1.I just find this post and reply some question here
2.You can disable alarm. Say target temp. at 225F, simply set AH=235 or 240F, AL=215 to 210F
3.I am supplying AC/DC adapter 12 VDC 5 AMPS. now
4.I have rainproof SS box. The full system can be placed inside this SS box. Looks neat,
5.In 2 weeks I will have a plastic box to hold full system. a 3' feet SS corrugated pipe will connect fan and pit air inlet.