BS EN 613:2021 pdf free download – Independent closed-fronted gas-fired type B11, type C11, type C31 and type C91 heaters.
4.2 Classification according to the method of evacuation of the products of combustion
Appliances are classified into types according to the method of evacuation of the products of combustion and of admission of the combustion air:
• Type B: An appliance intended to be connected to a flue which evacuates the products of combustion to the outside of the room containing the appliance. The combustion air is drawn directly from the room.
• Type B1: A type B appliance incorporating a draught diverter.
• For the purposes of this standard a type B1 appliance is an appliance that is connected directly or by means of an adaptor to a flue.
• Type B11: A natural draught type B1 appliance designed for a natural draught flue, which includes Type BI1AS Type BIIBS and Type Biics appliances.
• Type B1IAS: A type B11 appliance fitted with an atmospheric sensing device to prevent the release of combustion products in a dangerous quantity into the room under abnormal draught conditions.
• Type B11BS: A type B11 appliance fitted with a combustion products discharge safety device to prevent the release of combustion products in dangerous quantities into the room under abnormal draught conditions.
• Type Bii: A type B11 appliance not fitted with an atmosphere sensing device or combustion products discharge safety device, but is constructed to prevent the release of combustion products in dangerous quantities into the room under abnormal draught conditions.
• Type C: An appliance in which the combustion circuit (air supply, combustion chamber, heat exchanger, and evacuation of the combustion products) is sealed with respect to the room in which the appliance is installed.
• Type C1: A type C appliance that is designed for connection via its ducts to its horizontal terminal, which at the same time admits fresh air to the burner and discharges the products of combustion to the outside through orifices which are either concentric or close enough together to come under the same wind conditions.
• Type C11: A natural draught type C1 appliance.
• Type C3: A type C appliance that is designed for connection via its ducts to a vertical terminal, which at the same time admits fresh air to the burner and discharges the products of combustion to the outside through orifices that are either concentric or close enough together to come under the same wind conditions.
• Type C31: A natural draught type C3 appliance.
• Type C9: A type C appliance that is designed for connection via its flue duct to a vertical terminal and via its inlet duct to an existing vertical duct. The terminal at the same time admits fresh air to the burner and discharges the products of combustion to the outside through orifices that are either concentric or close enough to come under similar wind conditions.
• Type C91: A natural draught type C9 appliance.