I am fitting fire doors to a flat, and need three hinges per door. There appear to be three grades of dire rates hinges, grade 7, grade 11 and grade 13. What's the difference between these?
Ok thanks - the door I have is 30kg - been searching the internet, and it appears 3 x grade 7 would do. The screwfix ones I have seen are grade 11 - does that seem ok?
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