DEC RK05 HEPA Filters
billdegnan at gmail.com
Wed Apr 13 09:43:26 CDT 2016
On Wed, Apr 13, 2016 at 10:12 AM, Rick Bensene <rickb at bensene.com> wrote:
> Bill Degnan wrote:
> > I replaced my filters a little while ago, I was concerned about original
> > deterioration, perhaps these will have decomposed over time even if not
> > use. So I found a newly-produced filter, documented here:
> > http://vintagecomputer.net/browse_thread_record.cfm?id=588&tid=1
> > But basically 3M Filtrete #0412560 carbon pre-filter cut to match the
> > from a tracing.
> The filter Bill replaced is the external dust filter. While good to
> replace, this isn't the internal HEPA filter that Michael wrote about
> replacing on his RK05 drives, and that he found available on eBay.
> The HEPA filter is inside the drive. It is a filter designed to capture
> very tiny particles yet still be a minimal restriction to airflow. To get
> to the HEPA filter, you have to take the bottom cover off of the drive.
> The filter is quite large, and as mentioned, there are two different types
> depending on the age of the drive. If they haven't been replaced in a
> long time, they should be replaced, as they eventually do clog up with
> particulates. When this happens, it can restrict the airflow to the disk
> platter area, which can lead to dust particles ending up on the platter,
> and that can result in head crashes, which are most unpleasant. Sadly,
> the manufacturer of the HEPA filter stopped making them a long time ago,
> and they can be hard to find. I do believe some manufacturer was making
> reproductions of them for a time, but I believe that they are no longer
> doing so. So, finding the filters today can be tricky.
Oooo...yes my misunderstanding of what you meant. What he said.
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