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Ideally, your chimney cap should be at least 8 inches above the top of the flue, though it's better if it's even higher. You want it to sit that high because it won't affect the chimney's draft, which pulls the smoke up and out of your chimney and away from your home.

Your chimney comes with dampers, which are similar to air vents. Dampers are metal plates that allow hot air and smoke to flow from the fireplace up your chimney and out of your home. When you close the damper, it prevents cool air from getting into your home. This is why you’ll want to check to make sure your damper is open before starting your fireplace and you want to ensure it’s closed after the fire goes out. You can open and close them via an external knob, pull chain, or lever. 

In most cases, you should have your chimney cleaned and inspected once a year. Since different materials and conditions can cause creosote to build up at different rates, there might be times when you need to sweep your chimney more frequently. An annual inspection will help you determine if more frequent cleaning is necessary.

A fireplace that doesn’t require a chimney is simply called a chimneyless fireplace. Don’t confuse these with ventless fireplaces, however. There are some fireplaces that require ventilation via a system of pipes, not a chimney. More specifically, the fireplace in question will likely be called by its name, such as electric, ethanol, or balanced flue.