Stormin Mormon wrote, on Mon, 22 Dec 2014 20:16:27 -0500:

The thing with two rods, sleeves, and what looks like a coin cell, is a
thermal cutout. It "should" be self resetting. Continuity is good. Does
not measure air flow.

Seems reasonable.

I don't know what measures air flow.

This is a "pressure sensor", with a black tube connected to the air
chamber; but I don't know how to test it yet:
https://c4.staticflickr.com/8/7516/1...46b2ae86_c.jpg