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Author Topic: Exhaust Duct sources needed Barry Floyd Phenomenal Film Handler Posts: 1079 From: Lebanon, Tennessee, USA Registered: Mar 2000 posted 08-06-2003 10:29 AM                        Our Xenex II Lamphouse has a 6" outlet on the top for the exhaust duct, and I need to find a source for the actual duct itself. I don't want to use standard "flex duct" like you use on HVAC stuff, but a flexible rigid metal duct. What do you guys use, and where can I get some??  |  IP: Logged Ken Layton Phenomenal Film Handler Posts: 1452 From: Olympia, Wash. USA Registered: Sep 1999 posted 08-06-2003 10:36 AM                     You can get the flexible aluminum ducting at Home Depot.  |  IP: Logged Gordon Bachlund Jedi Master Film Handler Posts: 696 From: Monrovia, CA, USA Registered: Aug 1999 posted 08-06-2003 06:16 PM                        And, if a Home Depot or Loews is not handy, McMaster-Carr and Granger are reliable sources and will accept phone and internet orders.  |  IP: Logged Phil Hill I love my cootie bug Posts: 7595 From: Hollywood, CA USA Registered: Mar 2000 posted 08-06-2003 07:07 PM                  I would use the least amount of flex duct as possible. Use straight rigid ducts as much as possible right down to within a few inches of the lamphouse. The flex ducts severly restrict airflow and induce internal turbulance. >>> Phil  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 08-06-2003 08:10 PM                     I generally use flex for a minimum of 3-feet with celing line to lamphouse as typical. Home Depot does have the "semi-rigid" duct. My preference is definately insulated though. Steve  |  IP: Logged Chris Markiewicz Expert Film Handler Posts: 209 From: Glenaviegh, County Tipperary, Ireland Registered: Aug 2002 posted 08-06-2003 09:26 PM                     I agree with everyone above. Another source for flexible metal ducting is a woodstove supply dealer. We have stainless flexible and rigid piping in my mom's house.  |  IP: Logged Bruce McGee Phenomenal Film Handler Posts: 1776 From: Asheville, NC USA... Nowhere in Particular. Registered: Aug 1999 posted 08-06-2003 09:35 PM                     Any good heating supply house in the Nashville area will have rigid 6" duct pipe in 3', and 5' lengths. 6" elbow pipes are fully adjustable. 24ga metal is the best. It's used as flue pipe on furnaces, etc. 30ga is thin. It is used mostly in HVAC ductwork. I agree with not using flex aluminum. Holds the air back! Use self-tapping sheet metal screws when you attach the pipes and elbows together.  |  IP: Logged Greg Mueller Phenomenal Film Handler Posts: 1687 From: Port Gamble, WA Registered: Jun 99 posted 08-07-2003 09:23 AM                        I went to Home Depot and got 6" rigid duct and then one piece of flex duct too. I mounted the rigid up in the ceiling between the rafters and went from that to the lamphouse with the flex. I got 2 inline helper fans from McMaster Carr for about $30 each and have them wired to a switch on the wall. Now the rigid pipe sucks and the lamphouse blows.  |  IP: Logged Barry Floyd Phenomenal Film Handler Posts: 1079 From: Lebanon, Tennessee, USA Registered: Mar 2000 posted 08-07-2003 09:57 AM                        Would you guys suggest to get a 6" x 8" adapter, and run 8" all the way up to the exhaust fan or keep it 6" until I get to the fan? One of the other drive-in owner's suggested I transition from 6" up to 8"??? I want to make this a clean as possible installation.  |  IP: Logged Greg Mueller Phenomenal Film Handler Posts: 1687 From: Port Gamble, WA Registered: Jun 99 posted 08-07-2003 10:03 AM                        The bigger the pipe the less "wall turbulence". I guess size depends on how many kw you are running.  |  IP: Logged Andrew McCrea Jedi Master Film Handler Posts: 645 From: Winnipeg, Manitoba, Canada Registered: Nov 2000 posted 08-07-2003 10:30 AM                        I know a company called "Dundas Jafine" that makes ducts, adpaters, etc. Check it out: http://www.dundasjafine.com Andrew  |  IP: Logged John Pytlak Film God Posts: 9987 From: Rochester, NY 14650-1922 Registered: Jan 2000 posted 08-07-2003 11:02 AM                        Welcome back to Film-Tech Andrew! (Hopefully older and wiser. )  |  IP: Logged Barry Floyd Phenomenal Film Handler Posts: 1079 From: Lebanon, Tennessee, USA Registered: Mar 2000 posted 08-07-2003 11:11 AM                        Good to see you back Andrew. I'm running 4kw... with a water cooled gate  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 08-07-2003 12:05 PM                     Every elbow every turn adds what is called static pressure to the system. The size of the exhaust fan and the motor horsepower needs to based on the volume of air required to be moved at a given velocity and at what static pressure I usually use a square duct from the fan to the ceiling area above the lamphouse and then a piece of flex straight down to the lamphouse A bypass damper at the juntion of the flex and the duct will allow the contractor to balance the system for the desired airflow  |  IP: Logged Marc Jones Film Handler Posts: 82 From: Elizabethtown, KY Registered: Jun 99 posted 08-07-2003 12:20 PM                     look at http://www.mcmaster.com/ thanks  |  IP: Logged

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