Disclaimer: My company distributes the product I am going to mention here. However, it is a topic that has always been on my radar, and the list has seen spirited discussion about the pros/cons.

Justrite has just announced a new cabinet vent damper designed for flammable storage cabinet systems. It features a fusible link that melts at 165 =B0F which releases a spring mechanism than closes the damper.  So you get the best of both worlds - keeping odors/dangers at bay and ensuring operational integrity.  You'll need two dampers per cabinet, of course, one for the intake and one for the exhaust. So the added cost may or may not be worth it for some people depending on their circumstances.

A product description and some downloads are available on my company's web site: http://www.safetyemporium.com/j-25777  And you can get them from any Justrite distributor, of course, so no pressure: https://www.justrite.com/featured/25777-safe-t-vent-thermally-actuated-damper-for-venting-cabinets.html  Not sure of the availability just yet as this is a new product.

Stay safe!

Rob Toreki