Humidity in the sub-tropics

[bushbob]

I might be looking at getting a couple more grows done in my current space and I want to see what I can do about controlling the humidity in the room better.
I was thinking I could seal the room better using a plastic dust sheet with a zipper, similar to this. The extraction fan is exhausting out the window using one of these window kits and doesn't have much of a seal but is pretty snug in its setting. I was thinking it could probably be improved using a foam seal tape but I'm not sure if it's necessary.
I would think that with the dust sheet taped in place that the extraction fan would work better, creating more suction and drawing more fresh air in through any gaps in the room's seal.
That is about as much as I can think of to address sealing the room. The enclosed area would be 21.2 cubic meters.
I'll also be looking into getting a dehumidifier, probably this DeLonghi or something similar. If the extraction fan flow is 410-530 cM/hr and the dehumidifier is 134-195 cM/hr, is there much of a point of using the dehumidifier if the treated air is being extracted faster than its being produced?

Also of note, the flood and drain trays periodically flooding cause unavoidable spikes in humidity. Obviously a dehumidifier would help address this issue but I was wondering if maybe a better sealed room coupled with the extraction fan would potentially do the job as good as using a dehumidifier.

I have never used a one before. Do they kick in when the humidity goes above a set level or do they run continuously? Not too keen on the added power usage but if it only kicks in when it needs to and improves my yields/eliminates my mould problem I suppose it's worth it.
How much heat does a dehumidifier tend to add to the environment? And can the water produced be drained into a hydroponic res without the PH getting out of wack?

Any advice/tips on controlling humidity and mould in high humidity climates would be much appreciated.

 

[Kee Mao]

I might be looking at getting a couple more grows done in my current space and I want to see what I can do about controlling the humidity in the room better.
I was thinking I could seal the room better using a plastic dust sheet with a zipper, similar to this. The extraction fan is exhausting out the window using one of these window kits and doesn't have much of a seal but is pretty snug in its setting. I was thinking it could probably be improved using a foam seal tape but I'm not sure if it's necessary.
I would think that with the dust sheet taped in place that the extraction fan would work better, creating more suction and drawing more fresh air in through any gaps in the room's seal.
That is about as much as I can think of to address sealing the room. The enclosed area would be 21.2 cubic meters.
I'll also be looking into getting a dehumidifier, probably this DeLonghi or something similar. If the extraction fan flow is 410-530 cM/hr and the dehumidifier is 134-195 cM/hr, is there much of a point of using the dehumidifier if the treated air is being extracted faster than its being produced?

Also of note, the flood and drain trays periodically flooding cause unavoidable spikes in humidity. Obviously a dehumidifier would help address this issue but I was wondering if maybe a better sealed room coupled with the extraction fan would potentially do the job as good as using a dehumidifier.

I have never used a one before. Do they kick in when the humidity goes above a set level or do they run continuously? Not too keen on the added power usage but if it only kicks in when it needs to and improves my yields/eliminates my mould problem I suppose it's worth it.
How much heat does a dehumidifier tend to add to the environment? And can the water produced be drained into a hydroponic res without the PH getting out of wack?

Any advice/tips on controlling humidity and mould in high humidity climates would be much appreciated.

I would be looking at the strains that can tolerate your weather conditions. Most of the weed search engines will let you narrow down for mould and or high RH. Thai strains would go ok,but you’d be in flower forever.

 

[Porky]

I might be looking at getting a couple more grows done in my current space and I want to see what I can do about controlling the humidity in the room better.
I was thinking I could seal the room better using a plastic dust sheet with a zipper, similar to this. The extraction fan is exhausting out the window using one of these window kits and doesn't have much of a seal but is pretty snug in its setting. I was thinking it could probably be improved using a foam seal tape but I'm not sure if it's necessary.
I would think that with the dust sheet taped in place that the extraction fan would work better, creating more suction and drawing more fresh air in through any gaps in the room's seal.
That is about as much as I can think of to address sealing the room. The enclosed area would be 21.2 cubic meters.
I'll also be looking into getting a dehumidifier, probably this DeLonghi or something similar. If the extraction fan flow is 410-530 cM/hr and the dehumidifier is 134-195 cM/hr, is there much of a point of using the dehumidifier if the treated air is being extracted faster than its being produced?

Also of note, the flood and drain trays periodically flooding cause unavoidable spikes in humidity. Obviously a dehumidifier would help address this issue but I was wondering if maybe a better sealed room coupled with the extraction fan would potentially do the job as good as using a dehumidifier.

I have never used a one before. Do they kick in when the humidity goes above a set level or do they run continuously? Not too keen on the added power usage but if it only kicks in when it needs to and improves my yields/eliminates my mould problem I suppose it's worth it.
How much heat does a dehumidifier tend to add to the environment? And can the water produced be drained into a hydroponic res without the PH getting out of wack?

Any advice/tips on controlling humidity and mould in high humidity climates would be much appreciated.

Mold Resistant Cannabis Genetics | Dragons Flame Genetics

Proven, elite, medical cannabis genetics built in tropical hawaii for tough climates. For the strongest, terpene rich, hardiest, most vigorous plants, get dragons flame genetics in your garden.

www.thedragonlifestyle.com

 

[bushbob]

Mold Resistant Cannabis Genetics | Dragons Flame Genetics

Proven, elite, medical cannabis genetics built in tropical hawaii for tough climates. For the strongest, terpene rich, hardiest, most vigorous plants, get dragons flame genetics in your garden.

www.thedragonlifestyle.com

Some interesting strains there. Any reported success getting into aus?

 

[Pikey]

Mold Resistant Cannabis Genetics | Dragons Flame Genetics

Proven, elite, medical cannabis genetics built in tropical hawaii for tough climates. For the strongest, terpene rich, hardiest, most vigorous plants, get dragons flame genetics in your garden.

www.thedragonlifestyle.com

Didn't Gazza grow some stuff from Dragon's Flame a while back?

 

[bushbob]

Have been reading up on mold resistant strains for the last couple of hours and just went on a tangent reading about silica for cannabis and it helping to prevent mold, mildew and other pests.
Should I be adding silica to the mix or do standard A+B nutes(could be in the cal-mag too I suppose) supply enough?

 

[junglelover]

There's an interesting article here on how commercial growers in Hawaii handle humidity and the extra pathogens. It's a shame sativa landrace strains have such a long photoperiod. They use clones to get them from cutting to flower within four weeks.
https://hightimes.com/news/big-island-grown/

 

[bushbob]

There's an interesting article here on how commercial growers in Hawaii handle humidity and the extra pathogens. It's a shame sativa landrace strains have such a long photoperiod. They use clones to get them from cutting to flower within four weeks.
https://hightimes.com/news/big-island-grown/

Good read. Thanks. Wish I had a mountain with a hydro-electric setup to grow on. Would be able to turn into a full on weed growing mountain hermit rather than this pain in the ass bush/swamp hermit setup that keeps turning my weed mouldy.

Already running on rainwater which is close enough to RO water, so I don't think there is much to improve there.

Some of these mould resistant strains sound really good. Usually prefer indica-dominant strains due to bad experiences with sativas getting too tall and having to scrap a couple of grows because they just kept growing to the ceiling. That was the early days of my growing and I wasn't using SCROG at the time, so maybe its time to give the sativas another go. I know some of my fellow local growers that have been doing it for 30+ years are die-hard Jack Herer fans, just not sure that their yields are breaking any records. Might be a matter of sticking more plants in and vegging them less to produce a sea of head with decent yields?

 

[bushbob]

Just gonna share this article on grow room ventilation. Good info on how to calculate CFM required, factoring in equipment, environment and ducting.