Welcome to the cannabis growing issues and help section. Use this section to ask about issues, deficiencies and other problems you encounter while growing cannabis. To become part of our online cannabis growing community click here to register.
Cooltubes suck :) literally! I'm being mean but it's true. You use energy due to the glass, they still get hot, they have a shit coverage footprint and require a shed load of air. You put a carbon filter on one end and it will slow down the fan enough to heat up the glass. And god help you in your fan fails. I've seen HPS bulbs where the fucking glass has melted and distort.
blowing through is always a better option. if you blow through, you create positive pressure in the ducting and light, so any smells get pushed out, inside the tent- as opposed to pulled in to the duct and out the tent, but if you have air tight ducting and a filter on the end you should be good. .
I disagree with everything blowing creates positive pressure, blows heat into the tent and smells get pushed outside the tent and into the room. You want negative pressure always.
These users thanked the author seymore_budz for the post:
Every single guide for using air cooled hoods will tell you the same, blowing through them is a much better option than sucking though them. if there is so much as a pin prick hole in the ducting, you are pulling unfiltered smell into the extract ducting, as the inside of the ducting is under negative pressure when sucking through them.
if you are blowing through them, it has positive pressure inside the duct, which will be higher than the air pressure in the tent, so it will blow out of any leaks, rather than suck in through any leaks.
how would it blow heat into the tent, it cant if its ducted from outside the tent.
the fan is also more efficient when blowing as there is less resistance.
This is moe applicable for air cooled hoods on a stand alone fan, but a filter isnt going to choke it to the extent it wont cool a couple of 600w HPS.
A mate of mine is running 4 of these from a stand alone fan 6 inchA1, and the last one is cool to the touch...
These users thanked the author bigbadbillybob for the post:
Every single guide for using air cooled hoods will tell you the same, blowing through them is a much better option than sucking though them. if there is so much as a pin prick hole in the ducting, you are pulling unfiltered smell into the extract ducting, as the inside of the ducting is under negative pressure when sucking through them.
if you are blowing through them, it has positive pressure inside the duct, which will be higher than the air pressure in the tent, so it will blow out of any leaks, rather than suck in through any leaks.
how would it blow heat into the tent, it cant if its ducted from outside the tent.
the fan is also more efficient when blowing as there is less resistance.
This is moe applicable for air cooled hoods on a stand alone fan, but a filter isnt going to choke it to the extent it wont cool a couple of 600w HPS.
A mate of mine is running 4 of these from a stand alone fan 6 inchA1, and the last one is cool to the touch...
I suppose it depends on how you set them up. Most I see use them are tent growers with one fan and they splice it in-between the fan and filter. That way you'd want the negative pressure. If you ran a dedicated fan and set them up correctly then I can see where you're coming from with the pushing.
I'm no extraction engineer but the efficiency between pushing and pulling is negligible right?
I've used them a few times. Once in a horizontal setup and they got taken out after the first run due to concerns and once in a vertical system because they were supplied with the system. The first ones were cool but as you went through the room they got pretty hot. I know they say the glass don't make a difference but the difference between the cooltube run and the eurowing run was crazy and the temperatures wasn't any different either.
Well, I’ve hooked it up. I was sitting at 30c with 250w. Now at 30c with a 400w. Still too hot but it’s not hooked up the best. Also, the fan is around 2-2.5 meters away from the filter up in the loft. It’s a 5inch A1 with a 500mm filter. Tomorrow I’ll go pick up an L1 and hopefully knock a few degree more off or is around 3c about as good as it gets?
If you want you can easily make an inline filter like this one. It sits outside the tent
It goes tentfilterfan, pull air through it
With the lid on and the foam sealer applied to the holes, it creates negative pressure so no chance of smell leaks
Make sure to get a tote with flat sides and not dipped like this one, it will be easier to work with
Sent from my LGMP260 using Tapatalk
These users thanked the author Josh for the post (total 2):
camkush (Tue Aug 18, 2020 6:50 pm) • Elias (Tue Aug 18, 2020 6:56 pm)
If you want you can easily make an inline filter like this one. It sits outside the tent
It goes tentfilterfan, pull air through it
With the lid on and the foam sealer applied to the holes, it creates negative pressure so no chance of smell leaks
Make sure to get a tote with flat sides and not dipped like this one, it will be easier to work with
blowing creates positive pressure, blows heat into the tent and smells get pushed outside the tent and into the room. You want negative pressure always.
filter
Discord
Links