Thanks for the heads up bigsby.

I will put in an order for the best carbon filter I can find as soon as possible.
Hopefully it will be good enough to let me keep the warm air. Do you think it would be possible to buy a filter this good ? Or will I have to vent also ?

I am now down to 6 plants after spotting 3 males. I cut down 2 so far and gave the last one a bit more time to be sure.
I must have a look at some of your grows on here if you have any. Can you give me a link to a good one ?
Im sure I made a very good choice in the Pro-Grow 260. The plants are loving it.

Ill get on to that carbon filter within the next few days.

Thanks again for your advice

Take care.