuestAir's H-3200 purifies hydrogen-containing gas streams to high purity hydrogen for use in
industrial processes, on-site hydrogen plants and hydrogen fueling stations. The H-3200's
optimized Pressure Swing Adsorption ("PSA") process and proprietary rotary valve technology
deliver higher efficiency than conventional PSA systems in a more compact, cost effective package.
Since the product launch in 2003, QuestAir has sold more than 45 H-3200 systems to customers in
Europe, Japan and North America.

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 refueling stations. 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 Hydro-Chem

Hydro-Chem specializes in the design, engineering and construction of modular hydrogen plants.
Hydro-Chem has supplied over 140 hydrogen plants to key clients in the food, steel, glass and
petrochemical industries since 1975. Hydro-Chem is a division of Linde BOC Process Plants LLC.

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 statements involve
significant 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

Buchanan Communications
Charles Ryland
UK Media Contact
+44 (0) 20 7466 5000

Buchanan Communications
Ben Willey
UK Media Contact
+44 (0) 20 7466 5000

Karyo Communications
Stephen Burega
Canadian Media Contact
(604) 623-3007

Canaccord Adams
Robert Finlay
+44 207 050 6500

Canaccord Adams
Erin Needra
+44 207 050 6500

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QuestAir Technologies Inc.

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