blue light shines the ceiling that equipped with air conditioning system devices and many bulbs large |
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| navigate by keyword : internet conference bandwidth security hub firewall wireless installation cool construction conditioning ventilation pipe industrial ceiling technology duct conditioner air stage concert show party club light entertainment night performance audience art event festival live band music disco crowd spotlight background equipment interior nightlife young person group fan sound hands smoke |
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| Blue light shines to the ceiling that is equipped with an air conditioning system, Wi-Fi devices, and many light bulbs. Large meeting room for holding trade shows or concerts |
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