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Author Topic: Projector/Console Ventilation Will Kutler Phenomenal Film Handler Posts: 1506 From: Tucson, AZ, USA Registered: Feb 2001 posted 02-24-2003 08:38 PM                     Each projector should have its own exhaust system. AND REMEMBER THAT THE EXHAUST SYSTEMS DO NEED TO BE MAINTAINED! this means going on the roof with a hand held grease gun and greasing the bearings via the zerc fittings...like doing your car. Exhaust fan belts also need to be maintained and replaced as needed. all of this should be part of your routine maintenance. At the theatre where I worked, this simple task turned into a real fiasco that did result in interrupted shows with refunds to customers. The G.M. at the time could not figure out if this was the responsibility of the HVAC company as part of their routine building maintenance contract, or of the building custodian. As a result of the office politics, this simple task never got done. This resulted in fan bearings crapping out and fan belts breaking...and the Xenon shutting down because exhaust air was not holding the microswitch inside the exhaust duct open. Several times, as a "temp" fix, booth personnel would have to let the xenon cool, open up the lamphouse, tape the microswitch up, open up back of lamphouse (Christie Console) and use a floor fan to pull out exhaust....not really a recommended practice. I solved the problem by pitching a bitch and got the $$ to buy a friggin grease gun...and proceeded to take care of it on my own... Also, it is recommended practice to clean the squirrel cage(s) in the lamphouse, and also the ones used on the projector itself. If you are using a Christie Console, look at the instruction/maintenance manual for reference to lubing (oiling) exhaust system bearings in and around lamphouse. STAY AWAY FROM W-D 40!!!! use a good sewing machine oil...or even Marvel Mystery Oil......  |  IP: Logged Brad Miller Administrator Posts: 17775 From: Plano, TX (36.2 miles NW of Rockwall) Registered: May 99 posted 02-25-2003 12:35 AM                     Barry, yes I would say 900 CFM would be perfect for your 4K console. (When in doubt, it's best to overdo it just a tad, although 750 CFM would probably suffice.) You should get excellent lamp life with that kind of exhaust.  |  IP: Logged John Pytlak Film God Posts: 9987 From: Rochester, NY 14650-1922 Registered: Jan 2000 posted 02-25-2003 10:08 AM                        Barry: You're planning on air-conditioning your drive-in booth?  |  IP: Logged Manny Knowles "What are these things and WHY are they BLUE???" Posts: 4247 From: Bloomington, IN, USA Registered: Feb 2002 posted 02-25-2003 10:37 AM                     Some time back, I posted a question about a lamphouse that was constantly killing lamps at a faster rate than the others of the same model at the same multiplex. In the absence of any apparent electrical faults and based on various Film-Tech responses and also in consideration of the fact that this particular projector is "at the end of the line" in the exhaust scheme, I am almost certain that these lamp failures are a result of inadequate cooling/exhaust. The lamps don't explode. The ends are not charred or discolored. They come out looking just fine, or else the envelope is all blue-purple inside. Everyone seems in agreement that this is a symptom of the lamp's seals failing, which could be due to overheating.  |  IP: Logged Barry Floyd Phenomenal Film Handler Posts: 1079 From: Lebanon, Tennessee, USA Registered: Mar 2000 posted 02-25-2003 12:23 PM                        quote: Barry: You're planning on air-conditioning your drive-in booth? Yes, our building is 34'-8" x 60'-0" on the main ground level and 34'-8" x 22'-8" upstairs. The downstairs is laid out where the Mens & Womens restrooms are at the rear of the building, the lobby area is in the center, and the concessions line and kitchen area are on the opposite end of the building from the restrooms. Directly above the kitchen and concessions line is the projection booth, office and a small restroom. The downstairs HVAC unit is spec'd as a 5 ton electric heat pump (both heating and cooling), and the upstairs unit is the same. By looking at the drawings and specs, he (the HVAC guy)upsized the unit on the second floor to compensate for the amount of air exhausted by the lamphouse. Downstairs it's the same thing, but instead of compensating for the lamp, it's the exhaust hood above the fryers and grill.  |  IP: Logged John Pytlak Film God Posts: 9987 From: Rochester, NY 14650-1922 Registered: Jan 2000 posted 02-25-2003 01:16 PM                        Consider mixing in some outside (unconditioned) air for the lamphouse cooling. Just not too cold or too damp. Use a HEPA filter to keep the air supply clean.  |  IP: Logged Andrew Lee Film Handler Posts: 99 From: Oakville, Ontario, Canada Registered: Jun 2002 posted 02-25-2003 02:00 PM                     I would also look at the specification of static or vacuum measured in "inches of water". This measurement is important and can easily be done with a manometer (tube filled with water and measured off in inches at the waterline). You can have the proper flow when measured at the lamphouse, but how much "power" does your exhaust system have to maintain this spec when everything is running and other exhaust vents are hooked up. I say this because sometimes flow measurements are made prior to equipment installation by the contractor. These measurements are then taken for gospel and in most instances are not what you are actually getting.  |  IP: Logged Peter Hall Master Film Handler Posts: 314 From: London, UK Registered: Dec 2000 posted 02-26-2003 11:20 AM                        900 cfm can "suck" the douser on a Super / Ultra 80 open ! We tend to put a independant 600CFM fan on the lamphouse - assuming the booth extract is >600 then all is well. If below the flue will get hot - otherwise a smoke test (in the booth - god forbid - are Marlboro Lights a tax deductable ?) will show up any extract probs..  |  IP: Logged

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