Some questions about autos and some cheap fans and filters

jhnfrmrby420

Active Member
How high above tops of autos should I keep my 400Watt HPS?

What Temp And Humidity should I try to maintain?

This will be in a 3x3x7 grow box 400watt HPS, 250 CFM Inline Duct Fan, Charcoal Scrubber/filter, small window fan to circulate air, FF soil, FF Nutes, goin for a 6 plant grow in 3 gal smart pots, also picking up some oxygen tabs, pump and airstone to oxygen saturate my water.

When the lights go off should I have everything go off with timer or keep the window fan blowing on them on? My house is always a little chilly, so dont want them getting too cold at night.

For fresh air IN, what should I do? Just cut a hole with maybe a filter over it? How would I keep light out during dark period through the intake hole If Its nec to put one?

And how do you calibrate this PH pen Pictured below? Its a no name but says my tap well water is like 14.5....lol So If I dont know the PH of the water to begin with how do I calibrate it?????

Below is my inline 6'' duct fan, Im gonna go into a reducer reducing it to 4 inch hooked up to the 4 inch dryer hose and to my $48 shipped from amazon 200 cfm filter/scrubber Also Pictured is my PH pen and the filter, someone please help with this damn pen!

FILTER/SCRUBBER
Amazon.com: LED wholesalers 4" Hydroponic Carbon Air Filter 200 CFM Air Scrubber Oder Control, GYO2305: Home & Garden

I saw many filters online and didnt think I would be getting one because of the price of these things, but you cant go wrong at this price. now we'll see how it works

And the fan was $26 at Lowes this is 250 cfm, my filter is only 200 CFM, but its only for a 3x3x7ft high plywood grow box, that should be ok, right???? That the fan is 250CFM and the filter is only 200CFM?
 

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P.S. what should i DO FOR AIR INTAKE INTO THE BOX? JUST CUT A HOLE SOMEWHERE, i WOULD THINK THE 250CFM FAN PULLING AIR OUT WOULD ALSO DRAW AIR IN IF i MADE A HOLE SOMEWHERE, RIGHT? i'M ALSO USING A SMALL WINDOW FAN INSIDE TO BLOW ON PLANTS
 
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