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Beside this, what does class 1 or 2 chimney mean?

A conventional flue but is only 5 inches in diameter. The range of gas fires that can be fitted to a class 2 flue is slightly reduced to that of a Class 1 flue. Pre-cast flue. Usually found in more recently built properties. The pre-cast flue is made from blocks, which fit within the cavity of an outside wall.

Furthermore, what is a Class 1 flue liner? Stainless steel class 1 chimney liner is a flexible twin-skinned liner which is also known as 'Quattro'. This type of chimney liner has been designed for people with chimneys that have failed a chimney inspection by a trained individual or if the draw on the chinmey is not performing as efficiently as it should.

Considering this, what is a Class A chimney?

Class A chimney pipe has many names, often referred to as double-wall chimney pipe, triple-wall chimney pipe, all-fuel pipe, or insulated chimney pipe. Class A pipe is used to vent high-temperature exhaust released from wood, coal, and oil-burning appliances such as fireplaces, stoves, boilers, and furnaces.

What is a prefabricated flue?

Often a feature in new houses, precast flues are made up of rectangular hollow concrete or clay blocks that travel vertically up through the cavity wall of your property, eventually ending up as a small ridge vent on your roof. Similar to prefabricated flues, precast flues are usually built into a flat wall.