Alright - I constructed a new bloom cabinet last night and in the process I had to create a carbon filter. Here are the materials your going to need:

A good plan
Box Cutter
Reflective Duct Tape
Wire Caps (You can use electrical tape, but caps are safer)
Scissors
Wire Ties (I use my plant ties, but you can use bread bag ties if needed)
Extra Extension Cord
Electric Tape
4"-12" Inline Exhaust fan (You should already have this, if not, you can get one at lowes for $28 for a 6" or 8" fan)
Activated Carbon Filter for homes (You can find these at any hardware store, or walmart, typically for $10 or less)

Your good plan - Carbon Filters can be made in several difference sizes, keep your cabinet size, and filter placement in mind when your constructing your filter. You can place a filter directly in the wall, or you can hang it up top, set it in the corner, or vent straight out of your grow box into a recycling filter to save grow room - Most of us using cabinets are using them for their discretion, so having the filter outside of the box is kinda moot.

In this case I have a 3'x18"x3' grow space and I'm using a 8" filter and fan, however, I'm pulling my air from a 4" pre-filtered intake coming from another, smaller cabinet (that requires less ventilation/filtering) I also have 6" oscillating fans in both cabinets to help push/pull/cool/structure plants. (Yes, fans play an important roll in bud production) The carbon filter I'm building will be 8" wide, and about 5" deep, double lined - Since the goal of this is both cooling and filtering smell, placement is going to be a little above the 24" mark in my cabinet, which will ensure semi even temps throughout the cab, as always, it will be warmer towards the top - So my intake will be towards the top, pulling the fresh air down towards the plants, and cooler air from the smaller cabinet over the lights (The intake is coming from the bottom chamber of my other cabinet, where temps are a steady 75 degrees before the vent, so an estimated 70 degrees after the vent (no need for adjusting, this bottom chamber is my mother chamber, growth is not as important as sustaining the plant).

Lets get to filter creation:

First, gather your supplies:
Attachment 288048
I got this filter on sale for $7

Next - Prepare your filter cap - This is the plastic cutout from your cabinet (or wood)
Attachment 288049

Next - Trim your plastic mesh to size:
Attachment 288050

Cover your cap in reflective tape:
Attachment 288051

Wrap plastic mesh around cap and attach with twist ties
Attachment 288052

(More in next post)
low_rdr Reviewed by low_rdr on . DIY $10 Easy to make yourself Active Carbon Filter Alright - I constructed a new bloom cabinet last night and in the process I had to create a carbon filter. Here are the materials your going to need: A good plan Box Cutter Reflective Duct Tape Wire Caps (You can use electrical tape, but caps are safer) Scissors Wire Ties (I use my plant ties, but you can use bread bag ties if needed) Extra Extension Cord Electric Tape Rating: 5