The greenhouse roof vent lids are operable using counterweights.
The counterweights are concrete blocks/large rocks/gravel held within diamond mesh baskets.
The counterweights are just enough to lift the lids using gravity.
The lids are pulled closed using ropes and tied off to custom fabricated cleats.
The ropes run through custom fabricated pulley blocks.
A special THANK YOU to the PLx4 family for helping with the install! From left to right: Pearson, Preston, Peter and Pauline.
