Exhibit 99.1

CECO Environmental Corp. Reports Second Quarter and Six Months 2016 Results;

Achieved Record Revenue, Operating Income, and Net Cash Provided by Operating Activities

Second Quarter 2016 Highlights*

CINCINNATI, Ohio, August 9, 2016 — CECO Environmental Corp. (Nasdaq: CECE), a leading global energy, environmental, and industrial technology company, today reported its financial results for the second quarter of 2016.

CECO’s Chief Executive Officer Jeff Lang stated, “I am encouraged with our operational progress, especially our bookings of $108.8 million in the quarter and $228.9 million year-to-date, representing organic bookings growth of 16.0% and 4.5%, respectively. During the quarter, we delivered sequential operating margin expansion and record net cash provided by operating activities, allowing us to significantly pay down debt ahead of schedule. We have fully completed the integration of our Peerless acquisition and have exceeded the promised operational and overall business synergies, more than one year ahead of schedule, with $18.0 million in total operating cost-out synergies. In addition, our continued focus on organic sales, recurring revenue growth, and working capital initiatives enabled debt repayment and a reduction in our leverage ratios.”

“While we anticipate some macroeconomic headwinds in a few markets and regions for the remainder of the year, we are confident that the actions taken in 2015 and the first half of 2016, coupled with our diversity of end markets, geographies and revenue streams, provide a foundation to drive profitable growth through various cycles. The direction and core of our business is fundamentally strong, and we have the right team in place to deliver earnings growth, margin expansion and sales improvement into the future,” concluded Jeff Lang.

Revenue in the second quarter of 2016 was $112.3 million, up 29.1% from $87.0 million in the prior-year period. Recent acquisitions ⁽¹⁾ contributed $25.0 million of revenue in the second quarter of 2016.

Operating income was $8.6 million for the second quarter of 2016 (7.7% margin), compared with $4.5 million in the prior-year period (5.2% margin). Operating income on a non-GAAP basis was $13.0 million for the second quarter of 2016 (11.6% margin), compared with $12.3 million in the prior-year period (14.1% margin).

Net income was $4.0 million for the second quarter of 2016, compared with $2.1 million in the prior-year period. Net income on a non-GAAP basis was $7.3 million for the second quarter of 2016, compared with $8.5 million in the prior-year period.

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Net income per diluted share was $0.12 for the second quarter of 2016, compared with net income per diluted share of $0.08 in the prior-year period. Non-GAAP net income per diluted share was $0.21 for the second quarter of 2016, compared with $0.32 for the prior-year period.

Cash and cash equivalents were $56.6 million and bank debt was $152.5 million as of June 30, 2016, compared with $34.2 million and $177.3 million, respectively, as of December 31, 2015.

BACKLOG AND BOOKINGS

Total backlog at June 30, 2016 was $224.7 million compared with $211.2 million on December 31, 2015 and $140.6 million on June 30, 2015.

Bookings were $108.8 million for the second quarter of 2016, compared with $74.6 million in the prior year, an increase of 46%. Bookings were $228.9 for the first half of 2016 as compared with $168.5 for the prior-year period.

YEAR-TO-DATE RESULTS

Revenue in the first half of 2016 was $215.4 million, up 28.3% from $167.9 million in the prior-year period. Recent acquisitions⁽¹⁾ contributed $49.9 million of revenue in the first half of 2016.

Operating income was $14.4 million for the first half of 2016 (6.7% margin), compared with $7.5 million in the prior-year period (4.5% margin). Operating income on a non-GAAP basis was $23.9 million for the first half of 2016 (11.1% margin), compared with $19.8 million in the prior-year period (11.8% margin).

Net income was $7.1 million for the first half of 2016, compared with $2.3 million in the prior-year period. Net income on a non-GAAP basis was $13.4 million for the first half of 2016, compared with $14.2 million in the prior-year period.

Net income per diluted share was $0.21 for the first half of 2016, compared with $0.09 in the prior-year period. Non-GAAP net income per diluted share was $0.39 for the first half of 2016, compared with $0.53 in the prior-year period.

QUARTERLY DIVIDENDS

On August 8, 2016, CECO’s Board of Directors approved a quarterly dividend of $0.066 per share. The dividend will be paid on September 30, 2016 to all stockholders of record on close of business on September 16, 2016. CECO initiated a Dividend Reinvestment Plan (“DRIP”) in 2012 that provides for the voluntary reinvestment of dividends by its stockholders.

CONFERENCE CALL

A conference call is scheduled for today at 10:30AM ET to discuss the second quarter 2016 results. The conference call may be accessed by dialing +1.877.407.3982 (Toll-Free) in the U.S. and Canada or by dialing +1.201.493.6780 for international calls. A replay will be available from 1:30 p.m. ET on August 9 until August 23, 2016 at 11:59 p.m. ET. The replay may be accessed by dialing +1.877.870.5176 (Toll-Free) in the U.S. and Canada or by dialing +1.858.384.5517 for international calls and entering passcode 13639678.

The live webcast and slides can also be accessed at http://www.cecoenviro.com/investor-relations.

