FAQ's - Air
Q. What is the most effective way to eliminate my grow room
A. Charcoal filters are very efficient in removing unwanted
odors. They remove 99% of all grow room odor when used with an inline fan. Nothing on
the market can compete with a high-quality charcoal filter for grow room odor
Q. Do ozone generators work for odor removal?
A. Yes. Not nearly as effective as a charcoal filter but
they do work to some degree. They do kill bacteria and fungi very well.
Q. Is ozone harmful to humans?
A. High levels of ozone can burn your skin and really hurt
your eyes. Do not stare directly at the lamp in an ozone generator. If you can
smell a strong ozone presence in your room that means you are using too much.
Ozone will oxidize the cells in your lungs and can be hazardous to your health.
Q. How exactly does ozone work?
A. Ozone is 03. Oxygen is 02. Ozone is oxygen with a third
atom stuck to it. It does not like having a third atom stuck to it and it will
do anything to get rid of it. After about 1/2 an hour the third atom falls off
looking to grab a partner. In this case fungi and bacteria are usually that
partner. Once the 03 has shaken its third atom it becomes stable again and can
move on. Ozone works best when it has a chance to mix or swirl with its
Q. How does an ozone generator actually make ozone?
A. Ozone lamps (germicidal) produce high energy photons that
hit oxygen gas and expand the electrons and a third oxygen comes together to
form O3 (ozone). Germicidal lamps are powered by special ballast and come in a
variety of different sizes to fit specific grow room requirements.
Q. How long does the average charcoal filter last?
A. That depends on the manufacturer. High quality filters
such as Can filters or PHAT filters will last from 2- 3 years of continuous
use. They can be repacked but it's really not worth it by the time you buy the
carbon and get it in, the odds of it working as well as when you got it are slim. These filters are professionally manufactured for long lasting
unsurpassed duality while the average Joe at home can't possibly pack the carbon
Q. Is it good to use oscillating fans?
A. Yes, lots of air movement is essential for a productive
indoor garden. Oscillating fans push the air through the leaves and the tops of
the plants which is where good air flow is a must. Leaves take in the air on
there underside through tiny microscopic pores known as the stomata.
Oscillating fans also help with pollination. If you're not getting tomatoes on your plants try using a fan.
Q. When should I use CO2 in my grow room, day or night
A. CO2 is only need when the lights are on. During the
plants dark cycle the plants actually respire CO2 and breathe in oxygen, just as
Q. What are the best ways to produce CO2 for my indoor
A. There are 2 very good options. The first being propane or
natural gas CO2 burners. The second being CO2 tanks used with a regulator and solenoid
hooked up to a timer. The propane and gas burners produce high amounts of heat,
but are definitely more efficient cost wise to operate compared to the
cylinders. Propane is easily available at local gas stations while cylinder
usually has to purchase at a welding ship. Some hydro stores carry them for
lease. If the room is large then the propane or gas burner is much more
efficient. If heat is a serious problem then the cylinders definitely have an
advantage in that they produce no heat but can get costly to operate on a large
scale. The burners have been known to cause high humidity in the room so
growers will have to really keep an eye on humidity when using a burner.
Q. Is CO2 really that important to my garden?
A. Yes. Growers on average report 20-30% increase in
their yields when using CO2 properly. CO2 is what your plant breathes and
requires for photosynthesis.
Q. How much CO2 do my plants need?
A. Having carbon dioxide levels at 750-1,500 ppm can increase your yields by 30-50%. Anything above 1,500 ppm is considered wasteful and above 5,000 ppm is harmful. Levels below 200 ppm will greatly limit your plant, while levels below 100 ppm will make your plant stop growing.
Q. What should my grow room temperature be at?
A. Optimal grow room temperature would be 75 - 85 F. After
that photosynthesis starts to slow down because the stomata (leaves microscopic
pores which breathe in air) close down to conserve water transpiration.
Q. What should the root zone temperature be at for optimal
A. The ultimate temperature your roots will be most
productive is 75 F (23.9 c)
Q. What is the purpose of adding CO2 to my grow room?
A. CO2 plays a major role in photosynthesis. The leaves
produce sugars by using light to combine water and nutrients with CO2. When you
increase the rate of photosynthesis with CO2 you increase the growth rate and
the potential yield for your plant will increase.
Q. What is more efficient to operate, an inline fan or a
squirrel cage fan?
A. Based on CFM per amperage inline fans are usually most
efficient. They have been designed with maximum air flow at a minimum wattage
leaving the grower with a very efficient product. Squirrel cages are becoming a
thing of the past now with the evolution of inline fans taking over the market.
That delivers so much more CFM per watt than the typical blower that only makes
sense to invest in an inline fan.
Q. What is a quieter fan to operate? A squirrel cage fan or
an inline fan?
A. Inline fans are extremely quiet and usually much more
efficient than the squirrel cage fan. They typically have a higher CFM rating
per watt than a squirrel cage fan and usually come with a 5 year warranty so
it's hard to beat them!
Q. What should the humidity be at in my grow room?
A. Ideally the humidity should sit around 55-65%. Any higher
than 70% can pose a serious problem. High humidity in the dark cycle can lead
to gray mold and can ruin a crop. Humidity is very important and should be
maintained with a hygrometer. These are in expensive and really help. When the
humidity reaches a high level a dehumidifier is a must. These can be purchased
at Home depot or Wal-Mart and they work excellent. They can easily pull 5
gallons a day out of the air if your grow room is humid so keep an eye on your
Q. I have an 800 CFM fan exhausting out, what should I have
bringing fresh air in to supplement the air going out?
