What is a Grade A Fireplace Smoke chimney flue pipe?

What is a Grade A Fireplace Smoke chimney flue pipe?

A-grade fireplace chimney flue pipe have many names, usually called double-walled pipes, three-layer fireplace pipes, full-fuel pipes or insulated pipes, etc. Class A pipes are used to discharge high-temperature exhaust gases from wood, coal, and oil-fired appliances such as fireplaces, stoves, boilers, and furnaces. Not every fireplace ventilation system requires Class A ducting, but Class A flue ducts are an absolute must for all types of wood-burning fireplaces.

Class A fireplace pipes must be UL listed and different brands of Class A fireplace pipes should not be mixed and matched in one chimney system. Different brands of pipes have different designs, and the chimney system of the fireplace must be used as a complete system from beginning to end. If you're looking to expand or redesign your current fireplace chimney system, you'll want to know the make and model of your existing Class A fireplace chimney pipes, and purchase the same type of pipe if possible.

There are two types of Class A fireplace pipes:

Solid Fireplace Smoke Pipes - These pipes have a small inner diameter (usually ranging from 12.7 cm to 20.32 cm), have some insulation, and can be either double-walled or triple-walled. These pipes contain fiberglass or ceramic insulation materials to keep the temperature of the outermost layer in contact with the outside world low. The exposed part of the fireplace smoke pipe must be kept 5-10 cm away from combustibles.

Air-cooled fireplace smoke pipes—These pipes have a large inner diameter (usually from 20.32 cm to 60.96 cm) and are not insulated. As the name suggests, these pipes rely on internally circulated air to keep the outer walls cool, and like a solid fireplace smoke pipe, it must maintain a 2.5-5 cm clearance from combustibles.

When working with Class A fireplace flue pipes, it is important to plan or lay out the ventilation ducts wisely to minimize costs and maximize savings. Class A fireplace smoke pipes are usually manufactured with stainless steel or galvanized (or galvanized) outer walls. When running Class A fireplace pipes in masonry chimneys, attics, it is economically sensible to use galvanized pipe. If possible, it is highly recommended to install the chimney inside the space. Exposing your fireplace chimney system to the outdoors poses the risk of "cold furnace syndrome," which hinders ventilation and produces more creosote.