| Roof Plane Area served by downpipe (M2): |
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| Location of bends Enter 1 if:No- bend outlet at one end or 2 if
Right-angle bend within 2 metres of outlet or 3 if:Right-angle bend 2-4
metres from outlet: |
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| Length of Gutter: |
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| Enter gutter fall |
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| Location or Gutter: Type 1 if Internal or 2 if External: |
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| Select your location: |
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