Ventilation for greenhouse roof
Solar Innovations Ridge Vent Demonstration or see more
Please watch the operable ridge vent video above …in action…
Natural ventilation for a Greenhouse or any Solar Structure has always been the ventilation method of choice as opposed to forced air by way of mechanical fans, air intake louvers, circulating fans, all of which work to some degree and continues to be used to this day but hardly cost effective. In today’s world, the cost of energy has restricted this application since continuing rising energy costs are now becoming not so cost effective anymore.
In the early days of sun room and greenhouse construction, the roofs were designed with glass or polycarbonate panels and in many cases the use of flexible 6mill poly was employed extensively. The only choice of ventilation was to employ the use of fans and air intake louvers. Since the advent of newer technology and creative innovations operable ridge vents are now becoming the standard as opposed to the option. The cost factor alone now makes, a whole lot more sense.
Greenhouse Ventilation Features
Natural ventilation works very efficiently , It basically works whenever air passes along the roof of the building, basically creating a vacuum effect thus sucking the heated air right out of the structure and more so, if the structure is built with operable side windows and or door vents to allow the heavier cooler air in.
This is truly the best method to maintain a steady temperature within your greenhouse or solar room structure. In recent times, I have visited many home installations with glass roofs that were literally too unbearable to stay in. The difference in temperature was in some cases 20 to 30 degrees hotter than the ambient air temperature just outside the door only a few feet away.
One may think logically that if your greenhouse has operable windows and a large door that you’ll relieve your greenhouse temperature by much. Regardless of how many opening vent windows you may have the temperature will remain hot for as long as you have an unventilated roof and any type of louvered fan will remain running 24 / 7 and will eventually burn out the fan motor.
Building any kind of solar structure room addition should always have an operable ridge vent that allows for natural ventilation. In the long run, the joy of relaxing and working within your new solar room in a comfortable ambient environment will, by far, outweigh the nuisance and regret of having a room that can’t be used simply because it’s too darn hot.
This archaic glass roof application without the use of an operable ridge vent for ventilation, in my opinion, is a waste of money and anyone considering building a greenhouse or solar sunroom addition should take ventilation seriously and should employ a proactive solution. When you think about it, its really not that much extra.
The picture shown here to the left is a custom skylight 24 x 12 with a 3-bay thermostatically controlled, lift actuator, ridge vent with screens on both sides….. manufactured by Solar Innovations..
GDS The Greenhouse Guy Oct 21, 2017