1.According to the workplace and the installation position of indoor environment choose extraction hood, fixed at the top of a smallpox hole punch, use M8 expansion screws to fixed frame on the top
2. Inserted the expansion pipe fixed frame exhaust duct hole, use pipe hoop lock expansion pipe and the exhaust duct to screw decorative plate positioning
3. Tighten the gas-collecting hood
4.Connect exhaust outlet and exhaust system
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