Well lads and ladies, Im having trouble cooling my grow space. I have always had a problem but thought by buying a bigger fan it would fix it but apprantly not. I dont know the exact measurements of the grow space of the top of my head but its roughly 18x24x71 inches. I use a 250w hps I used to use a 120cm pc fan for extracting and had either passive intake or another pc on the intake and that never really got my room cool enough but i could grow. This time round i went with a proper 4inch inline fan that was rated more than what i needed. Have it all hooked up now and its no better than the pc fan, my temps are between 28c and 32c with the new fan. This is the fan i bought, eBay: eBay Where am i going wrong.?
That looks like an awfully cheap fan you bought there. We run 2 6" inline fans and ducting that pull the heat off 4 1000 watt hps bulbs through air cooled hoods. When working in a confined space, the heat issue is tougher to deal with. I doubt your fan is producing the CFMs it's rated for and you probably should've gone with a good quality 6" fan. HPS lighting just gets HOT and the smaller the space you're using it in, the hotter it's going to get. You need good air movement in and around your plants at all times in addition to the in line fan and ducting pulling the heat off the light/bulb. I would go up to a 6" fan and return that one if possible. Regardless of what you have to do, you have got to get the temps in there down. If you get to the mid 80's (we use F (LOL)) and up, your plants are really going to show you they're not happy. TWW
Im not the richest man going, it was the cheapest inline i could find here in ireland, is there a way a way of messuring the cfm.? I can feel it sucking and blowing the air hard. I cant return it as it was bought well before xmas as a gift from my missus
That should be plenty of air flow for that space, even on the low speed it should be enough. 220 m3/hr = roughly 130cfm, 160 m3/hr = roughly 95cfm. But you didn't say where your intake / exhaust are coming from / going to. If your intake / exhaust are both coming from the same room as your grow tent and you are not keeping that room in the low 60'sf / 18.3c or lower, you will never be able to keep your grow room in the mid 70'sf / 23.8c when the 250w hps is on.
