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Sharing this link to COSA…a great resource for anyone working in the HVACR industry and/or if you are just looking to learn more about testing and monitoring of CO
https://cosafety.blogspot.com/?fbclid=IwAR32Rde0QkiqCCn5uryJQu3hdkPy3kYQQ6R6oY70StPqgJWHxL4tkr7tnic
