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                  Note:	
                 
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                 The fields will be pre-populated with default dimensions. These dimensions are governed by the details defined in the HVAC Catalogue. The End Extension default is auto but can be changed by you to a required dimension. The Fixing to Duct joint default is joint defined in the HVAC Catalogue but can be changed by you to the required joint. 
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                 Click Unchanged (default when Modify is selected) - positions the piece of HVAC at the co-ordinates 0.00. 
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                  Note:	
                 
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                 Unchanged is usually used, when Modify is selected, it does not connect the piece of HVAC but positions it at 0.00, in effect in a floating position. 
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