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Once you install it you need to tidy it up.
Ideally you need to leave a metre and a half of the 16mm duct and about six metres of the 7mm duct - with all the 7mm spurs exactly the same length.
If B4RN do not find it like that they join bits on or cut them off to achieve that result, so it is not essential to fiddle around in the mud and rain to get everything just so.
The same with labelling - if there are only 2 or 3 spurs from a chamber then the effort involved to label them nay be far greater than the simple task it is for B4RN to work out which is which. (In the case in the picture perhaps labelling would be good.)
****Put the lid back on without pinching the duct
16mm ducts only have to be long enough so that they can be pulled out of the chamber and positioned so that fibre can freely come out when it is blown. Once fibre has been blown, this tail is cut right back. So leaving more than a metre of 16mm tail just gets in the way, it makes it simpler for everyone if you cut it back.
This is Over Kellet - the neatest.
The 16mm gets cut back eventually because it is not needed. The 7mm does not get cut back because the house fibre is too fragile, the long coils of 7mm are there as protectors and storage for the spare 2-core fibre.
Full Facts: You only need to leave enough 16 mm so that it can be left sticking out of the chamber at blowing time such that the fibre can spew out freely and not get caught up on anything. A metre would do it in most cases. B4RN need long lengths of 7mm to reach their horse-box trailer to do the splicing. This depends on how close they can get the trailer, you can't really assess this - so you leave as long a length as you think is helpful. 5 metres is reasonable. However, if any of the spare ends you have left are too short, B4RN simple add a piece on to make the tail exactly the length they want. So don't get hung up on trying to leave an exact amount.
The rules are different for a more busy chamber. With lots of spurs it will be helpful to the volunteer and to B4RN to have them the same length as you will need to be fairly organised just to get them stowed in the chamber. This will limit how much spare you can possibly leave, but think of someone having to get 20 odd ducts to the same length on winter's day.
Labelling the ducts.
When the fusers come they need to know exactly which duct belongs to which house. The markings have to be clear. One of the easiest ways is to get small cable ties or tape, and write the house name on a plant label with permanent marker. Preferably before blowing, but definitely once blown each duct has to be marked. There is no shortcut, the job has to be done, so you may as well do it as soon as you can. If you don't, the blowers will moan a bit but they will do it for you. It is no good putting 'freds house' or 'rose cottage' if the spreadsheet has it down as 20 Main St. The fusers will be looking for the spreadsheet names or they won't know what to fuse it to.
Getting large amount of duct ends stuffed into the chamber without pinching any under the lid. This is one method that might help - stick a spare bit of 16mm over the top
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