When we were at the Guru's I think they told us the port was 1 1/8 or 1 1/4". RC will know cause he bought one. As for the fan size, Puff was regulating his w/o one so I wouldn't think it would take much.
If it's tourist season, how come I can't shoot 'em?
I run the Pit Viper fan with a HeaterMeter and 1.5" pipe on my smoker. Once it's up to temp the fan only runs at 5-10% to maintain temp so I'd say it's more than enough. The 1.5" tube too.
The dimension Pete mentioned was for the inside of the adapter for the fan but the adapter screws into an 3/4" pipe fitting which is really the smallest dimension. I bought the PitBull fan when I got mine. I did that so I could also use it on other types of CCs. Like Michael said, it runs 5-10% when approaching the designated temp you set it on. This fact makes me wonder why they thought it would over shoot the temp. It does a great job, I would recommend it to anyone. The remote access is great, it will even reconnect to the wifi automatically if there is a hiccup in power or internet.
jm2cw
Current Smokers: Backyard RF Offset and Hybrid RF Offset trailer rig with Cowboy cooker and fish fryer, always room for more........