Combustion Air

How is the combustion air supplied to my stove?

In general, the stove fire is supplied with enough air from the room it is installed in.

However, tightly sealed residential buildings may not allow a sufficient supply of air to the stove. To ensure an adequate air supply, almost all Hase stoves can be connected to a separate air duct that supplies the fire box with external air. For new buildings and building renovations, these external air supply ducts should already be provided for during the planning phase.

When is a direct vent stove required?

In rooms with ventilation systems, special safety precautions have to be observed, since ventilation systems can create subpressure. In turn, flue gas can enter the room through the stove's air inlets, which are normally used for supplying combustion air from the room where the stove is installed.

To prevent this from happening, our stoves are designed for safe combustion, independent from the pressure conditions of the ambient air in the room.

Certified direct vent stoves have an approval number from the Deutsches Institut für Bauwirtschaft (German Institute for the Building and Construction Industry) and have to meet the following criteria:

• due to their design, they have to be sealed tight enough to the installation location, so that, if there is excessive static pressure in the stove, potentially hazardous levels of flue gases cannot escape into the room where the stove is installed,
• an air duct can supply the combustion air directly from the outside, and
• the fire box door is self-closing.


Hase's Certified direct vent stoves are:

Akaba, DIBT approval number Z-43.12-186
Tula, DIBT approval number Z-43.12-225