A 3450RPM fan will probably not be quiet. So I suggest giving it a listening check befor building the mounting frame and installing it. many long years ago it was considered smart to install a large high powered fan to vent the whole house. But they were very noisy and so they were seldom used. I did provide one client with a variable speed controller for the fan in her residence. She quit using it after a week because even at a low speed it was way too noisy..
So I am suggesting you try it first.

 

So I am suggesting you try it first.

My Harbor Freight dust collector inspires me to use hearing protection. Yes, it's loud as heck. And running a blower like that in the attic would definitely be noisy. Both inside the house AND outside. In this instance, perhaps running it at 1/4 power might be more beneficial. However, the suggestion of a whole house fan - while it is an intriguing suggestion, the practical use of a 50 pound motor in the attic just isn't a feasible one. So - no - I won't be putting it in the attic. I merely acknowledged the suggestion.

 

OK, and good thinking! Somehow I got a wrong impression, someplace I read a comment about welding up a support for an attic fan, which now I don't find.
Interesting about the failed outside compressor unit and that fan. The shortcuts taken building some of those units are amazing, especially with the concern about Freon as an atmospheric pollution material. That would point towards making the AC system a longer lasting package instead of a dispose and replace item. (But that is certainly off-topic)

 

Interesting about the failed outside compressor unit and that fan. The shortcuts taken building some of those units are amazing, especially with the concern about Freon as an atmospheric pollution material. That would point towards making the AC system a longer lasting package instead of a dispose and replace item. (But that is certainly off-topic)

Talk about off topic! This thread so far hasn't even mentioned a compressor or AC.

 

OK, It seems I responded in the wrong thread.

 

someplace I read a comment about welding up a support for an attic fan,

That could be a potential application, except for the fact that the darn thing is so dang heavy. Don't know off hand what it weighs, it's just heavy. Heaving it up into the attic wouldn't be fun. Then I'm going to have to weld up a mount for the motor that can fit into the attic through the access holes.

Yes, I was the one who spoke about welding up a bracket for the motor. The whole point of the comment hinged on putting an attic fan in the attic made from a 2 HP 240VAC Single Phase motor. Anecdotally speaking, putting that monster up in the attic wasn't a very good idea. Potentially, yes, it COULD be done.

The shortcuts taken building some of those units are amazing, especially with the concern about Freon as an atmospheric pollution material. That would point towards making the AC system a longer lasting package instead of a dispose and replace item. (But that is certainly off-topic)

I think you're mixing up in your head two different threads. The "Other" thread was about a condenser cooling fan rated for 240 being happily run on 120 VAC. The comment was offered as a possible use for this AC motor. But the darn thing weighs a good 60 pounds (27.215 Kg). I don't really want to try climbing a ladder while hanging on to the motor. If I drop it something is going to be smashed. Possibly myself. So - no - I'm not turning it into an attic fan. I already have a fan that can be adapted for that very use. Not a project I want to pursue.

Back to the intent of the question: "What happens if I run a 230VAC single phase motor on just 115VAC?" In that vein, I've gotten my answer. It's not a good idea for numerous reasons. But thank you for keeping this thread going this far. Didn't expect it to take more than one page to get my answer.

 

Some Times threads wander quite far away from the original topic.
In this case there was a mix.
The revelation is that in most instances motors deliver rated performance when operated at the voltage that they were designed to operate at, and while they may also perform at other voltages, the performance will not be near the original specifications.

 

Some Times threads wander quite far away from the original topic.
In this case there was a mix.

OK I agree about threads going off topic, but explain to me how you post an answer in one thread about something in another thread. You had to have this thread open to post in it, or you have some magical computer.

 

@shortbus - c'mon.

 

@shortbus - c'mon.

He knows why I call him out.

 

Comments deleted after being advised to stay out of things.

 

@ThePanMan
Stay out of it Pete.