These are designed for testing a flue or chimney for any inconsistances. They release a dense smoke to draw attention to any potential issues. They are sold in various colours and can be either matches or cartridges.
Pack of 10
Smoke Colour: Grey
Burn time Grading: 9
Technical specification
Waist Sizead62ci4gsTypeSmoke PelletManufacturer Model No333009Brand NameArctic Hayes