CECO Environmental Investor Presentation — May 2021

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1Forward -Looking Statements and Non -GAAP Information

This presentation contains forward -looking statements with predictions, projections and other statements about future events. Th ese statements are made on the basis of management’s

views and assumptions regarding future events and business performance. We use words such as “believe,” “expect,” “anticipate ,” “intends,” “estimate,” “forecast,” “project,” “will,” “plan,”

“should” and similar expressions to identify forward -looking statements. Forward -looking statements involve risks and uncertaint ies that may cause actual results to differ materially from these

forward -looking statements. Potential risks and uncertainties, among others, that could cause actual results to differ materiall y are discussed under “Part I –Item 1A. Risk Factors” of the

Company’s Annual Report on Form 10 -K for the fiscal year ended December 31, 2020 and include, but are not limited to: the sensitivity of our business to economic and financial market

conditions generally and economic conditions in CECO’s service areas; dependence on fixed price contracts and the risks assoc iated therewith, including actual costs exceeding estimates

and method of accounting for revenue; the effect of growth on CECO’s infrastructure, resources, and existing sales; the abili ty to expand operations in both new and existing markets; the

potential for contract delay or cancellation; liabilities arising from faulty services or products that could result in signi ficant professional or product liability, warranty, or other claims; changes in

or developments with respect to any litigation or investigation; failure to meet timely completion or performance standards t hatcould result in higher cost and reduced profits or, in some cases,

losses on projects; the potential for fluctuations in prices for manufactured components and raw materials, including as a re sult of tariffs and surcharges; the substantial amount of debt

incurred in connection with our strategic transactions and our ability to repay or refinance it or incur additional debt in t he future; the impact of federal, state or local government regulations;

economic and political conditions generally; our ability to successfully realize the expected benefits of our restructuring p rogram; our ability to successfully integrate acquired businesses and

realize the synergies from strategic transactions; unpredictability and severity of catastrophic events, including cyber secu rity threats, acts of terrorism or outbreak of war or hostilities or public

health crises, such as uncertainties regarding the extent and duration of impacts of matters associated with the novel corona virus (COVID -19), as well as management’s response to any of