[Athos]

Unless I open the grow box there's absolutely no smell.

At 12 volt there's a slight fan noise, but at 9 volt or less there's no noise.

I used crown drill bits to to make round holes in the Tupperware, them I inserted the filter and used the "screw cap?" to screw to secure ir to the tupperware.

[jonhova]

With the filter is it possible to change the carbon filter out after a grow or 2?


If i wanted to build it would it be like this:

1 cut hole for the fan in cab ceiling/side wall.

2 mount fan

3 seal fan with caulking/ weatherstripping? How did you light proof the fan?

4 drill tupperware, 4 holes on the lid, add nuts & bolts to secure the tupperware lid

5 cut out 3"? 4"? Diameter hole from the bottom of the tupperware.

is the 705 can cap removable? and can you screw it on from the inside of the Tupperware?



Really slick man

I'm gonna go with a noctua fan as well probably the 120 mm 2000 rpm server fan.

[Athos]

Originally Posted by jonhova

With the filter is it possible to change the carbon filter out after a grow or 2?

Are you asking if you can replace the used carbon? I don't know, I don't believe so. I've seen some people in this very forum saying that they've been using this very filter for 2 plus years, so no reason to change it after a grow or 2.

Originally Posted by jonhova

1 cut hole for the fan in cab ceiling/side wall.

I used a 60 mm crown drill bit to make a hole in the back of the grow box and on the top of the tupperware.

Originally Posted by jonhova

2 mount fan

The fan is mounted inside of the tupperware’s top and the top is screwed to the grow box.

Originally Posted by jonhova

3 seal fan with caulking/ weatherstripping? How did you light proof the fan?

I covered all of the tupperware in black electrical tape. Then I made a flap with piece of black garbage bag that I taped on the outside of the exhaust hole.

Originally Posted by jonhova

4 drill tupperware, 4 holes on the lid, add nuts & bolts to secure the tupperware lid

See #2

Originally Posted by jonhova

5 cut out 3"? 4"? Diameter hole from the bottom of the tupperware.

I carefully measured the hole I needed after I got the filter, in the case of the can 705 it’s a 70mm (2¾ inches). See the picture below

Originally Posted by jonhova

6 is the 705 can cap removable? and can you screw it on from the inside of the Tupperware?

Yes it’s removable and yes you can screw it back on the inside of the tupperware, that’s what I did. See next picture to see the cap off.

Originally Posted by jonhova

Really slick man

I'm gonna go with a noctua fan as well probably the 120 mm 2000 rpm server fan.

The can 705 is rated for a max flow of 22 m3/h (13 CFM); the NF-A6x25 FLX, that I used, is rated at 29.2 m3/h (17 CFM). I assumed a drop of air flow of 30% due the resistance of the filter which puts the fan at an assumed flow of 12 CFM, making the combo perfect. Exceeding the rated air flow will result in the air not having enough contact time with the carbon, making some smell leak.
This fan is also rated at 2.18 mm H2O which was enough. Also at a rated noise level of 19.3 dB the fan is whisper quite, but when attached to the filter, the noise increases a bit.
The 12mm Noctua fan you mention is rated for 121.8 m3/h (71.7 CFM), which is way more than the can 705 can handle, for this I would go for the can 1500, rated for 150 m3/h (89 CFM). The one thing I would like to mention is that the 12mm noctua you mention is quite loud, rated at a noise level of 29.7 dB.
What ambient temperatures are in the room that you plan to put your grow box? And how many watts of light are you planning to use? Maybe you don’t need that much CFM power?

[jonhova]

Wow amazing information!

I have a 2x2x5 That i will stick 10 x 12 watt led bulbs without the cover. I dont know if thats over kill or not just yet. Being silent is very inportant to my stealth.

I think the fan you recommend should be able to cool down my cabinet or at least i will try it out. If not i can return it for the stronger one.

This can and pc fan combo is a game changer and should be added to thr link o rama thread.

[Athos]

There's a formula somewhere in the forum, probably the design forum. Where you can calculate the needed CFM you would need, depending on your wattage and ambien temperature and target temperature; that's how I decided on my fan, it wasn't a guess.

CFM = 3.16 * Light wattage / (Target temperature in °F - Ambient temperature in °F)

[jonhova]

Do tou think that this fan will create negative pressure in a 5 foot box though?

[Athos]

Any fan will create negative pressure if the intake is passive.

[Athos]

Originally Posted by jonhova

... Being silent is very important to my stealth.

The Noctua 120 mm 2000 rpm that you mentioned is rated at a noise level of 29 dB which is definitely not silent.

For the 120 watts that you want to use, I would use:
1. NF-F12 PWM, 55 CFM and 22.4dB, just slightly noisier than what I use but with enough power to keep the temperatures with 120 watt of light.
2. As for filter the can-lite 1500 for a max airflow of 89 CFM

[jonhova]

Awesome. Thanks for your suggestions.

[Athos]

Not my usual update time, it's day 66 of flower stage.

Here'a a couple of pictures of how the plants look. What do you all think? I'm tempted to harvest since they look done to me, thricomes are like 80% cloudy, a 10% amber and a 10% clear, pistils are mostly yellow and retracted.