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Author Topic: Exhaust Duct sources needed Steve Anderson Expert Film Handler Posts: 168 From: Nashville, TN Registered: Feb 2000 posted 08-07-2003 03:58 PM                        Barry, Louis put in a new lamphouse in our small theater,he used a square duct from the fan to the ceiling area then a piece of flex straight down to the lamphouse. Booth has been cooler since the install. So your at the stage of installing the booth equipment? That's great! .... Let me know if you need any help.  |  IP: Logged Barry Floyd Phenomenal Film Handler Posts: 1079 From: Lebanon, Tennessee, USA Registered: Mar 2000 posted 08-07-2003 04:37 PM                        Steve.... we're not installing equipment yet. Just trying to locate sources for last minute needs. The roof of the building just went on yesterday, and the interior has yet to be finished. We're not moving a thing in until we can lock down the building securely. We're shooting for an August 22nd opening date... but I'm still waiting on lenses to show up. We'll probably be moving in the weekend of the 15-16-17th.  |  IP: Logged Steve Anderson Expert Film Handler Posts: 168 From: Nashville, TN Registered: Feb 2000 posted 08-07-2003 05:04 PM                        Keep up the good work! New scope lens at the Franklin-DI wow what a difference! Hope you survived the series of storms the last few weeks. I stopped by a couple of weeks ago ....nice fence! Drive-In looking really good!!  |  IP: Logged Gordon Bachlund Jedi Master Film Handler Posts: 696 From: Monrovia, CA, USA Registered: Aug 1999 posted 08-07-2003 05:28 PM                        For a glimpse of the way some lamphouses were ducted in some of the theatres I worked in the 1950s and 60s, see "The Metro Theatre" pix dated 7/16 in "public additions" on the home page, except that most had a "pettycoat" type downdraft diverter at the end of the duct over the lamphouse vent, and, of course, a damper for balancing and controlling draft.  |  IP: Logged Andrew McCrea Jedi Master Film Handler Posts: 645 From: Winnipeg, Manitoba, Canada Registered: Nov 2000 posted 08-07-2003 11:43 PM                        So, Which would you guys suggest as the better idea? The Metal Duct The Flex Duct  |  IP: Logged Phil Hill I love my cootie bug Posts: 7595 From: Hollywood, CA USA Registered: Mar 2000 posted 08-07-2003 11:49 PM                  Andrew: See the above posts for the pros & cons... >>> Phil  |  IP: Logged Adam Martin I'm not even gonna point out the irony. Posts: 3686 From: Dallas, TX Registered: Nov 2000 posted 08-08-2003 12:51 AM                     Gordon briefly mentioned this earlier, but it's worth noting: Keep the changes in direction to a minimum. The straightest shot possible will draw more airflow by increasing the efficiency of the motor and reducing turbulence. Very important for higher-power lamps. And don't forget to seal the joints.  |  IP: Logged Barry Floyd Phenomenal Film Handler Posts: 1079 From: Lebanon, Tennessee, USA Registered: Mar 2000 posted 08-08-2003 09:09 AM                        Looking over my choices, I might end up going with a 14" x 14" square duct, (Insulated duct-board) and then dropping an 8" flex from the ceiling to the lamp and then find a 6" x 8" reducing collar.  |  IP: Logged Ken Layton Phenomenal Film Handler Posts: 1452 From: Olympia, Wash. USA Registered: Sep 1999 posted 08-08-2003 09:25 AM                     Good idea, Barry. That 8" duct may come in handy if you upgrade to a bigger or different lamphouse. Most of the lamphouses in the 3,000 to 4,500 watt variety have 8" hole in the top of the lamphouse.  |  IP: Logged Phil Hill I love my cootie bug Posts: 7595 From: Hollywood, CA USA Registered: Mar 2000 posted 08-08-2003 09:27 AM                  Barry, also make sure you have a "rain loop" in the path so as not to allow any rain storms to get H2O into your lamphouse. Oh, and bee hives! >>> Phil  |  IP: Logged Gordon Bachlund Jedi Master Film Handler Posts: 696 From: Monrovia, CA, USA Registered: Aug 1999 posted 08-08-2003 10:15 AM                        Geez, Phil, now you've spoiled the surprise!  |  IP: Logged Andrew McCrea Jedi Master Film Handler Posts: 645 From: Winnipeg, Manitoba, Canada Registered: Nov 2000 posted 08-08-2003 11:39 AM                        Barry, I think the idea of that big duct with the 8" drop down is a good idea. In a multiplex, could you have, lets say, all 8 lamphouses hooked up to that big duct with the drop downs, and have one mega machine, or should each house have its own machine? As to the straight down awnser, is the metal duct or the flex duct the one that should be used? Thanks, Andrew  |  IP: Logged Barry Floyd Phenomenal Film Handler Posts: 1079 From: Lebanon, Tennessee, USA Registered: Mar 2000 posted 08-08-2003 12:34 PM                        Phil suggested a "rain loop" in the duct line somewhere. Would I need this even if the exhaust fan will be a side-wall mount? I'll be using a "downblast" fan with a "mushroom" looking hood over the top. The fan itself will be wall mounted directly under the overhanging eve of the building. Since the 14" x 14" duct will be up above the ceiling, I could slope it up 4" - 6" on the far end, so if any rain did make it past the fan, it would all collect on the opposite end from the projector and lamphouse.  |  IP: Logged John Pytlak Film God Posts: 9987 From: Rochester, NY 14650-1922 Registered: Jan 2000 posted 08-08-2003 01:04 PM                        Don't forget to screen the output of the vent to keep critters (birds, squirrels) and insects (bees, wasps, and hornets) out. And keep the screen clean so as not to obstruct the airflow.  |  IP: Logged Jack Ondracek Film God Posts: 2348 From: Port Orchard, WA, USA Registered: Oct 2002 posted 08-08-2003 01:13 PM                        quote: In a multiplex, could you have, lets say, all 8 lamphouses hooked up to that big duct with the drop downs, and have one mega machine, or should each house have its own machine? Sure... you can do it both ways. A couple of shopping centers around here use that single (master) blower concept. Personally though, I wouldn't design a system that way if I had the option. That blower would represent a single failure point that could take down the whole operation. We recently learned the value of separating systems when one of our power supplies spiked the main breaker feeding a load panel. Because each of our screens has its own breaker board, only the one screen went down.  |  IP: Logged

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