Dave Plowman (News) coughed up some electrons that declared:

Would one normally use a jointing/sealing compound *or* an assembly aid
(in the way that silicone oil may be used on push fit sewer pipes) on
these types of joints?

Manual doesn't make any mention but it may be assumed knowledge.

They push together easily. They're a mixture of plastic pipe, painted
steel pipe and 'rubber' seal - so I'm not quite sure which lubricant would
be totally safe on all of these.

Brilliant - thanks Dave.

Other than that, it seems perfectly straightforward. The most difficult
bit will be gauging the ventilation requirements as it will be sharing a
common airspace with a gas cooker and a log stove.

Eh? It doesn't draw any air from the room. Nor does it need any special
ventilation for cooling the exterior surfaces - just observe the clearance
given in the instructions if boxing it in.

I know that - it's only I thought I'd seen some ventilation requirements
mentioned somewhere (perhaps the Viper handbook), even for a room sealed
unit. I was only skim reading, but I have a thought in my head that says
it's for backup in case something leaks.

But I'm probably talking ********. I haven't made a concerted effort to
calculate the ventilation requirements of the various things yet so this
will come out in the wash when I do the research properly

Cheers

Tim