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  • Frequently Asked Questions

    Chimney Pots


    Which pot will stop rain coming down the chimney?

    The most effective chimney pot to prevent rain entering is the H pot or alternatively, the Decorative Fuel Effect pot.

    What pot is suitable for a gas fire?
    Due to the extremely large number of different types of gas fire available, we would recommend that the appliance manufacturer is contacted, to confirm which type of pot/terminal would be suitable for use with their appliance.

    Which pot is suitable for a living flame gas fire?


    Which pot is suitable for solid fuel?

    Any open pot is suitable for solid fuel.

    What does a multi fuel pot do?

    This pot can be used for more than one type of fire. It can be used on a living flame or solid fuel.

    Which insert can I put in a crowned pot to stop the rain coming down?

    There is no suitable insert to go on top of a crowned pot.

    Which pot is suitable for a redundant flue?

    Flue vent, bonnet hood and mushroom hoods may only be used for redundant flues.

    Should I seal my flue when the fire feature has been removed?

    Fitting a flue vent will prevent the ingress of rain and birds and allow the flue to ‘breathe’
    A flue may be totally sealed by the fitting of a blanked off pot

    Where can I buy your products?

    Builders Merchants or Roofing Merchants.

    Why can’t I use a bonnet hood on my coal fire?

    This pot does not give enough free air space.

    Do you make special chimney pots?

    Occasionally we can manufacturer special pots.

    What pot helps reduce downdraught?

    The best chimney pots to use to reduce downdraught are the H pot, Louvre pot and the Vortex pot.

    Which pot helps improve draw?

    Pots with multiple vents in the wall of the chimney pot can improve the operation of the fire by allowing smoke and flue gases to be drawn up the chimney faster. Select Sankey Pots and Vortex Pots. Bishop, Windguard and 3-bowl pots also provide extra ‘draw’ for fire efficiency

    Which is the best pot to overcome the effect of wind?


    When can you deliver?

    We generally deliver within 4 working days.

    Flue Liners


    Which way up should flue liners be installed?

    Flue liners should be laid with the socket of each section uppermost. This ensures that condensates and rainwater are not able to leak out from the flue into the surrounding masonry.

    What should be used to seal the joints between the liners?

    The joints between the liners must be made with flue liner jointing compound, or a fireproof mortar.

    How many flue liners will one tube of jointing compound joint?

    The cartridge contains sufficient cement to seal approximately four joints, based upon 225mm diameter flue liners.

    What size flue liner do I require for an open fire?

    For open fires with a standard fire opening up to 500mm wide by 550mm high the minimum required flue is 200mm diameter or a square flue having the same cross-sectional area and a minimum dimension of not less than 175mm. For fireplace openings greater than 500mm x 550mm, the flue liner size is based on a nominal cross-sectional area equal to 15% of the total face area of the fireplace opening.

    What is used to fill the void between the flue liner and the surrounding masonry?

    The void could be filled with a weak insulating concrete such as mixtures of: one part Portland cement to 6 parts vermiculite; or one part Portland cement to 10 parts perlite.

    Can a flue be built straight or should it have an offset?

    Both the regulations and standards recommend that bends in the chimney be avoided as a straight vertical chimney performs better. If bends are necessary there must be no more than four in the length of the flue.

    What is the maximum angle of bend allowed?

    Where bends are used they should be angled at no more than 45°C to the vertical.


    Ridge tile


    How do I calculate the angle of ridge tile required?

    To calculate the angle of ridge tile required; 180° – (pitch x 2) = ridge tile angle




    What is the free air space on your airbricks?


    Sq Hole Louvred Rectangular
    215×65 1,300mm2 1,290mm2 2,176mm2
    215×140 2,250mm2 2,580mm2 6,144mm2
    215×215 4,624mm2 3,650mm2 9,216mm2


    Firebricks & Fireclay


    What is fireclay used for?

    The fire clay we sell (Y137) has no cement content and becomes solid only when it is subjected to the heat of a fire. In using fireclay, the very minimum amount of water should be used to make the clay workable and heat should be introduced to it gradually to avoid cracking. We would not recommend using fireclay in any domestic heating application, such as jointing firebricks, due to the material being heat setting, and it would be virtually impossible in a domestic heating application to reach the required temperature for optimal performance.

    Can fireclay be used like cement?

    No, fireclay must be mixed with water and is purely used to bond firebricks together.