CECO Environmental Corp. operates as a provider of air pollution control products and services. CECO Group, Inc. (CECO Group) is a wholly owned subsidiary of the Company, which owns 100% of the stock of The Kirk & Blum Manufacturing Company (Kirk & Blum), approximately 94% of the common stock of CECO Filters, Inc. (Filters), 100% of the stock of CECO Abatement Systems, Inc. (CECO Abatement) and beneficially owns 100% of the stock of kbd/Technic, Inc (kbd/Technic).