Internationally, grease ducts must be protected against weathering to prevent corrosion, and must be composed of specific materials based on the hood type. For example, commercial kitchen hoods should be of steel no thinner than .0575 inches. Duct tape can't fix stupid but it can muffle the sound shirt Duct joints must be welded flange joints, butt joints, or overlapping joints. A proprietary duct system that has its own inherent fire-resistance rating can be used, such as a metallic duct, either field fabricated or UL certified factory-built designs. Field fabricated is typically made from 16 gauge carbon steel, all welded per local codes, which is then externally treated with fireproofing. From story above. If this shirt is relating to your life, please feel happy to order this shirt : Duct tape can't fix stupid but it can muffle the sound shirt Factory-built designs are UL tested to UL 1978 and UL 2221 (for fire rated models) test standards, are made from lighter gauge stainless steel, and offered in single wall and multiple double wall insulated designs. Typical materials used for fireproofing field fabricated designs are:
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