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The agency responsible for certifying venting systems is ULC (Underwriters Laboratories of Canada). ULC is dedicated to establishing standards for safety and performance in Canada, and it specifically focuses on the evaluation and certification of ventilation and combustion products. This includes devices and materials used in gas appliances and systems, ensuring they meet safety regulations and performance criteria applicable within Canadian environments.

ULC's role is critical as it helps ensure that venting systems are safe for consumers and that they operate efficiently while adhering to Canadian codes and standards. This certification is essential for manufacturers and installers, as it provides assurance that the venting systems will function as intended and minimize risks associated with gas appliances.

In contrast, ANSI (American National Standards Institute) develops voluntary consensus standards for products, but it does not certify products directly. UL (Underwriters Laboratories) is an American organization that tests and certifies products; however, it does not focus specifically on the Canadian market or standards like ULC does. ISO (International Organization for Standardization) is involved in international standards development but does not engage in product certification in the same manner as ULC.