Hi all. First post so i`ll try not to make a fool of myself.......

I am in the loft with a homemade 5m3 grow room.

I am using a 6" fan for intake air (from the loftspace) but would like to get better fresh air if possible.

I have a 2" pipe thru my gable end wall (which used to be for an en-suite waste water but no longer used).

I`m wondering what would happen if i connected the 6" ducting from the intake fan and formed a good seal onto the 2" pipe then would the fan still be drawing the same amount of air into the grow room.

Is air flow determined purely by fan...... I say yes (within reason), what says you my freinds????????