GB 50243-2016 第6.2.8条
| **** | Duct access doors (inspection doors) shall open and close smoothly and tightly; when used on ducts within hotel ceilings, they shall allow easy maintenance without affecting ceiling aesthetics. |
| **** | Duct access doors (inspection doors) shall open and close smoothly and tightly; when used on ducts within hotel ceilings, they shall allow easy maintenance without affecting ceiling aesthetics. |
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