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Author Topic: Christie bulb spacer question Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 05-15-2005 10:29 AM                     I usually mount the blower right on the top of the lamphouse so that its suction is direcly coupled to the lamphouse and then a vent pipe to the central exhaust also that should have been 2.03" static not 203 i missed the decimal when I typed which is the static on 10' of 8" diameter aluminum flex duct  |  IP: Logged Brad Allen Jedi Master Film Handler Posts: 688 From: Evansville, IN, USA Registered: May 2000 posted 05-15-2005 11:23 AM                     Gordon, what blower do you use to mount directly to the lamphouse?  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 05-15-2005 11:38 AM                     Up here we use Delhi blowers and I usually put a 800cfm direct drive on the lamphouse top and then box it in with a 8" round outlet to connect to the exhaust system  |  IP: Logged Brad Allen Jedi Master Film Handler Posts: 688 From: Evansville, IN, USA Registered: May 2000 posted 05-15-2005 12:14 PM                     Thanks, been unable to find those blowers. But I assume it is an inline duct blower? In my situation, it would be very difficult to install the suggested Dayton blower in such a way as to easily get to it to maintain it....I'm looking at other options.  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 05-15-2005 12:21 PM                     The blower in question looks much like the one pictured by mark I usually mount it just behind the exhaust opening and then box it in with sheet metal and orient the vent out the top to a flex to a main flue  |  IP: Logged Brad Allen Jedi Master Film Handler Posts: 688 From: Evansville, IN, USA Registered: May 2000 posted 05-15-2005 12:56 PM                     Thanks Gordon, duh, I was making it too complicated.  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 05-15-2005 01:30 PM                     look at the pictures of the rainbow woodbine 8 in the warehouse  |  IP: Logged Brad Allen Jedi Master Film Handler Posts: 688 From: Evansville, IN, USA Registered: May 2000 posted 05-15-2005 02:22 PM                     Thanks. Do you mount the blower in rubber grommets to prevent vibration showing up in the picture?  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 05-15-2005 02:32 PM                     The blower is on rubber isolators  |  IP: Logged Brad Allen Jedi Master Film Handler Posts: 688 From: Evansville, IN, USA Registered: May 2000 posted 05-17-2005 12:20 PM                     I've ordered Marks Grainger blowers. A question, the blower has an 8" input, the lamphouse's have 6" vents. Will this reduce the air flow too much? As in overload the blower motor? Thanks  |  IP: Logged Alan Roehr Film Handler Posts: 3 From: Brookings, SD Registered: Dec 2004 posted 05-18-2005 11:03 PM                     Someone can correct me if I am wrong, but I think that the motor is under less load if the airflow is restricted and the blower is moving less air. So you shouldn't have to worry about overloading the motor, at least not because of the 6" duct. Also check the rotation as Mark said above. I just found that our blower was running the wrong direction - 5 years after it was installed. I reversed the rotation and now there is airflow! One thing I did notice is that there doesn't seem to be very many openings to let air into the lamphouse (old Christie CH-20). I think that limits the amount of air that can be moved through the lamphouse. The air that is sucked out of the stack has to enter somewhere.  |  IP: Logged John Walsh Film God Posts: 2490 From: Connecticut, USA, Earth, Milky Way Registered: Oct 1999 posted 05-19-2005 07:51 AM                     A suggestion is to use the largest vent you can. Like resistance in wire, going to a larger size wil reduce the effort needed by the motor. For example, even if the top of the lamphouse has only a 6 inch diameter vent, install larger ducting with an adapter (if you can.) Avoid bends where possible. Square ducting passes more air than the same size round duct. So, you might be able to go 'round' from the lamphouse to the ceiling, then square or rectangle the rest of the way. The manual for the lamphouse should state the required airflow. The next time a guy comes to work on the HVAC system, ask him to measure it for you. I went from an 8 inch to a 12 inch round up to the ceiling, then 18 square to the roof exhaust. Clear plastic venting allows the operators to see that the lamp is on, although plastic venting isn't always allowed in some local codes.  |  IP: Logged

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