What Makes Radiators Bang So Loudly?

If you hear a loud bang in the middle of the night, it is probably your radiator. But how does a hollow hunk of metal make such a loud noise?

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Sources:
http://www.reclaimedradiators.co.uk/hx.html
http://www.popularmechanics.com/home/interior-projects/how-to/a9680/how-to-shut-up-that-noisy-steam-radiator-16131140/
http://www.nytimes.com/1981/03/01/nyregion/home-clinic-knocking-the-noise-out-of-radiators.html

Noisy Radiator? Here’s How to Shush It




http://www.bonfe.com/blog/how-to-stop-noisy-heating-pipes-banging/
http://www.startribune.com/fixit-many-factors-cause-gurgling-radiator/14403101/
https://www.plumbcare.com/blog/2016/09/6-unusual-central-heating-noises-what-they-could-mean

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