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This topic comprises 3 pages: 1 2 3
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Author
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Topic: exhaust requirements for followspots?
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Scott Norwood
Film God
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Posts: 8146
From: Boston, MA. USA (1774.21 miles northeast of Dallas)
Registered: Jun 99
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posted 09-01-2002 12:22 PM
This isn't exactly "film" related, but hopefully someone can help.What type of exhaust sytem (if any) is necessary for carbon-arc Super Trouper followspots when used indoors from a theatre balcony (i.e. not in an enclosed booth)? Do the require a special exhaust system like film projector lamphouses do, or is it safe to operate them for short periods (probably 10-15 minutes max. for pre-film introductory speeches, etc.) in a 900-seat theatre? I've seen the arc Troupers used without ventilation in outdoor and large-venue (basketball arenas, etc.) environments without ventilation, but have only seen the xenon models used in theatre environments (also without ventilation). One or two Super Troupers will (hopefully) be replacing a rather wimpy 1000w incandescent followspot in the near future....
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Paul Mayer
Oh get out of it Melvin, before it pulls you under!
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Posts: 3836
From: Albuquerque, NM
Registered: Feb 2000
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posted 09-01-2002 02:30 PM
For years (1968 - ca.1980) at the Las Vegas Hilton we ran carbon short-throw Super Troupers and the occasional 35mm w/Magnarc from the balcony and box booms of the 2200-seat main showroom without real venting. I'm sure OSHA would have a fit if we ran carbon like that now. All we did for venting was to secure a 4-5' section of hose to the lamphouse and drape it over the backside pointing down. The spots operated for 1-1/2 to 2 hours per show, 14 shows a week with no complaints from the audience seated around us (of course in those days smoking was allowed in all showrooms here--which pretty much masked any carbon soot or odor problems). Obviously we had regular maintenance calls to clean the hose and carpet.So, can you get away with running carbon like that for the occasional 10-15 minute stint? More than likely. Is it safe? By today's overly-protective standards, probably not. You may want to rig about 8' of hose such that it drapes over the back side of the lamp down to the floor and terminate it in a box with a damper, filter, and blower in it. Don't know the cfm needed for those lamps but it isn't much. BTW congratulations on obtaining those spots. When properly maintained and operated they put out a beautiful light. I'm surprised one can still get carbons for them. Spare parts will be a problem though--here in the Neon National Forest the local Strong parts dealer gave away all their carbon-arc spare parts years ago. As always, have fun! Paul
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Paul Mayer
Oh get out of it Melvin, before it pulls you under!
![](http://www.film-tech.com/ubbmembers/355b.jpg)
Posts: 3836
From: Albuquerque, NM
Registered: Feb 2000
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posted 09-01-2002 08:29 PM
IIRC 6x9 for the negatives and 7x12 or 7x14 for the positives. If your positive jaws have the stop pin in them you'll have to use 7x12 or shorter, or break off the last couple of inches of 7x14s.Never saw anyone here use carbon savers in those lamps. Since it only takes a few seconds to shut down and "stretch" the carbons, no one bothered with savers. In a live show one can always find a moment to go out and stretch. You should be able to get around 1+20 to 1+30 burning time on a fresh trim. For 10-15 minute burns you'll easily be able to burn stubs. Paul
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William Hooper
Phenomenal Film Handler
Posts: 1879
From: Mobile, AL USA
Registered: Jun 99
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posted 09-02-2002 12:22 AM
Kicking some unwanted roommates out of the projection booth, Scott?I've only seen them just vented to the room. I think it would be best to get something to scrub them with, though. Trapping the ash really shouldn't be much of a problem, it's pretty big. You could bend some sheet metal & build a little filter box with some cut to fit window AC filter foam sheets & a muffin fan. What bothers me is C + O2 -> CO2 Even when they were just dumped to the projection booth, the booths still had lots of exhaust for the room.
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