Chimney Pots & Flue Terminals
The design profile and outlet dimensions of the chimney pot or flue terminal should preferably equate to the shape and cross sectional area of the flue lining. Minimum recommended dimensions are dependent on the size of the fireplace opening, size of the flue lining or appliance outlet, type of fuel and/or appliance.
Chimney Pots and Flue Terminals suitable for use with Solid Fuel Open Fires and Closed Appliances.
Fireplace with an opening of up to 500mm x 550mm: minimum 200mm diameter or equivalent square/rectangular cross sectional area with no dimension less than 175mm. Fireplace with an opening in excess of 500mm x 550mm: flue and terminal outlet equivalent to 15% of the area of the fireplace opening with no dimension less than 200mm.
Closed Appliance up to 20kW rated output: minimum 125mm diameter
Closed Appliance up to 30kW rated output: minimum 150mm diameter
Chimney Pots and Flue Terminals suitable for use with natural draft open-flued Gas Burning Appliances.
Flue sizes up to 170mm diameter should be fitted with an approved gas terminal complying with BS 715:1993 and BS 1289-1:1986. Flue sizes in excess of 170mm diameter may be fitted with suitable terminals to prevent ingress if the total free area of the outlets is at least twice the cross-sectional area of the flue.
Chimney Pots and Flue Terminals suitable for use with Oil Burning Appliances
Minimum dimensions should be the same size or equivalent to the cross-sectional area of the appliance flue outlet. Suitable terminals may be used to prevent ingress if the total free area of the outlets is at least twice the cross-sectional area of the flue.