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From: Dave Jones

I made a very workable valve for my cabin air inlet out of a 4" plastic slide valve used to shut off sawdust collector vacuums, as sold by Builder's Square. They also sell larger ones I think.

Now in the Winter, I can shut off the cold Northern Illinois air by pulling on a cable attached to the slide valve.

I am thinking of electrifying it.  It is fully adjustable for all different temperature ranges.  It is injection molded, however, and my not stand  up to engine temps.  But, I saw a similar valve (for sewer shutoff) in an RV (rec vehicle) parts store that was more substantial which may work in inlet cooling plenums.

David Jones, Pecatonica, Illinois

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