On Aug 12, 2014, at 3:09 PM, Tom Morris <bluen...@gmail.com> wrote: > One important question: how often is the equipment accessed for maintenance?
Who knows :) Maybe it becomes someone's full time job to go do regular checks and maintenances of every POP? Maybe after an appropriate filter is found, a relatively low temperature threshold monitor is set up in an NMS. When this threshold is reached, it would probably be safe to assume a dirty filter (or some other condition that would require a visit) and someone could be dispatched to replace it. > I've had reasonably good luck with air filter media coated with a tackifier, > similar to the Dustlok media here > http://www.filtersales.com/pagout.htm?id=Pad%20Media > It seems like what happens with it is heavier airborne fibers (lint, hair) > get caught up in the first few fibers of the media, not obstructing airflow, > and allow the finer dust to travel deeper into the media where it sticks to > the tacky layer at the back. It lasts a good long while. It's single use > though, so it has to be replenlished every now and then. > > Foam rubber media tends to have trouble with surface/airflow area vs pore > size. > > The best option, though, will be to enclose the equipment in a cabinet that > can be pressurized by one or more fan forced+filtered inlets. Middle Atlantic > makes rack cabinets and fan panels that can be used to pressurize them that > way. If you get a cabinet that takes a standard furnace filter, I've had good > luck with the off the shelf 3M Filtrete Ultra Allergen filters, they have a > TON of surface area with great fine dust capture and very low airflow > resistance, even when you're drawing the air through them really way too > fast. :) Unfortunately a cabinet isn't possible due to a variety of issues. > > On Tue, Aug 12, 2014 at 2:19 PM, Jason Lixfeld <ja...@lixfeld.ca> wrote: > Hi, > > I'm interested in knowing what sorts of material folks use to make > after-market dust filters for their various devices which wouldn't normally > have any. This seems to almost be a necessity when these kinds of devices > are deployed in environments that are overly dusty and dirty (it should also > be implied that these environments are all in-doors and would have less than > ideal airflow and climate control). > > A material that is too dense will hider airflow and cause an immediate > increase in inlet temperature, which would exacerbate a potentially > threatening temperature situation in environments where the ambient > temperature is already in the mid to high twenties and above (that's 77 - > 86F+ for my American friends ;)). A material that is not dense enough won't > do a very good job at filtering. > > Do folks just hack up HEPA filters or something? > > > > -- > -- > Tom Morris, KG4CYX > Mad Scientist and Operations Manager, WDNA-FM 88.9 Miami - Serious Jazz! > 786-228-7087 > 151.820 Megacycles
