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not... strictly true. i have a stealth grow going with a pc 120mm fan pulling through a small yet effective custom built carbon filter. temp in grow room DROPPED, indicating air movement. and when you put ur hand up to the filter you can feel air being drawn. activated carbon layer does not...

lol thats the UK for you.

this is in a country where its illegal to grow, lol. standard house loft.

i have a 400 dual spectrum light going at the moment. outlet pc fan (120mm) running directly into loft (no pipe, but has activated carbon filter). i have an inlet duct as well (5 metres but 1.5 metre stretched out in loft), cold air breezes out of it which makes me think cold air is moving...