... Standard Sizes:20x20mesh, 20x18 mesh, 18x18 mesh, 18x16 mesh, 18x14 mesh, 16x16 mesh, 16x14 mesh, 14x14 mesh. many colors Fiberglass insect screen ... for the purpose of ventilation. Fiberglass insect screen offers excellent properties of fire resistance, corrosion resistance ... cleaning, good ventilation, high strength, stable structure, etc. Standard Sizes:20x20mesh, 20x18 mesh, 18x18 mesh, 18x16 mesh, ...