Vespel is definitely not a thermoplastic, and you definitely do not want to cut it with heat. I'd suspect the same with PEEK but I haven't tried that...
These will sometimes get me to check through different means, just to make sure nothing has been hacked. Never use any links provided in the email.
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Its an simple Economizer setup, setpoint controlled by outside air temp. Below the setpoint the outside air kicks in and above the air intake turned...