A. You should always bring in at least 1/2 the amount of CFM
into the grow area as you are exhausting out of the grow room. Constant fresh
air is a true asset to any indoor garden and is defiantly needed for optimal
Q. How much CFM should I have for every 1000 watt lamp had
in my garden?
A. A safe recommendation is 125 CFM per 1000 watt lamp in
the summer this should rise to 150 CFM per 1000 watt lamp. Excess heat can
really slow production down.
Q. Is it possible to use a standard window air conditioner
in my basement grow room?
A. Yes, this is very easily done. It is very simple and works
so well. First measure the dimensions of the rear of the unit. Call a heating
and ducting company and have then fabricate you a box. Most ducting companies
will do custom fabrication for very reasonable prices. Have them construct you
a box 2 feet deep with a 4 inch round duct at the end. Have the box built so it
fits perfectly over the rear of your window AC unit. The idea of the box is
trap the heat produced from the rear of the unit. Once you have a fabricated
steel box fasten it with self tapping screws to the AC unit. Attach a 4"
inline fan to the 4" duct on your box to suck the heat from the AC unit.
Vent the 4" duct out a dryer duct or through the furnace to remove the
heat the AC unit produces. It may seem like a lot but it is a simple procedure
and it will really reduce the heat in your grow room. I had a box made for $45
and it worked like a charm.
Q. What type of ducting is better to use, aluminum flexible
or the vinyl flexible?
A. Use the aluminum. It will retain the heat better than the
vinyl will and will also retain the heat better. Aluminum ducting is not much
more than the vinyl and is a much better purchase in the long run.
Q. What are the Stomata?
A. The Stomata is tiny microscopic pore on the leaves
undersides that control the flow of air into the plant. Basically the Nostril
of the plant. It is important to keep plants free of dust and dirt as it can
clog these tiny pores. High humidity also affects the stomata by reducing its
ability to respire. The surrounding air is so humid the plant
can not breathe out as the surrounding air is full of water already and cannot
accept the moisture the plant is trying to send off.
Q. What should the temperature in my cuttings area?
A. The room temperature should be between 72-75F for maximum
Q. What precautions should I take with a CO2 burner? I've
heard they can be dangerous?
A. C02 burners are safe when used correctly. The first
precaution is to purchase a carbon monoxide detector. Theses are very cheap
(around $ 40) and will let you know if your home reaches high levels of carbon
monoxide. Co2 burners should be purchased based on grow room size and therefore
should be safe to operate. Make sure your burner is mounted securely. Remember
this is a fire hazard due to the fact there are flames burning at all times.
Make sure nothing is in the way of the unit and that is secure and will not tip
over. Test for leaks using soapy water at all fittings at least once a month.
When used properly C02 burners are great. They do however require some care and
are not for the average Joe who is just playing around.
Q. CAN FILTERS-How much CFM loss is there through the
A. Every different size of filter provides a different
resistance to each different size and style of fan you put on it, a filter at
the maximum exhaust CFM rating has approximately 0.7 wg. pressure drop. All Fans
will have a lower CFM at a higher pressure. For Example at .5"wg the
10" Max-Fan goes from 1019 CFM to 885 CFM, The 12" Max-Fan would go
from 1708 CFM to 1595 CFM
Q. CAN-FILTERS - What is the Maximum Temperature/Humidity I
can run my filter at?
A. The maximum recommended temperature that you can run your
filter at is 80 Degrees Centigrade, and as soon as your start rising above 70%
humidity, the water molecules in the air start to get stuck in the carbon pore
structure and slowly diminish the life of the filter.
Q. CAN-FILTERS - How long does the filter last?
A. The life of a filter is determined by the concentration
of the contaminant, the relative humidity and the volume of air cleaned.
Unfortunately there is no indicator light on the filter that tells you when it
is ready to be replaced. Experience with one Can-Filter will give you an
expectation for future Can-Filters in your particular application.
Q. CAN-FILTERS- Is there a calculation for sizing a room?
A. Yes, there is and it’s really quite simple, all you need
to do is take your cubic feet of the room (Length x Width x Height) and divide
that number by the number of minutes you would like to exchange the air in the
room (Only 1 – 3 Minutes is recommended) and that will give you the recommended
minimum CFM that you need for that room, then you take that Min CFM number and
match it to one of our filters and as long as that Minimum recommended CFM is
higher then the exhaust minimum on the filter you will have adequate airflow
and proper filtration for that room.
Q. CAN-FILTERS- Can you push or pull through the filter?
A. You can both pull through the filter or push air through
the filter, if you are going to push air through the filter it is recommended
to take off the outer pre-filter and place it before the intake of the fan so
you can remove dust and dirt particulate before it enters your fan and filter.
Q. CAN-FILTERS- How do I size the proper fan to a filter?
A. We actually put the recommended fan right on the sticker
on the Can-Filter to take away any of the guess work you may have had to do in
the past, but if you do not have a filter right in front of you the same
formula for sizing a room works to size a fan to a filter and a filter to a
room ( Length x Width x Height) gives your cubic feet and then divide that
number by the number of minutes you would like the air to be exchanged in that
room (only 1 to 3 minutes is recommended!!) and that will give you the
recommended minimum CFM that you need for that room, then you take that Min CFM
number and match it to one of our filters and as long as that Minimum recommended
CFM is higher then the exhaust minimum on the filter you will have adequate
airflow and proper filtration for that room.