Day 101: Noises Part 1

The Prompt: Describe a heater turning on.  What does it sound like?

I am describing a standing fan because we do not have a heater in the house.

The first thing you hear is a tiny click sound as the button scrapes as the switch inside to turn the fan on.  Then, the motor starts to whirl up, just like an airplane's propeller starts rotating rapidly as it warms up to fly down the runway for takeoff.  The fan's motor is somewhat loud.  It's only obnoxious when you hear it while you are trying to concentrate.  It doesn't hit against something but constantly whirs, like a hummingbird's wings.  The motor modulates in volume, creeping up in volume and then falling back down, all in a space of a few seconds per cycle.