Hi am i rite that i need a small inlet than the extractor like i have a 125mm extractor so 100mm inlet would be good in a 1.2x1.2x2 m tent the thing is were is it best to put the ducting for them both jt with out putting them out tge window? And its not possible to put holes in the wall i were thinking if i get the extractor ducting in the loft and tge inlet running along the floor but close to the window. Window will be open all the time Just want to know what other peps think and if they do it a better way with out makong holes in the wall But i do need tgem as my temp is 86f thats on a 400w metal but ones the 600hps goes in then its gona go really higher