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BigAir Louvered Container Vents (sizes: 30, 45 & 60), come with a marking guide to make cutting a hole as easy as possible! Rivets and self-tapping screws are also included (we recommend using rivets). A minimum of two vents are required per container for temperature & moisture control in temperate climates. Four vents per container are suggested in tropical climates. For HAZMAT ventilation, two vents installed high and two vents installed low is suggested. Customer's responsibility to ensure OSHA compliance when storing hazardous materials. Eliminate moisture and excess heat with our state-of-the-art computer-modeled design. Made with highly durable Polypropylene and Aluminum, the BigAir will never rust! The variables inside a shipping container are always changing. When the combination of those variables creates an environment prone to humidity, condensation will happen.