What is this "hot water coil"? Is it heating water? Is it using hot water to heat air? Is something causing it to freeze?
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I don't think there is anything illegal about a building owner/manager changing their own filters. Sell them a maintenance contract that includes the filter changes.
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As for which micron gauge is the best, the Bluvac hands down. With the leak rate indicator you can tell exactly what is happening inside the system. It is very sensitive and w...
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