fresh air intake

Here is my dilemma, My rooms both total about 14x 16 feet. I want to build a box to mount a HEPA filter in close to the floor to get fresh air from my shop, which takes up the rest of my building. I want bring it in from my shop, because in the winter I keep my shop at a minimum 40 degrees, when outside air can reach colder then 20 below zero. But when I work in my shop I creat VOCs ( Chemical vapor) which I don't want to induce into my grow room. So do I filter the air with a HEPA filter, then use a $1200. purifier once it is inside. Or is there another way? No I am not relocating! How about building something so all the air coming in goes through the purifier and hook it up to my ventilation fan so when it is sucking out the hot air the purifier is blowing in cool clean air?
this has me thinking to hard

If you have VOC's in the air you are not going to scrub all the pollutants out wihout some exspensive, high tech air scrubbing. If you are painting or welding there will be carbon monoxide, Chromium compounds, and other nasties in the air. Very difficult to remove all those with simple filters, sorry. Even Carbon scrubbers would become quickly plugged and rendered useless.

Seems like it would be easyer to build a heat box to run outside air in.

stumps said:

Seems like it would be easyer to build a heat box to run outside air in.

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Would running uninsulated aluminum duct from the opposite side of the building around my ceiling to the grow room heat it up enough? I would end up with about 40 feet of duct work if I followed the perimeter.

seems like it would be cheaper and easier to mount a heater near the air intake from the outside to compensate for the temperature. a cheap little space heater that points right at the intake and mixes the heat with it right at the point of entry so you dont have two extremely different temps in the room. idk i've never done anything like that it's just an idea that seems like it would work.

don't know if just the ducting would be enough is it's -20 outside. If your shop gets down to 40 it's not going to warm much.