what is the fabric dust capture velocity?

Question

I'm going to design fabric dust collector system for the Laundry.

Answer 1

Any filter (which is what you're actually designing, by the way) operates on the principle that if there are enough impediments to motion - either as discrete obstacles, or as sufficient changes of direction - then particles will be captured by the media forming the obstacle.

For every particle size and media 'opening', there is an upper limit to the velocity of air which will allow the particles to drop out and attach to the filtering material, instead of being pushed right on through by the air pressure.

The 'fabric dust capture velocity' would be one of two choices; either the absolute maximum limit for velocity as stated above, or the actual operating velocity you're intending for your screen.

In case you haven't figured it out yet, the slower the air passes through the filter, the better the filter is at catching and removing the dust from the airstream. Also, the smaller the openings (and the more tortuous the path is from one side of the filter to the other), the better the media is at trapping particulate.