Our customer has purchased four direct fired MUAs for a bakery building, constant speed each 50,000 CFM. There are many exhaust fans in the building mostly integrated with process equipment. B149.1 requires these MUAs to be interlocked with exhaust fans. Each MUA cannot be interlocked with more than one fan. In BC, MUA can be interlock with a fan that represents the 1/20 of total exhaust rate, is there a similar regulation in Ontario?
How can I operate these units and meet code requirements.
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