The choice of the flue outlet pipe of a wood-burning stove or fireplace is not a matter that should be taken lightly. Although not in all cases, it is necessary to be demanding in terms of the quality of these; some examples should not be spared.

According to Stainless Steel Flanges Manufacturer, we should consider these things.

Tube Assembly Inside The Housing

Ideally, each home would have a cannon-like pre-installation inside the house with a roof flue. In this installation, you can use a simple A234 WPB Elbow, since this is isolated by the house and the chimney cannon, which will prevent us from generating condensation. The different simple tubes that we can find are:

Simple stainless steel tube

It is convenient to clarify that not any stainless steel pipe fittings are valid and that the quality of the stainless recommended for biomass combustion devices is AISI 316 (do not give cat by a hare!). This material is very durable and resistant to corrosion; its name “stainless” says it all.

It is a little porous material, a fact that will influence the soot to cost more to adhere to the walls of the tube, which will impact on spacing the chimney sweeping times. This type of A234 WP11 pipe is ideal for the entire installation, although it can be complemented with a galvanized steel tube to reduce costs. The price of stainless concerning galvanizing is three times more.

Simple galvanized steel tube

This type of pipe is of lower quality than WP22 fittings stainless. Although well-installed, we can achieve a durable and economical installation. What we should never do with this type is to install it immediately after the stove or fireplace (this would be the first tube that comes out of the stove). The material it is made of is steel with a high-temperature bath of liquid galvanized. The manufacturing process of this one is very simple, which consists of submerging the steel in bathtubs. We can then say that a coating has been added to the tube.

Although this galvanized protects the Carbon Steel Flange from corrosion, if we place it just after the stove, the high temperatures generated at the exit of the stove (400 or 500 degrees Cº), will cause the galvanized bath is scaled or cracked and will go through a process in which the tube will end up losing this protection.

Simple black vitrified steel tube

This conduit is also raw steel with a bath at high temperatures, but in this case, the bath is glazed (vitrified), and the finish is a gloss black, which makes it ideal for installations where the A420 WPL6 tube must be seen (wood stoves and metal fireplaces are seen). It can also be used as a substitute for the stainless steel tube since the price is very affordable (it is between galvanized and stainless), and its durability and resistance has nothing to envy to the high-end. In installations carried out by Calortek, we have verified that a vitrified tube after several heat tests acquires a hardness that makes it almost impossible to scratch it. In this case, the glazed bath that is applied results in a tube of little porous material, which is very comfortable for cleaning.