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Ceiling Height for 63% Rule Taking Into Account Final Keystone?

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  • Ceiling Height for 63% Rule Taking Into Account Final Keystone?

    Yo...
    Bearing in mind that the final keystone will make the dome less rounded. When calculating 63% of the dome's ceiling height in order to work out the ideal height for the dome door, should the figure you use for the ceiling height be the actual dome ceiling height with keystone in place or the height the dome would naturally be if it could follow its curve to the end (without the interruption of the final keystone)?

    Thanks as ever,

    LEAO+
    www.leon.cat
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