This is an old Q, but something that I was trying to find out all day.
Kingspan gave a flat NO. Apparently needs battens to give a 25mm airspace between board and wall. This negates use of K17 and advices use of K18. The timber recommended was 25mmx50mm TREATED TIMBER BATTENS, if I did not want to use metal furrings (what kind of a stoopidass name is that??!)
A furring is a tapered wooden strip commonly used to give a fall on a flat roof joist. I've never seen a metal one nor can think why it would be appropriate in this case.
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