fan for flowhood?
Posted 18 March 2006 - 12:43 PM
Posted 18 March 2006 - 05:23 PM
Start with the controls turned down way low. Put a lit candle in front of the HEPA (about 4 inches away) and turn up the speed control until the candle flame looks like this:
The candle flame should be almost horizontal when airflow is correct.
Here is a motor speed control, mounted in a weather proof box. I highly recommend getting a box with a cover to avoid accidentally changing the speed setting. AC fan speed control:
Never run an AC fan at less than %30-%40 power. You can damage the motor by running it too slowly.
Here is a thread on creating a laminar flow workstation from Rubbermaid tubs:
Posted 18 March 2006 - 07:34 PM
A proper speed control will vary voltage AND current simultaneously (motor speed controls use rheostats, not potentiometers). If you just vary voltage, you will get a lot of heat bulidup (and grease breakdown, and finally, failure) in the blower..
A light dimmer will work, but it will put a lot of extra strain on the blower.
Posted 18 March 2006 - 08:08 PM
PLEASE send us pics and success rates from your new hood...