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Even the same products can make different noises depending on resistance of flexible (duct), length, and capacity.
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We do not recommend direct connection. There could be safety issues or malfunctioning when not connected properly.
Under unavoidable circumstances, please use proper connector for direct connection current and check for waterproof and insulation issues.
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We recommend you to install wall type on a wall for safety reasons.
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The products are sold as a set, and it is not possible to purchase only the lid.
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If it is with same standards, it is easy to replace, but if it is different, you may need separate installation work to be done.
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You need to charge it before you use it for the first time. Please charge it for 3 to 5 minutes before use.
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For the products with backdraft damper, it is possible for the damper to be opened and closed due to draught and make noises. There is nothing wrong with the product.
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If it is installed in a place where draught is coming in, condensation may occur due to temperature difference, which causes water drops to be created.
Please make sure external air is not directly in contact through maintenance.
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Yes, it is ok.