Hello Fitter.
I like you circulator manifold. I hope to see it in person sometime.
Haven't forgot about you, but I haven't been to Mayville/Hartford yet.
I bought the 230 from SC. It is a CW rotation to. The grainger is CCW. To install the SC blower with the air inlet up (so you can install the air shutter), the blower housing will hit the burn auger. Also, the motor is external. (probably better for this app.) I've thought to install one in the orig. location, with the inlet down, you would need to "hinge" a shutter, and counter balance with a light spring, and have the solenoid pull down. It would be a little science project in itself to recreate that shutter function using the existing solenoid.
I cut a hole in the side of my airbox and installed a 2nd grainger 2C067. I was so far out in left field and nervous about the cold weather last week, I wanted more air, to help with a poor? fuel situation. I may still be in left field but with all the information I learned last week, I started fresh on Sunday. cleaned out the bin and burn pot. Installed new flighting on the burn auger and got the boiler to setpoint at about 10pm last night. Time will tell.
If I had to do over again. I might try another Grainger fan, mount it above the existing, and use the solenoid power to run fan number 2. I might use a "static" manual shutter setting on fan 1. I hope to get stabilized this week, and I will see what affect the 2nd fan has.
I didn't mount above the existing because my auger purge tube was in the way, not very flexible, and I didn't want to retap those 3/4 fittings.
With all that said:
I do have a 230 CFM blower from SC available if someone wants it.
I will keep my spare 2C067 grainger fan.
I do have a spare solenoid - new from grainger (when I bought the fan).
Tim