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    [name] => Astrahingesuitability
    [title] => Astra Concealed Door Closer Suitability
    [content] => <p>The Astra concealed door closer is unsuitable for doors fitted with projecting or rising butt hinges. Projecting hinges are commonly used where the door needs to clear a projection e.g. brickwork or architraves and opens up to 180°. The pivot point of a projecting hinge is further away from the door face than a standard butt type hinge. Rising butt hinges are designed to lift a door over a floor that is not level or has thick carpet.</p>
<p>When fitted to a fire door, the hinges used need to be fire tested to either Euro standard 1634 or to BS 476-22, and should have gone through an EN 1935 performance cycle test. Projecting and rising butt hinges are not tested under these standards.</p>
<p>Astra concealed door closers are suitable for use on doors fitted with standard ball race butt hinges. Ball race butt hinges consist of a round central point, where a pin joins the two flat plates. Again, when fitted to a fire door, it is important to ensure that the ball race butt hinges have been tested to the necessary fire standards.</p>
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