INVESTOR PRESENTATION May 2010

1. A Global Leader in Integrated Clean Air Solutions for Industry INVESTOR PRESENTATIONMay 2010

2. Safe Harbor Statement In addition to historical information, this presentation contains forward-looking statements. These statements relate to future events or our future financial performance. These statements are only predictions and involve known and unknown risks, uncertainties, and other factors. The following factors, among others, could cause our actual results and performance to differ materially from the results and performance projected in, or implied by, the forward-looking statements: our dependence on fixed price contracts and the risks associated therewith, including actual costs exceeding our estimates and our method of accounting for contract revenue; our history of losses and possibility of further losses; the effect of poor operating results on our company; fluctuations in operating results from period to period due to seasonality of our business; the effect of growth on our infrastructure, resources, and existing sales; our ability to expand our operations in both new and existing markets; the potential for contract delay or cancellation; the potential for fluctuations in prices for manufactured components and raw materials; our ability to raise capital and the availability of capital resources; our ability to fully utilize and retain executives; the impact of federal, state, or local government regulations; labor shortages or increases in labor costs; economic and political conditions generally; and the effect of competition in the air pollution control and industrial ventilation industry. We assume no obligation to publicly update or revise these forward-looking statements for any reason, or to update the reasons actual results could differ materially from those anticipated in, or implied by, these forward-looking statements, even if new information becomes available in the future. Although the Company believes the expectations reflected in such forward looking statements are reasonable, it can give no assurance that such expectations will prove to be correct.

3. Company Overview • Company: CECO Environmental Corp. • Exchange / Ticker: NasdaqGM / CECE • Headquarters: Cincinnati, Ohio • Share Price (4/29/10): $5.15 • 52-Week High / Low: $5.64 / $2.63 • Shares O/S Basic/Diluted: 14.4 million/17.8 million • Insider Ownership: 27.9% • Market Cap: $74.2 million • Enterprise Value: $90.4 million • 2009 Revenue: $139 million • 2009 Adjusted EBITDA: $3.8 million • Backlog (12/31/09): $66.5 million

4. Company Leadership Phillip DeZwirek - Chairman • Founder and Chairman of CECO Environmental Corp. • Chairman of API Technologies Corp. • Graduate attorney, Graduate School of Business – University of California Jeff Lang - Chief Executive Officer • 30 years of industrial and energy-related operating and executive management experience  • Former Executive Vice President, Operating Officer at McJunkin Red Man Corp., a Goldman Sachs portfolio company with $4.5 billion in annual sales • 25 years at Ingersoll Rand, including leading their Industrial Air Solutions sales, service and operations for North America • Bachelors degree – Ohio University, MBA – Averett University Dennis W. Blazer - CFO and Vice President – Finance and Administration • 35 years of financial management experience • Former CFO of Interlott Technologies – AMEX listed under symbol ILI • Certified Public Accountant • Bachelors degree – Ohio University

5. Our Vision • To become a world-class company that produces exceptional value for our customers, shareholders, employees and communities by delivering: • Significant Growth • Implementing profitable ways to grow globally with premier solutions.  • Product and Service Excellence • Creating customer successes and building customer loyalty. • Operational Excellence • Running smart, lean, best-in-class processes. • Employee Development • Investing in the training and development of our employees. • Global Market Coverage • Providing worldwide sales and manufacturing resources. • Safety Leadership • Ensuring employee safety with world-class safety practices.

6. Our Focus • We make the air cleaner for industry all over the world. Our systems, equipment and services: • Remove airborne contaminants within industrial facilities • Clean the air exhausted from those industrial facilities • CECO will be positioned well at the intersection of these critical global growth needs

7. What We Offer • SERVICES • Industrial Ventilation Engineering • Pressure Vessel & • Custom Fabrication • Energy Management • Stack Emission Testing • Electrostatic Precipitator Rebuilds • Precipitator Controls and Parts • EQUIPMENT • Cyclones • Thermal and Catalytic • Oxidizers • Pulse Jet Baghouses • Scrubbers • Dampers & • Expansion Joints • Electrostatic Precipitators A GLOBAL LEADER IN CLEAN AIR SOLUTIONS

8. Markets Served

9. Markets Served - continued

10. Typical Installations Regenerative Thermal Oxidizer Alternative Fuels Market – Ethanol Severe Service Cyclone Petrochemical Market FCC Cyclones Refinery Market Fiber Bed Filtration Chemical Process Market Dampers Power and Utility Market Pulse Jet Baghouse Cement and Minerals Market

