How To Build A Greenhouse | Greenhouse Plans » Ventilation

Greenhouse Vent Opener

admin — Sun, 07 Nov 2010 14:37:15 +0000

This is a computer controlled vent opener made with a windshield wiper motor. I use a laptop to monitor and record the weather conditions around the greenhouse and determine when to open/close the vents. blog: web4deb.blogspot.com

What is the most cost-effective way to build/run an indoor greenhouse?

admin — Sun, 23 May 2010 14:13:34 +0000

I live in a small apartment in San Francisco. There is one tiny East-facing window in my bedroom, and I can’t leave it open during the day because I live in the ghetto. All the other residents in the building are old, and like it warm and dry, so that’s what the room is like 24/7. But I’m used to having lots of nice green plants around, so I want to build an indoor greenhouse to grow plants. Note: I don’t want to grow pot, just interesting, colorful tropical plants, so suggestions for the bomb-ass high-yield hydroponic equipment doesn’t help me. What is the most cost-effective way to do this? I need to build a set-up in which I can maintain high humidity, good ventilation, and lights, without trashing the environment or my wallet (I’m willing to invest some money and a lot of time I’d also like to have a separate section for cacti. What can I say, I grew up with a big garden in San Diego in which you could grow anything, so I’m spoiled.

DIY Indoor Greenhouse (Grow Plants Indoors)

admin — Fri, 16 Apr 2010 03:45:27 +0000

I built two small indoor green houses and experiment with various plants to grow. I show all the parts and describe them so you can build your own. My first is a fish tank, and the second is a trash can. I give the specs on the temperature for the trash can as well.

Greenhouse Ventilation

admin — Tue, 06 Oct 2009 20:44:31 +0000

Excellent Ventilation is essential if your Greenhouse crops are to thrive. Ventilation controls the temperature and humidity of the air in the greenhouse, both of which are essential factors. Excessive humidity can lead to mildew and other fungi proliferating, and excessive heat can quickly dry out and kill your crops.

Greenhouse ventilators are generally positioned in the roof and sometimes in the sides of the greenhouse. In the ideal world around 20% of the total floor area should be dedicated to ventilation, so in an 8 x 6 foot small domestic greenhouse, there should really be around 9 square foot of ventilation. Unfortunately it is rare that a greenhouse supplied as standard will provide any where near that much ventilation.

Through the seasons the ventilators should be used differently. During the spring just the greenhouse roof ventilators should be used. This is will lead to a slow flow of air as the hottest air escapes through the roof. As temperatures hot up during late spring and summer side ventilators (or the door) should be opened. This will result in a large increase in air flow as cool air enters the greenhouse from the side and hot air escapes through the roof. Even during the cold of winter and early spring ventilation is vital during those still, cold, and damp days when the air is stagnant and not moving. A little roof ventilation, ideally with some heat, is important.

Remember that it is always better to over-ventilate than to under-ventilate so consider fitting a suitable louvre window in the side of your greenhouse to increase cooling draughts during the summer, and an automatic greenhouse roof vent which will open whenever the temperature is above your chosen set value (pictured above).

If you intend to grow a self-sufficient crop of fruits and vegetables in your greenhouse, then it is even more important to ensure that ventilation is taken care off. Therefore it is well worth investing in an extractor fan (fitted into one of the panes of glass in the roof) which will completely replace the air in the greenhouse every few minutes on the hottest days. Using a thermostatic controller enables the extractor fan to be run automatically, and it can also be powered with environmentally friendly solar panels.