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From: <bp@www.zefox.net>
Newsgroups: rec.crafts.metalworking
Subject: Re: OT: Finding a mechanical engine fan by dimensions
Date: Wed, 24 Apr 2024 04:11:21 -0000 (UTC)
Organization: A noiseless patient Spider
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I decided to order a fan from Amazon, based on a few words on 
the manufacturer's website:
https://derale.com/product-footer/belt-driven-fans/fan-clutch-fans/standard-rotation/17117-17120-detail

Flange bolt circle: 3" / 3 1/4"
Flange diameter: 2 3/8" / 2 5/8"

After long reflection it crossed my mind that what they called "flange diameter"
might be the centering boss diameter. I'll find out in a week.

Thanks for everybody's patience!

bob prohaska