Secondary Glazing Surveying Instructions
| 1. | Take the overall size from wall B to wall E and minus 10mm, i.e. 1780mm becomes 1770mm | |
| 2. | Measure from the wall to the centre of C and minus 5mm i.e. 785 becomes 780mm | |
| 3. | Measure from C to D - centre to centre to line up all mullions | |
| 4. | Measure from wall A to wall E and minus 10mm |
This gives an all round tolerance of 5mm
| 1. | Measure from wall D to wall C and minus 10mm | |
| 2. | Measure from wall A to wall C and minus 10mm | |
| 3. | Measure from wall A to the centre of B and minus 5mm |
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