As a matter of fact in some climates building sealed grow rooms may be the only real practical option if you want to grow indoors year round using lights.
Sealed grow room.
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Sealed growrooms are those that have no exchanges between the interior and exterior of the cultivation space.
The concept of a sealed room is quite basic.
No air is extracted out to or drawn in from outside the sealed grow space.
It doesn t need to be airtight however the closer to airtight the better.
Closed loop systems involve having a completely sealed grow room.
A sealed room is a growing environment where there are no holes or air exchanges to the outdoors or any other room.
So in building sealed grow rooms you are looking at three to four times the initial investment on smaller scales.
Instead the temperature is kept within the right range by a heater and an air conditioning unit.
Humidity is controlled by the use of dehumidifiers and humidifiers.
On larger scales the difference narrows as you move up in size.
By creating such an independent ambient atmosphere indoor growers have control over temperature humidity and co2 without having to consider in much detail outdoor environmental constraints.
Air vented or totally sealed.
Ideally they are sealed tight from any air or light leaks.
Regulating co2 in the grow room.
Growers have found great success in heightened efficiency using this concept for years and it s something every new gardener really should consider.
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While adding small amounts of co2 does not require a sealed grow area higher concentrations in the 1200 1500 ppm range would be easier to achieve with a sealed or closed loop room.
This really is the best way to protect your garden from negative outside influences.
Co2 is heavier than air so oscillating fans will assist in distributing the co2 evenly throughout the grow area.
Cannabis needs fresh air to grow well.