DIBt - SETTING THE STANDARDS FOR STOVES OPERATING WITH INDEPENDENT EXTERNAL AIR
The German Institute for Buildings (DIBt) gives technical approval only to those stoves which, having undergone official laboratory tests, conform to its strict criteria for safe burning without the use of the surrounding air, thus relying solely on an external independent air source to provide all necessary combustion air. The tests check the leak rate, which has to be under 2,5 m³/h, at 10 Pa after thermal and mechanical stress. For example, this includes testing the stove‘s door seal for air-tightness after being opened and closed for a minimum of 6,000 times. All DAN SKAN Modern Line stoves conform to DIBt criteria.
DIBt approved stoves need to be connected to a well sealed external air connection. A valve mechanism to close the external air off when the stove is not in use is recommended. It is also important that all flue pipe and flue system connections are also well sealed. Approved stoves can only be installed in rooms where it is proven that, even with air removed from the room by, for example, ventilation fans, extractor cooker hoods, hot-air heating systems or air dryers etc, the pressure in the room or house is guaranteed never to be more than 8 Pa negative pressure. At the same time you must also ensure that the flue system draught is never lower than 12 Pa. The ideal room pressure for the successful operation of a stove is 4 Pa. Please check your local and national building regulations to ensure that your proposed installation conforms to air supply criteria.
AIRBOX: THE BENEFITS OF THE PATENTED AUTOMATIC AIR REGULATION AND HEAT EXCHANGER
Cold air, drawn in from outside, should always be heated before arriving into the combustion chamber, in order to maintain the fire chamber temperature which will ensure clean and efficient burning. External air can sometimes be extremely cold, often with freezing temperatures, and would make the stove burn poorly, possibly even putting the stove out, and also making it burn dirty so that it could fail today‘s environmental and emissions standards. Our patented AIRBOX (which heats the air at the rear convection area of the stove) combinded with our intelligent automatic air regulation system outlined earlier, enables you to get the very best out of your DAN SKAN stove and fuel every time by supplying the fire chamber with the optimal quantity of air at a highly efficient pre-combustion temperature.
The external air supply to the rear or base of the stove should be delivered through a 100 mm diameter duct provided that there is only one bend and that the distance to the outside air is less than 5 m. All joints should be well sealed. Should the distance be greater or the route require more than one bend then a 150 mm diameter duct must be used only reverting to 100 mm diameter when close to the stove connection point. Subject to local and national building regulations this duct should feature a shut off valve close to the outside air end to prevent cold air entering the house when the stove is not in use.
The installation of a DAN SKAN stove incorporating the AIRBOX system within a house with a heat recovery system must comply with local and national building regulations ventilation requirements. Please consult your installer or DAN SKAN partner who will be able to advise.
BASE INLET LOCATION
It is recommended that the location of the base air inlet opening to take the 100 mm diameter external air duct should be positioned at the centre rear of the stove beneath the stove base – see the diagram of a typical stove base floor plan.