Filtration for HVAC

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Forum topic by agallant posted 01-05-2016 06:04 PM 616 views 0 times favorited 4 replies Add to Favorites Watch
View agallant's profile


551 posts in 2913 days

01-05-2016 06:04 PM

4 replies so far

View MadMark's profile


979 posts in 1479 days

#1 posted 01-05-2016 06:33 PM

Ok, so you’re going to an enclosed system with the garage door closed (or otherwise inside).

You DC exhaust needs to go into a .5 micron bag. The nasty stuff is in the 1-5 micron range. You don’t want that floating in the air. That should reduce the fine dust to a minimum. Just vac up the big chunks into the separator and let the .5 micron bag do the rest. There will be dust. Vacuum often. My AC unit has a ‘filter dirty’ light. Listen when it speaks.

Have fum!


-- Madmark -

View woodwringer's profile


4 posts in 898 days

#2 posted 01-05-2016 06:46 PM

Most minisplits have a woven monofilament filter that is washable. Because they usually have a curved front, I can’t think of an easy way to add more filtration. You might be able to build a box that would cover the entire unit with a filter at the top and an opening at the bottom that seals around the air outlet louvers, but you should be able to get by just washing the filter often.


-- Woodwringer

View Matt Rogers's profile

Matt Rogers

110 posts in 1996 days

#3 posted 01-06-2016 01:07 AM

I just installed a Mitsubishi minisplit in my shop. I have central dust collection with a cyclone located outside the building, but I don’t always turn it on unless I am doing a lot of work. My unit sucks air in at the top, which is flat. I just placed a piece of cut-to-fit air filter material on the top and it acts as a pre-filter to take most of the dust out of the air before it goes into the unit. I was going to build a box around the unit, but I can’t see it being that much better than placing an extra filter over the inlet. I also have a remote on the wall and shut off the unit when I make a lot of dust – just a press of a button before and after I sand or cut some material. I could set it to only run at night when there is not be dust floating around inside. It has only been operating for a week, so I have yet to see how it will all work out, but it is certainly a lot better than a cold shop. I love having heat.

-- Matt Rogers, and

View Jim Finn's profile

Jim Finn

2658 posts in 2948 days

#4 posted 01-06-2016 02:34 PM

I have two window units in my dusty shop which is very similar to the, through the wall, unit only a LOT cheaper. I made a simple shelf in front of the air inlet and set a pleated filter in it. Still some dust gets inside the unit so I occasionally clean the coil with coil cleaner from Lowes. My dust collector exhausts outside.

-- Website is No PHD just a DD214 and a GED

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