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Old 02-17-2009, 05:39 PM   #72 (permalink)
davidgrey50
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Two openings might work even better, as you could put a different rate spring on each for a two-stage blocking - flap 1 with a weak spring to close one opening for fairly fast, and flap 2 with a stronger spring to close the other opening for way fast. Of course, a flap could cover only part of a grille opening.
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