The frequency at which chimneys should be swept can only ever be a rough approximation because so many factors can affect how quickly obstructions can build up.

The single most important factor of all however is the type of fuel you are burning, as some tend to burn much cleaner than others.

That said, it is highly recommended to have your chimney swept at least once  a year

 

Cleaning should be done as necessary — normally when there’s a minimum 1/8-inch of deposit in the chimney. An annual inspection will determine if any sweeping or repairs are needed.

In some cases, it’s necessary to sweep more than once a year, especially if the operator, the fuel or the venting system are not properly matched.