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CECO ENVIRONMENTAL CORP. AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

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CECO ENVIRONMENTAL CORP. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(unaudited)

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CECO ENVIRONMENTAL CORP. AND SUBSIDIARIES

RECONCILIATION OF GAAP TO NON-GAAP MEASURES

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ABOUT CECO ENVIRONMENTAL

CECO is a diversified global provider of leading engineered technologies to the energy, environmental, and industrial segments, targeting specific niche-focused end markets through an attractive asset-light business model, strategically balanced across the world. CECO targets its $5 billion+ of installed base, specifically to expand and grow a higher recurring revenue of aftermarket products and services. CECO’s well respected brands, technologies and solutions have been evolving for well over 50 years to become leading-edge technologies in specific niche global end markets, including natural gas turbine power, refinery & petrochemical engineered cyclones and mid-stream energy pipeline gas transmission. CECO is listed on Nasdaq under the ticker symbol “CECE.” For more information, please visit http://www.cecoenviro.com/

Contacts:

Ed Prajzner, Chief Financial Officer & Secretary

800.333.5475

eprajzer@cecoenviro.com

Tracy Krumme, Vice President of Investor Relations

513.458.2610

tkrumme@cecoenviro.com

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NOTE REGARDING NON-GAAP FINANCIAL MEASURES

CECO is providing the non-GAAP historical financial measures presented above as the Company believes that these figures are helpful in allowing individuals to better assess the ongoing nature of CECO’s core operations. A “non-GAAP financial measure” is a numerical measure of a company’s historical financial performance that excludes amounts that are included in the most directly comparable measure calculated and presented in the GAAP statement of operations.

Non-GAAP gross profit, non-GAAP operating income, non-GAAP net income, non-GAAP gross profit margin, non-GAAP operating margin, non-GAAP earnings per basic and diluted share and adjusted EBITDA, as we present them in the financial data included in this press release, have been adjusted to exclude the effects of expenses related to property, plant equipment valuation adjustments, acquisition and integration expense activities including retention, legal, accounting, banking, amortization and contingent earnout expenses, foreign currency re-measurement, intangible asset impairment, legal reserves, other nonrecurring or infrequent items and the associated tax benefit of these items. Management believes that these items are not necessarily indicative of the Company’s ongoing operations and their exclusion provides individuals with additional information to compare the Company’s results over multiple periods. Management utilizes this information to evaluate its ongoing financial performance. Our financial statements may continue to be affected by items similar to those excluded in the non-GAAP adjustments described above, and exclusion of these items from our non-GAAP financial measures should not be construed as an inference that all such costs are unusual or infrequent.

Non-GAAP gross profit, non-GAAP operating income, non-GAAP net income, non-GAAP gross profit margin, non-GAAP operating margin, non-GAAP earnings per basic and diluted shares and adjusted EBITDA are not calculated in accordance with GAAP, and should be considered supplemental to, and not as a substitute for, or superior to, financial measures calculated in accordance with GAAP. Non-GAAP financial measures have limitations in that they do not reflect all of the costs associated with the operations of our business as determined in accordance with GAAP. As a result, you should not consider these measures in isolation or as a substitute for analysis of CECO’s results as reported under GAAP.

In accordance with the requirements of Regulation G issued by the Securities and Exchange Commission, non-GAAP gross margin, non-GAAP operating income, non-GAAP net income, non-GAAP gross profit margin, non-GAAP operating margin, non-GAAP earnings per basic and diluted share and adjusted EBITDA, stated in the tables above present the most directly comparable GAAP financial measure and reconcile to the most directly comparable GAAP financial measures.

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SAFE HARBOR

Any statements contained in this press release other than statements of historical fact, including statements about management’s beliefs and expectations, are forward-looking statements and should be evaluated as such. These statements are made on the basis of management’s views and assumptions regarding future events and business performance. Words such as “estimate,” “believe,” “anticipate,” “expect,” “intend,” “plan,” “target,” “project,” “should,” “may,” “will” and similar expressions are intended to identify forward-looking statements. Forward-looking statements (including oral representations) involve risks and uncertainties that may cause actual results to differ materially from any future results, performance or achievements expressed or implied by such statements. These risks and uncertainties include, but are not limited to: our ability to successfully integrate acquired businesses and realize the synergies from acquisitions, including PMFG, as well as a number of factors related to our business including economic and financial market conditions generally and economic conditions in CECO’s service areas; dependence on fixed price contracts and the risks associated therewith, including actual costs exceeding estimates and method of accounting for contract revenue; fluctuations in operating results from period to period due to seasonality of the business; the effect of growth on CECO’s infrastructure, resources, and existing sales; the ability to expand operations in both new and existing markets; the potential for contract delay or cancellation; changes in or developments with respect to any litigation or investigation; the potential for fluctuations in prices for manufactured components and raw materials; the substantial amount of debt incurred in connection with our recent acquisitions and our ability to repay or refinance it or incur additional debt in the future; the impact of federal, state or local government regulations; economic and political conditions generally; and the effect of competition in the environmental, energy and fluid handling and filtration industries. These and other risks and uncertainties are discussed in more detail in CECO’s filings with the Securities and Exchange Commission, including our reports on Form 10-K and Form 10-Q. Many of these risks are beyond management’s ability to control or predict. Should one or more of these risks or uncertainties materialize, or should the assumptions prove incorrect, actual results may vary in material aspects from those currently anticipated. Investors are cautioned not to place undue reliance on such forward-looking statements as they speak only to our views as of the date the statement is made. All forward-looking statements attributable to CECO or persons acting on behalf of CECO are expressly qualified in their entirety by the cautionary statements and risk factors contained in this press release and CECO’s respective filings with the Securities and Exchange Commission. Furthermore, forward-looking statements speak only as of the date they are made. Except as required under the federal securities laws or the rules and regulations of the Securities and Exchange Commission, CECO undertakes no obligation to update or review any forward-looking statements, whether as a result of new information, future events or otherwise.

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