I prefer to avoid using ducting but 6" of it is no never mind. I hang the fan first, then hang the filter so that it matches up with a gap of a few mm. Then I tape them together.
When you open the tent/cab, some odour spills out. Unless you have gone well ott with the extraction. If you have one exchange of air per minute, that's for the tent, not the entire room. Hence it will take a few minutes for all the spilled odour to be drawn back into the tent.
If there is no odour anywhere except the groom, all is well.
The only thing I would add is when the fan cycles, very often if you have a controller, the material of the ducting will also cycle.
Its only a matter of time before it yields. Bending a paper clip, comet plane fuselages come to mind.
On the exhaust side there is much less cycling than on the vac side since the pressure differential is less.
Farmer Geddon (12-02-21), GEORGE (12-02-21), Krato (12-02-21), Mac (12-02-21)
Hi Farmer Geddin
Thank you for your reply, since you have written this post I have went up sealed all joints with duct tape and secured with jubilee clips but what I found I couldn't believe and found it by pure fluke.
There was actually air being pushed out from the housing on my fan, I wrapped it in duct tape and made sure anything wasn't escaping closed the tent up and went for a smoke came back and put my hand round the cf and it was actually pulling more air in.
Couldn't believe it
Farmer Geddon (13-02-21), GEORGE (12-02-21), Mac (13-02-21), M_C (12-02-21)
Farmer Geddon (13-02-21), GEORGE (12-02-21), Krato (12-02-21), Mac (13-02-21)
Last edited by M_C; 12-02-21 at 11:45 PM.
Farmer Geddon (13-02-21), GEORGE (12-02-21), Mac (13-02-21), M_C (12-02-21)
I used to think that was down to me changing the grow setup every few years and giving my rvk fans a hard time. Then I set up a loft grow for a mate and his rvk leaked too. As you can see from the green tape in the pic.
With my cupboard grow, the fan pushes into the filter so leaks are more likely to cause odour problems. For the first few days I spent many hours standing on top of my stepladder trying to get bits of tape in the correct place. It is an awkward position as I only have access to one side of the fan and filter.
If it's just a little bit of air escaping, any odour will dissipate soon enough. For extraction, my cellar has a 6" rvk fitted to an airbrick. No filter as I need to leave it running even when not growing or the cellar gets musty. (I also use it as a workshop.) For odour control, I had an 8" rvk + filter close to the plants used as an air scrubber, no ducting. Powerful enough to only leave a slight odour in the cellar. Outside, if I get my nose within 2 feet of the airbrick, there's a slight smell of weed. 3 feet away and nothing. Not ideal but I doubt anyone is going to be kneeling down sniffing airbricks, Except me of course.
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