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Ok here we go?


New Member
I am going to setup 2 2x4 grow closets. One for moms and the other for clones. I will be using ebb flow tables in each. Moms will be under Fluorescents and clones will be under HID.

My question #1 is will a 250w MH (Veg)switchable to 250w HPS (flower) be large enough for a 2x4x6 grow closet lined in Mylar on all four sides? The light has a 4" duct for venting. I can afford a 400w switchable unit but I wanna keep this small in size and electric cost.

Thanks for your input.:27:


New Member
Yes I will keep records and post on this site only. I liked your last grow bet you make friends easy down under with buds like that.:19:


New Member
Ok I picked up some of the stuff I need to build my rooms. I picked up a 2X4 ebb flow unit for the clone room. I also picked up a T5 4 tube for veg and mothers. I got a couple of bubble buckets and seed starters. In a couple of weeks I will go ahead and pick up a 400w 6" air cooled switchable HID, nuetes and clonex. Should start framing the room out before the end of the year.

:3: This room will be in the garage for privacy issues. I will be extending the house's HVAC duct to reach the main room and venting it into the closets from there. We have hot summers here so I decided not to get fresh air from the crawl space and I was also worried about possible molds and humidity.
:3:The HID will vent from the main room pass the light and go into the attic ending up at the roof vents.

#1 My question this time is with good venting and controlled temps in the 70s to 80s will I need Co2 in the flower room?
#2 What size and type of filter should I use to remove odors from a flower room 3x4x7 closet?

Thanks for your ideas in advance.


Well-Known Member
If you can afford it, and have a good excuse to keep going to get more co2, I would definitely get the co2 up to 700ppm during flowering. But, if you run natural gas in the water heater, it creates co2, and so does the natural gas heater. It could be feasible to vent off the exit tubes and control the co2 that way. It will add heat though.

As for the filter, an 18" should be fine.

This is just from what i have read, so I will let the experts chime in and straighten me out :)

Smokin Moose

Fallen Cannabis Warrior
What is LPG or LP Gas?
LPG or LP Gas is the abbreviation of Liquefied Petroleum Gas. This group of products includes saturated Hydrocarbons - Propane (C3H8) and Butane (C4H10), which can be stored/transported separately or as a mixture. They exist as gases at normal room temperature and atmospheric pressure.
Why is it called Liquefied Petroleum Gas?
This is because these gases liquefy under moderate pressure. They liquefy at moderate pressures, readily vaporizing upon release of pressure. It is this property that permits transportation of and storage of LP Gas in concentrated liquid form.
Where does LPG come from?
LPG comes from two sources. It can be obtained from the refining of crude oil. When produced this way it is generally in pressurized form. LPG is also extracted from natural gas or crude oil streams coming from underground reservoirs. 60% of LPG in the world today is produced this way whereas 40% of LPG is extracted from refining of crude oil.
What is commercial Propane & Butane?
Ideally products referred to as "propane" and "butane" consist very largely of these saturated hydrocarbons; but during the process of extraction/production certain allowable unsaturated hydrocarbons like ethylene, propylene, butylenes etc. may be included in the mixture along with pure propane and butane. The presence of these in moderate amounts would not affect LPG in terms of combustion but may affect other properties slightly (such as corrosiveness or gum formation).
How is LPG seen & felt?

* It is colorless and cannot be seen
* It is odorless. Hence LPG is odorized by adding an odorant prior to supply to the user, to aid the detection of any leaks.
* It is slightly heavier than air and hence if there is a leak it flows to lower lying areas.
* In liquid form, its density is half that of water and hence it floats initially before it is vaporized.
* It is non-toxic but can cause asphyxiation in very high concentrations in air.

LPG expands upon release and 1 liter of liquid will form approximately 250 liters of vapor
What is LPG used for?
LPG is used as a fuel for domestic (cooking), industrial, horticultural, agricultural, heating and drying processes. LPG can be used as an automotive fuel or as a propellant for aerosols, in addition to other specialist applications. LPG can also be used to provide lighting through the use of pressure lanterns.
Why are Butane and Propane used in combination?
While butane and propane are different chemical compounds, their properties are similar enough to be useful in mixtures. Butane and Propane are both saturated hydrocarbons. They do not react with other. Butane is less volatile and boils at 0.6 deg C. Propane is more volatile and boils at - 42 deg C. Both products are liquids at atmospheric pressure when cooled to temperatures lower than their boiling points. Vaporization is rapid at temperatures above the boiling points. The calorific (heat) values of both are almost equal. Both are thus mixed together to attain the vapor pressure that is required by the end user and depending on the ambient conditions. If the ambient temperature is very low propane is preferred to achieve higher vapor pressure at the given temperature.
What are the advantages of LPG?
The advantages of LPG are as follows

* Because of its relatively fewer components, it is easy to achieve the correct fuel to air mix ratio that allows the complete combustion of the product. This gives LPG its clean burning characteristics.
* Both Propane and Butane are easily liquefied and stored in pressure containers. These properties make the fuel highly portable, and hence, can be easily transported in cylinders or tanks to end-users.
* LPG is a good substitute for petrol in spark ignition engines. Its clean burning properties, in a properly tuned engine, give reduced exhaust emissions, extended lubricant and spark plug life.
* As a replacement for aerosol propellants and refrigerants, LPG provides alternatives to fluorocarbons, which are known to cause deterioration of the earth's ozone layer.

The clean burning properties and portability of LPG provide a substitute for traditional fuels such as wood, coal, and other organic matter. This provides a solution to de-forestation and the reduction of particulate matter in the atmosphere (haze), caused by burning the traditional fuels.

Smokin Moose

Fallen Cannabis Warrior
Propane combustion is much cleaner than gasoline, though not as clean as natural gas. The presence of C-C bonds, plus the multiple bonds of propylene and butylene, create organic exhausts besides carbon dioxide and water vapor during typical combustion. These bonds also cause propane to burn with a visible flame.


Well-Known Member
Boom, there it is, Thanks Moose :)

I have often thought about venting some of the exshaust from my water heater into a hose with a valve so I could bring the CO2 levels up (It's very close to my room)

But for me, the benifits are outweighed by the possiblility of killing th family by my not so handy work.

But I know it can be done safely.
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