Air quality

Hello. My grow room is going to be in my crawl space. I plan on pulling air from crawl space into grow room. Trouble is the air is stale. So I’m wondering if I can put a fan in crawl space to circulate air and use a hepa filter to filtrate the air going into grow room. Would this work?

What's a crawl space ?

Pictures

A crawl space is an excavated area of dirt under a living space of a dwelling, unlike a basement with a foundation. I would not be drawing air from a dirt crawlspace. They tend to be prone to moisture, mold, mildew, vapors, odors and radon. No bueno. YMMV

I’m not sure how much clearance you will have as it runs 18“ minimum .

Why not a simple closet grow or 2x2 tent for starters ?

Why not use a grow tent in a room or closet, use the room itself as the "intake" air and exhaust it into the crawlspace?