|
|
|
| Home » Knowledge Base » Knowledge Base Article | Login | Become a Member | What's New | Site Map |
|
WOODWEB DISCLAIMS any and all RESPONSIBILITY and LIABILITY for the accuracy and application of the information below. Readers agree to evaluate the significance and limitations of the information provided, and accept full responsibility for the application of this information. Read More ... |
|
|
Would you like to add information to this article? Interested in writing or submitting an article? Have a question about this article? Dust Collector Pressure and Suction 
Question
Forum Responses
From contributor D: The biggest problem with negative air pressure is if you have any type of combustion heating (i.e. gas or propane) in your shop. Negative air pressure would suck fumes back down the chimney into your space, and that would be very bad. If no heating is involved, the only other problem I could imagine is if there is not enough air being returned to the shop. Then the collector may not work to its full potential, as it is having to work increasingly harder to get air out. Imagine sucking on a straw where one end is in an airtight container. That's kind of what would be happening on a much bigger scale. As for adding a cyclone inline, I think that's your best bet for chip removal. The other reason to do some research is, you'll want to calculate how much cfm you'll lose with your ductwork. You may find after all this, your collector is not quite up to the challenge of getting all the dust out.
From contributor L: If you don't have either return air or an opening to the outside for air makeup, you will find the shop door slams really hard! I can't see that going to one 6" over two 4" is going to change much. The cross sectional area of the ducts adds up to about the same, so the velocity would be about the same. For a cyclone to work well it needs to be sized to match the air velocity. Too small and you will have too much loss, too big and you will get poor separation. From contributor B: Are you having a problem with insufficient suction? I have a similar setup to you and was having a sufficient suction problem, most noticeable on my planer. At the time I was using plastic blast gates. I went through the entire system checking for possible locations for air leaks. This included where the 4" goes into the cyclone top above the garbage can. I duct taped and sealed all locations for possible vacuum loss and switched from plastic to metal blast gates. System works great now with no issues. You may want to take these easy steps before doing something more drastic. Also make sure your blast gates are closing completely and not hanging a little open due to clogs. Have you reviewed the related Knowledge Base areas below? 
|
