Thread: Vacuum&pressure pot experiments

Dust control is important. I am a little put off by our cold weather, because my dust collector is outside my work shop it takes about three minutes for the inside temperature to drop to match the outside temperature.

Looks great there Mike. Seems to look solid enough

Originally Posted by RezDog

Dust control is important. I am a little put off by our cold weather, because my dust collector is outside my work shop it takes about three minutes for the inside temperature to drop to match the outside temperature.

I have not done this but this post got me thinking. Would it be worth trying to get a flexible duct for outside fresh air intake that could be put near the saw/dust collector inlet so that when the cold outside air was drawn in it would be exhausted right back out again rather than the heated air?

I suppose it should help but I can't help but think it that the best long term solution is to plumb the exhaust air back into the building and filter it with the two four foot long hepa filters that I keep tripping over. I need to get some tin work made, and we are a little light on those services here. I never really give it too much though until it gets cold out.

Originally Posted by RezDog

I never really give it too much though until it gets cold out.

That sounds a lot like myself.

But then I just looked and it isn't even cold there!

I converted our house's old Electrolux central vac into my dust collector in the basement. Disconnected all the original house duct work and ran a new line to a cyclone separator bucket then to the hose I move machine to machine as required.
Works well and I barely hear anything inside, but the neighbors hear the head unit in the garage so I don't use it after ten pm.

The problem with ducting cold air in and near the exhaust would be it would reduce the effectiveness of the system for its primary use. So like if it's a 650 cfm exhaust fan and you supply 400 cfm of outside air to its inlet side, it'll only remove 250 from the room. At least that's the way I figure it.
Ideally, recirculating the room through a hepa or bag set up would be the best for heat preservation but I don't like a noisy shop so went with my remote blower idea and pay the gas bill accordingly, lol.
I tell the wife the gas bill went up cause of drafty windows, so moms the word gents...

I don't think that my idea would reduce the dust collectors overall effectiveness.

Use a table saw for example. The dust collector sucks from under the blade. I am sure that everyone here uses an anti kickback guard over the blade..... Drill holes through the guard and build some kind of adapter for a flexible fresh air intake duct at the top of the guard. The cold air would enter at the top of the blade and exit at the bottom one foot or so away only cooling that part of the room.

Just another of my random thoughts!

That's true and yup, think you are right, if the cold air is above the saw, totally would work as you suggest.
Was thinking more about the math than the physics,

Originally Posted by 32t

I don't think that my idea would reduce the dust collectors overall effectiveness.

Use a table saw for example. The dust collector sucks from under the blade. I am sure that everyone here uses an anti kickback guard over the blade..... Drill holes through the guard and build some kind of adapter for a flexible fresh air intake duct at the top of the guard. The cold air would enter at the top of the blade and exit at the bottom one foot or so away only cooling that part of the room.

Just another of my random thoughts!

That is exactly what I am working on for my basement shop. Despite accessory air filtration, there will be heck to pay if I create any dust in the house given my wife's sensitivities, so my air system has to discharge outside. For that reason I intend to have as much of the dirty air be the cold air that just entered the house for the buffers and the inside grinder.