11. Energy Industry Solutions Power Generation Compliance

12. Diversified Customer Base

13. Backlog by Industry 2009 - $66.5 Million

14. Global Bookings by Industry 2009 - $142 Million Other 18% Power 34% Steel 4% Mfg./Misc. 5% Food 6% Chemical 6% Refining 13% Automotive 6% Sheet Metal Contractors 9%

15. Sales Facilities Future Agents

16. Demand Driver: US Regulation • EPAhas mandated industrial air quality standards by requiring MACT (Maximum Achievable Control Technology) for general air pollution as well as for NOx, SO2 and mercury reduction. • OSHA has established TLV (Threshold Limit Values) for more than 1,000 industrial contaminants. • DOE promotes new technology growth in biomass and gasification through its Financial Institution Partnership Program. • States continually promulgate new Renewable Energy Standards (RES) such as 12 to 15% technologies for electric companies. • Enforcement of these standards is expected to increase.

17. Demand Driver: Global Regulation • Clean Air For Europe (CAFÉ) Policy Development for Air Pollution Control in Europe • Eastern Europe Caucasus and Central Asia for Pollution Control (EECCA) Joint Policy Development • Ministry of Environmental Protection – People’s Republic of China China has targeted 50% or greater reduction in SO2 and NOx emissions

18. Demand Driver: Energy Worldwide net electrical demand is projected to double by 2030. Projected GW 20-Year Growth Sources: DOE’s Energy Information Agency ( EIA) and World Analysis & Forecast, McIlvaine Company

19. Demand Driver: Energy-Alternative Fuels • Biomass • Energy Policy Act of 2005 mandates 7.5 billion gallons of renewable fuels by 2012 • Energy Independence and Security Act of 2007 expands mandate for US-grown biofuels to 36 billion gallons in 2022 • Ethanol from corn capped at 15 billion gallons; rest must come from non-food cellulosic biomass • Gasification • World gasification capacity is expected to grow more than 70% by 2015 • 80+% of the growth will occur in China and India • US regulations will push demand for gasification

20. Our Strategy • Grow our core businesses – both domestically and globally. • Invest in strategic bolt-on acquisitions – globally. • Continue expanding in China and India. • Pursue evolving markets such as renewable fuels, gasification, and biomass. • Reshape our business to less cyclical end markets. • Achieve operational excellence. Lean, Best and Smart.

21. Competitive Advantages • The leading full-service provider of air pollution control and industrial ventilation products and services • Strong brand recognition and loyalty • Long-standing customer relationships • Technology leadership • End-to-end solutions; integrated systems capability • Globally focused

22. Acquisition Criteria • Must fit our core business of making the environment cleaner, safer and better • Must be accretive to near-term earnings • Must expand our global footprint and/or expand our product and service offerings • Must create opportunity for operating and administrative efficiencies • Must be willing to include an earn-out provision for shared risk • Must have a proven management team

23. A Global Leader in Integrated Clean Air Solutions for Industry FINANCIAL INFORMATION

24. Revenues $ in 000’s $45,000 Large one time project $5,000 $212,890 $190,953

25. Increasing Gross Margins Improvement due to diversification of offerings and expanded customer base

26. Operating Income $ in 000’s * * Excludes goodwill impairment charges

27. Adjusted EBITDA* $ in 000’s * See appendix for reconciliation to GAAP net income

28. Strong Cash Flow & Debt Reduction $ in 000’s $45,000

29. Q-1 2010 Results - in 000’s

30. Reconciliation

31. Our Vision • To become a world-class company that produces exceptional value for our customers, shareholders, employees and communities by delivering: • Significant Growth • Implementing profitable ways to grow globally with premier solutions.  • Product and Service Excellence • Creating customer successes and building customer loyalty. • Operational Excellence • Running smart, lean, best-in-class processes. • Employee Development • Investing in the training and development of our employees. • Global Market Coverage • Providing worldwide sales and manufacturing resources. • Safety Leadership • Ensuring employee safety with world-class safety practices.

32. A Global Leader in Integrated Clean Air Solutions for Industry Contact Information: • Jeff Lang – Chief Executive Officer • Phone: 513-458-2600 • Email: jeff.lang@cecoenviro.com • Dennis Blazer – Chief Financial Officer • Phone: 513-458-2676 • Email: dblazer@cecoenviro.com

33. A Global Leader in Integrated Clean Air Solutions for Industry Thank You!