Your D. E. filter elements or grids have holes in them. Shut down the system, making sure it will not come on while you work on the filter. Remove and clean the grids and inspect for holes. Replace those units that are damaged, reassemble with a new tank gasket and test. With the system running, recharge the filter with the proper amount of D.E.
Ken
The vacuum cleaner pushes out all of the air particles in the dust tank in it, forming a small vacuum, which pulls on to small weighting objects like dust, which gets absorbed into the tank, and can't go out because it is big to filter through holes like air particles do.
Hard to say it really depends on your home. One thing it will do if you have a filtration system in your furnace will ensure you have cleaner air blowing through the house.
suspension particles can be seen through a microscope
blowing through a straw,air touches the walls of the straw and makes the it vibrate and as it is a light body it makessound
Free blowing means that the trumpet doesn't feel stuffy when you play it. I'm not really sure how to explain it, other than comparing this: imagine blowing air through a soda straw, then blowing air through a water hose. The water hose is bigger and will allow you to blow larger amounts of air through it.
Yes they do need particles to travel through!
you have a vac. leake or the oneway check valve is not working.....
The wind you create by blowing through it whistles through the holes in different ways depending on the ones you cover. The holes create the sounds - otherwise it would be similar to blowing through a straw.
Direct Connection, Connection Through an Integrated Router, and a Connection Through a Gateway Device.
Sound, unlike light, needs a medium through which to travel. Sound relies on vibrating molecules or particles. Sound can travel through air at about 3 km/s as it vibrates particles and then the neighbouring particles etc. but it can travel much faster through steel because the particles are much more tightly packed.In outer space there are not enough particles to vibrate, no neighbouring particles for the very few particles that are there. No particles means that there is no sound.
Draft
blowing through a reed