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Author Topic: NEC filter price Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 05-18-2015 05:47 AM                     One thing to watch out for on concrete floors is that they are sealed up. Concrete can shed dust otherwise (rather easily).  |  IP: Logged Leo Enticknap Film God Posts: 7474 From: Loma Linda, CA Registered: Jul 2000 posted 05-18-2015 11:38 AM                        quote: Brad Miller In dealing with theaters all over the US, I can absolutely vouch for the booth environment dictating if rewashable filters should even be an option. Absolutely - how much crud is in the air determines how much crud gets caught in an air filter, and thus how often that filter needs replacing or cleaning. Shortly after moving from England to the US, my wife asked me to investigate why our home HVAC system wasn't working properly - the air flow through the ceiling ducts was very weak. Home air cooling systems are simply unknown in Britain (climate too cold to need them!), and so I had to start by reading up online about the basics of how these things work. "HVAC 101" took me to the panel air filter in the furnace unit. It was totally and utterly black - filter replaced, strong blasts of cold air restored. When I asked the guy at Home Depot how often one is supposed to replace these things normally, his reply was that it depends almost entirely on the air quality where you live. At the bottom of the Inland Empire valley, where the smog settles = every 4 to 6 weeks. Up in the San Bernardino mountains (e.g. Arrowhead or Big Bear) = every year to 18 months. Drive up there and look down, and you can see the smog hanging over San Bernardino - a lovely brew of desert sand, dust, exhaust fumes and the output of the various industrial facilities in the area, Ontario Airport, etc (SB has been found by one study to have the lowest air quality/worst pollution of any metro in the US). It's all being sucked into everyone's HVAC filters, hence why you need to replace them so frequently.  |  IP: Logged Monte L Fullmer Film God Posts: 8367 From: Nampa, Idaho, USA Registered: Nov 2004 posted 05-19-2015 05:14 PM                     It seems apparent that these digital units should have been installed in a "clean room" surroundings. For some of these installs are just plain horrible to witness when it comes to clean surroundings when it comes to dusty conditions.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 05-25-2015 04:02 PM                     quote: Monte L Fullmer For some of these installs are just plain horrible to witness when it comes to clean surroundings when it comes to dusty conditions. Yes, and that's the primary reason for using NEC projectors in places like this. They won't get dirty inside, at all and equipment will likely last longer as a result. Mark  |  IP: Logged Mike Blakesley Film God Posts: 12767 From: Forsyth, Montana Registered: Jun 99 posted 05-25-2015 10:24 PM                        That's true. Forsyth is "dustville" to the max due to the railroad, mostly (lots of areas that aren't paved near the tracks), plus the city loves to spread sand during the winter and not pick it up until late April, so that's even more dust. And our building is 85 years old, so all of that adds up to our booth can get dusty -- but our projector is spic-n-span on the inside.  |  IP: Logged System Notices Forum Watchdog / Soup Nazi Posts: 215 Registered: Apr 2004 posted 08-27-2016 08:47 PM                 It has been 459 days since the last post.  |  IP: Logged Steve Kraus Film God Posts: 4094 From: Chicago, IL, USA Registered: May 2000 posted 08-27-2016 08:47 PM                    Interesting thing about the OEM NEC filters is that the "unwoven" fabric has tiny pores. I don't mean microscopically; you can see them with the unaided eye if you look really closely. I presume they know what they are doing but seems like they would let particulates through. Isn't the OEM filter considered the best? If MIT could get theirs made with thicker sidewalls instead of card stock akin to index cards, they would be a lot better. They told me over the phone that they get theirs from the same factory that supplies NEC. If they do...they are sure not buying the same ones! The metal screen filters are mentioned on NEC's own site but for the lamphouse only. If you see dust buildup you must, it says, go back to the regular unwoven filter. I guess that makes sense considering film lamphouses rarely got filtered air.  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 08-28-2016 09:55 AM                     Having worked with the filters from the manufacturer and the OEMs...they seem to continually evolve. I've seen them with cardboard frames, plastic frames, white edges, black edges, with more pletes, less pletes, dividers between pletes. They all work and fail to varing degrees. The current MIT knockoff filter set to the NC900 is a dead ringer to the factory installed filters. The MERV rating on the knockoffs are supposed to be the same as the factory (I have not nor have the facilities to test this). I've seen VERY dirty projectors using the factory filters so they are not a guarantee of success. The original Strong knock offs were not too good. They were restrictive of air flow, fit too loose (so dirt could go around the filter) but they have evolved their filters a couple of times now and while have thin white edges, plete wise, are pretty much the same as the original. NEC claimes that their edge has a metallic strip on it so that it will do a better job of stopping dirt electrstatically. I have not seen it work dramatically well. I'd rather see ALL of the projector companies and those that are making aftermarket filters go to what Christie used on their CP2000S/SB series...a filter with a tight-fitting rubber seal around the filter that seals it up better. I dislike the metal mesh filters immensely. They don't filter sufficiently and they expect the end user to clean them regularly. I've found that getting people to change a dirty filter is going to be MUCH easier than getting people to regularly clean the metal mesh well without damaging it. I think a lot of the filtration problems could be improved by going with a cheap "air register" type filter on the OUTSIDE of the projector and servers (yes servers and anything else with a fan such in crud too). It will stop the popcorn oils from getting in. In a sense, Christie is already doing this with their LAD filter that is really just sitting behind the main filter.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 08-28-2016 08:34 PM                     I have a few customers in very dusty locations placing thin foam tape around the edge of the NEC filters so they seal better. It seems to be pretty effective too. I also thought of having some thin rubber gaskets cut that would go in first then the filter up against them to seal around the edges of the filter. It would work the same as the foam tape but would last much longer. Mark  |  IP: Logged Steve Kraus Film God Posts: 4094 From: Chicago, IL, USA Registered: May 2000 posted 08-28-2016 10:23 PM                    I bought two sets from MIT about a year ago so I have the ones with the white card stock frames. I used very thin weatherstrip to help seal the edges and prevent leaks. The adjoining filters I put double stick foam tape between. I do have my OEM orginals saved. After vacuuming them I did a *very* elaborate washing process with mild dish detergent involving 4 washes (including two overnight soaks), multiple rinses also including long soaks, and a final rinse in distilled water so no dissolved solids in tap water would be deposited as they dry. Whether I ever actually reuse them is debatable but seems like I could. I cannot imagine a theatre being as thorough. FWIW they do seem to withstand careful washing without damage. I have another MIT set still to use and if they have changed since one year ago, I am tempted to buy some just to see if they've gotten better.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 08-30-2016 09:41 AM                     The MIT filters are the same as they have always been.... It's all I sell anymore. The NEC filters are too spensive for most of my customers that need to frequently change them. Mark  |  IP: Logged Steve Kraus Film God Posts: 4094 From: Chicago, IL, USA Registered: May 2000 posted 08-30-2016 02:05 PM                    Where would you even get NEC filters if Strong is supplying something else? And how much are they?  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 08-30-2016 05:59 PM                     You can order the NEC filters from an an authorized NEC Parts distributor if everyone else evaporates... Mark  |  IP: Logged

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