[io_io]

I would guess that it works similar to a water pump- pushing is always more powerful than sucking - but check this out for some detailed analysis (and more data on DIY air filters) https://smartairfilters.com/en/blog/where-should-an-air-filt...

[patrioticaction]

I never would've guessed turbulent air would be more difficult to push but it makes total sense! Great find.

[ex_amazon_sde]

Excellent page.