Which Fan/filter combo for my room??

So I have turned a spare bathroom into my grow room, I was to run a system like this, Carbon filter-can fan-ducting-400w cooltube - ducting- 400w cooltube - ducting up the the bathroom exhaust opening in the ceiling.

The Bathroom is approx: 4 1/2 ft x 9 1/2 ft.

I found this fan/filter combo on amazon for $166 its a 4in:
http://www.amazon.com/Can-Filter-TD-Fan-Combo/dp/B001H3CV3S/ref=pd_sbs_k_2

Says, Ideal for rooms 8x8 or less, think it would be enough? There is a vent in the floor that the houses Central A/C will blow cool fresh air into the room.

SikSol said:

I found this fan/filter combo on amazon for $166 its a 4in:
http://www.amazon.com/Can-Filter-TD-Fan-Combo/dp/B001H3CV3S/ref=pd_sbs_k_2

Click to expand...

I'd be wary, because it doesn't state the fan CFM and it looks underpowered. You always want overkill, I'd say you need at least 400-600cfm for a decent sized bathroom with filters and especially a cooltube, it reduces a lot of that airflow.

save money on the filter by making one yourself, there are tons of guides online. I learned how to make mine here, it's probably the equivalent of a $250 600cfm filter I made for well under $80. Spend the extra money on a good inline duct fan. Elicent makes great ones, as do vortex etc