Our products are made out of high quality plastic and coated steel. Guaranteed long life and durability. good compatibility with other ECOPRO VENT products.Duct opening size: Ø 4'' inch Soffit grille color: Black / Insect mesh: Yes Quick and easy to assemble - DIY / No screws included. perfect for Heating, cooling or air conditioning - HVAC, bathroom and kitchen air exhaust. Heat-resistant from: 5 °F to 160 °F.