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B 30mm/m fall to boiler Concentric inline drain & trap to drain 400 min 1000 WL max (max. working length) Note. If B > 1085mm then a flue condense trap should be fitted, ideally as close to the boiler as possible. This should then be piped, via a tundish, to drain, as per the boiler condense drain. Flue and boiler condensate drained via tundish 135 WL 150 YX Min 3m from ground level Flue classifications and diagrams Explaining flue classifications For details of the full range of flue system classifications refer to BSI publication PD CR 1749:2001. Open Flue Type B An appliance intended to be connected to a flue that evacuates the products of combustion to the outside of the room containing the appliance. The combustion air is drawn directly from the room. Open Flue Type B2 A type B appliance without a draught diverter. Open Flue Type B23 A type B2 appliance incorporating a fan upstream of the combustion chamber/ heat exchanger. Room Sealed Type C An appliance in which the combustion circuit (air supply, combustion chamber, heat exchanger and evacuation of the products of combustion) is sealed with respect to the room in which the appliance is installed. Room Sealed Type C1 A type C appliance that is designed for connection via its ducts to a horizontal terminal, which at the same time admits fresh air to the burner and discharges the products of combustion to the outside through openings that are either concentric or close enough to come under similar wind conditions. Room Sealed 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 openings that are either concentric or close enough to come under similar wind conditions. Room Sealed Type C5 A type C appliance connected to separate ducts for the supply of combustion air and the evacuation of the products of combustion. These ducts may terminate in zones of different pressure. Room Sealed Type C13 A type C1 appliance incorporating a fan upstream of the combustion chamber/heat exchanger. Room Sealed Type C33 A type C3 appliance incorporating a fan upstream of the combustion chamber/heat exchanger. Room Sealed Type C53 A type C5 appliance incorporating a fan upstream of the combustion chamber/ heat exchanger. Boiler flue options Water heater flue options Stratton mk2 Wessex ModuMax mk 3 Purewell Variheat mk2 Upton Melbury C Melbury HE Ansty Ensbury Varmax Dorchester DR-FC Evo Dorchester DR-TC Dorchester DR-CC Flue options B23 • • • • • • • • • • • • C13 • • • • • C33 • • • • • C53 • • • • • 83 01202 662500 | sales@hamworthy-heating.com | hamworthy-heating.com Additional Products

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