Air extractor described can be big improvement but not approved in EASA world for most ships.
UH

http://ljpanels.co.uk/test/index.php...xtractor-ducts

We got his guy to make an extractor for the panel on our ASH 25 M. Works a treat. Really improved the ventilation by dragging air from the cockpit. With vents closed you can feel the air being sucked in through gaps in the canopy frame. We sent him the one on the ASH and he used it as a pattern.

Wings and Wheels sell his ASW 20 and ASW 19 versions.

Cheers

Paul