Mesh size is counted as the number of openings per inch. A higher number means smaller holes, so the insect net blocks smaller pests but also restricts airflow.
Coarser grades suit larger pests such as moths and beetles and keep ventilation strong. Fine grades are used against whitefly, aphids and thrips, which are much smaller, and are common in greenhouse side vents and nursery tunnels.
Because fine mesh reduces air exchange, growers often increase the ventilated area or combine it with shade net to lower temperature inside the structure.
Tell us the pests you are fighting, your crop and whether the net is for open field or greenhouse vents, and we will suggest a mesh grade, width and fixing method.