About the distance from the insulated double chimney to combustibles

We are often asked questions about installation in an insulated double chimney, so we will answer them.

Actually, it's easiest to understand if I explain it with an illustration, but I don't have the ability to draw diagrams using a computer, so...

I will look into it soon.

Basically, it is regulated in the United States and Europe that the distance from the insulated double chimney to combustibles should be at least 5 cm.

This combustible material literally burns.

In other words, in general, even if it is a gypsum board, there is a possibility that it will burn even if the wall is covered with vinyl cloth from above, and even if the vinyl cloth is certified not to be subject to the interior decoration restrictions of the Building Standards Law. It is safer to leave it on.

Also, the wood and plywood used as the base when penetrating the wall.

Plywood and rubber asphalt roofing when penetrating ceilings and roofs, etc.

If you throw it into a fire, it will burn.

Please keep a distance of at least 5 cm from these objects.

and regulated in the United States.

The surface temperature of an insulated double chimney can rise to around 70 degrees when it is high.

Therefore, keep a minimum distance of 5 cm from the surface of the double chimney.

What about a single chimney or single chimney?

In this case, it is necessary to keep a distance of 45 cm from the combustible material on the wall.

In the case of a single chimney, when the surface temperature of the chimney is high, it may rise to nearly 300 degrees.

Therefore, if exposed to this heat for a long time , there is a danger of charring combustible materials within 45 cm and igniting.

How about putting a heat shield called a heat shield on the back of the chimney?

In this case, it is written that it is possible to reduce the distance to the combustible material on the wall to 1/2.

In other words, the distance from the chimney to combustibles can be reduced from 45 cm to 22.5 cm, which is half of that.

The most important thing to keep in mind when using an insulated double chimney is to keep a distance of at least 5 cm from combustibles.

When penetrating a wall or roof, it may be safer to cover combustible materials with a fire-resistant material such as silica gel in anticipation of safety.

Discoloration and charring of visible parts can be noticed if you look at them, so there is almost no danger.

The most dangerous places are inside the walls and ceilings, especially in areas where the air is sealed and the temperature rises rapidly.

We strongly recommend that you open such areas regularly and check for discoloration!

Everyone, please be careful when constructing.