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Samir,
I was looking at my RORO roof this morning and thinking about the dust issue.
Sealing the ends is very straight forward with rubber tube being compressed as the roof closes - the real issue is the sides.
On my set up I have side strips about 200mm long which drop down from the roof and overlap the sides of the observatory. There's an obvious clearance gap - which you need to give free rolling of the roof -BUT
What if these side plates were hinged at the top and with a small spring could be "lifted" further way from the outer surface of the walls. The a seal strip - foam/ rubber etc could be fitted to the outer surafce of the walls just above the edge of the side strip....Making any sense?
Then as the roof closes a series of wedges (probably three per side) engage with similar on the outer surface of the side strips to gently force them in towards the walls - compressing the foam and giving a pretty good dust seal???????
I think this is a simple solution to try out???
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