Did you know that your steam heat radiator was designed as-is in response to the flu pandemic of 1918? Steam heat technology had existed for quite some time, but it wasn’t until the pandemic of 1918 that the use of a radiator became wide-spread. The idea was when you had the radiator on, and the windows open it would create the perfect temperature. Yes, that’s right. When your radiator is on, you are intended to have your window open! This would cause what was deemed appropriate air circulation, and temperature in order to keep you from getting sick.