DEFRA Approved Stoves for Smoke Controlled Stove Areas Smoke-Controlled Stoves are DEFRA approved for use in smoke exempt urban, town and city zones.The Asgard2 stove is developed in co-operation with the Danish Technological institute. This gives this elegant wood burning stove the most effective combustion on the market. The effective combustion is also good for the environment, as it givesimpressingly good results when it comes to solid particle pollution. Asgard2 has anespecially low emission of particles – both when burning onhigh and low output. The Asgard 2 combines function and design in a perfect way. The wood burning stove is built of steel, and the widely spaced combustion chamber holds logs up to the size of 31 cm. As all other Aduro and Asgard stoves it is delivered with the unique Aduro glass cleaning system.