Ive got a 10 x 8 greenhouse with four windows in it. How many autovents do I need?
No matter the size of the greenhouse you have, the ideal is always to ventilate 20% of the floor area. Sometimes however, this is just not possible, so a vent opener on both sides of the greenhouse is a good idea. This creates a good air flow. Using a Triple Spring autovent on a side window that opens vertically creates an even better flow due to convection.
