High Temp Exhuast Fan

[Roach]

In a high temp exhuast fan (i.e. 15-1600ºF), do you mount the floating bearing on the fan side or the sheave(drive) side?
Does the shaft grow towards or away from the heat?
If I mount the floating on the sheave side, I am compromising belt life because of sheave alignment? Is this correct?

 

[fredb]

Hello,

The bearing on the sheave end should be considered the fixed bearing, the fan & shaft to expand outward from that point.

 

[Roach]

I thought that was right, but I needed a second opinion, since the fan manufacturer suggested the opposite, but could not tell me why. Thanks for the help!!!!!

 

[ChasBean1]

Roach, go with what the manufacturer said. Write down the day, time, contact, and verbiage! To heck with engineering, save your warranty! (Remember the movie China Syndrome, "to hell with what the book says - do you want to live?!&quot.

But really, usually there's a guru at the company who won't return your call for a few days... leave him a few messages about your concern. I totally agree with your and Fred's philosophy, but there might be some pesky clearance issue on the other side of the fan that is unbeknownst to us at this time in this forum.. -CB

 

[Roach]

The warranty is no more, and I'm pretty sure that the fella I talked to is no guru(he was there to answer the phone immediately, and could not give me a reason why). Plus, I'm sure that if you have been in a manufacturing environment,you know that the lube on the bearings will be my problem, not the shaft expansion. I was curious to see what the general consensus was, and if my logic was shared in the eng community.
Thanks for the responses, maybe I can help you guys out one day.

Roach

 

I have two units. One for up and one for downstairs.
The outside unit for the up runs but the blower/fan is not turning on. I have checked the filters, tripped the breakers
with no results.

Any suggestions?

 

I have two units. One for up and one for downstairs.
The outside unit for the up runs but the blower/fan is not turning on. I have checked the filters, tripped the breakers
with no results.

Any suggestions?