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Fogged Mirror

Hello all, I'm steadily getting a handle on how my steam system functions. For curiosity I held a small mirror about an inch above the rad air vents on my second floor rads and found moisture would form on the mirror as it vented. Also, there seems to be a slight "congested" sound coming from the vent at the same time.
Any thoughts???
Thank you
Any thoughts???
Thank you
0
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Comments
Is the boiler water clean, and oil free?
Is the supply piping proper?--NBC
Keep the pressure set where it should be, the boiler clean, the radiators pitched correctly and if a vent has obvious issue, you probably won't need a mirror to find it.