Upgrading to CMH query

coreywebster said:

No problem, if you want pointing toward a more quieter fan I can do but they cost more.
The RVK or similar is a work horse and will last forever.

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dougens said:

Thanks for your reply.
What's the height of your 2x4 tent?
Is 180cm (5.9ft) enough headroom for the plants with oxypots?

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dougens said:

Thanks for reply.

Can you confirm what extraction you use and if 4/5inch extractor is sufficient?

I'm guessing SoCal is in southern califormia?

I'm in the Uk where the winters and summesr are much colder, hence my concern with the cold.......

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Renfro said:

Generally we use the fan to pull hot air from the top of the tent, with a carbon filter installed on the intake to control odor, the ducting off the fan is then routed outdoors so the heat doesn't get back into the tent. The tent has intake vents in the bottom that air flows into so as to replace the air exhausted by the fan.

I don't have much confidence in the fan you linked, it's an axial flow fan so it's not capable of handling static pressure loss well (duct work, carbon filter, bends). I will tag @coreywebster as he knows more about the various products available where you are located. I recommend vortex VTX series centrifugal blowers here in north america.

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dougens said:

Hi

Beginner here.

I've been running the below kit in a spare room with mixed results:

• 75x75x100cm grow tent
• 2 xCFL 250W
• Desk fan blowing in the tent
• growing in soil - usually 2-3 autos

I have got hold of a 315 Ceramic MH on the cheap and thinking of getting the below as a new set up and starting DWC.
This will be set up in the South of the UK but now have to move the kit to an outside under stairs cupboard, the space is 115x90x200cm - pic here
The space is not in sunlight and in the shade all day.

View attachment 4618312 View attachment 4618314

• 80x80x180cm grow tent
• 315 CMH light
• 4 or 5 inch extraction fan with filter
• 1-2 oxypots (I'll start with 1 to get used to it)
• Nutrients (vege / bloom)
• PH up and down etc
• PH tester

Are there any glaring issues or advice with the new set up?

Will the cool outside air be too cold?
Is the space big enough for the light?
Am I better with a HPS 250W in this space?

I plan to mainly vege and flower at night in case the intake air is too cool with no lights on.
The seasons will effect the temperature so potentially get a small heater for when the lights are switched off?

Any advice, help much appreciated.

Thanks

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