The inner support and outer wall reinforcement of air duct reinforcement shall be connected by galvanized bolts, and the bolt passing through the pipe wall shall be sealed.

風管成型后，管端為陰、陽榫的管段應水平放置，管端為法蘭的管段可以立放。風管應待膠液干燥固化后方可挪動、疊放或安裝。風管應存放在防潮、防雨和防風沙的場地。

After the air duct is formed, the pipe section with female and male tenons at the pipe end shall be placed horizontally, and the pipe section with flange at the pipe end can be placed vertically. The air duct shall not be moved, stacked or installed until the glue solution is dry and solidified. The air duct shall be stored in a damp proof, rain proof and sand proof site.

風管漏風量應符合本規(guī)程定，采用法蘭連接時，其漏風量應滿足B級或以上要求；采用非法蘭連接時，其漏風量應滿足C級或以上要求。

The air leakage rate of air duct shall comply with the regulations. When flange connection is adopted, the air leakage rate shall meet the requirements of Class B or above; When non flange connection is adopted, the air leakage rate shall meet the requirements of Class C or above.

風管吸聲降噪性能的測試應符合現(xiàn)行標準《聲?混響室吸聲測量》GB／T?20247測試方法的規(guī)定，吸聲系數(shù)(降噪系數(shù))應大于或等于0．6。

The test of sound absorption and noise reduction performance of air duct shall comply with the current national standard Measurement of Sound Absorption in Sound Reverberation Room GB/T? According to the 20247 test method, the sound absorption coefficient (noise reduction coefficient) shall be greater than or equal to 0.6.

°直角彎管的制作可采用直管側(cè)面開口、端面封堵的方式或采用45°角裁切風管拼接的方式制作。導流片的制作參照規(guī)程第的規(guī)定，或采用與本體材料相同的專用件制作，采用專用件制作導流葉片的片距控制在75mm～80mm，合管時一定要保證導流片垂直于板面。

The angle elbow can be made by means of side opening and end sealing of straight pipe or splicing of 45 ° angle cut air duct. The guide vane shall be made in accordance with the provisions of the regulations, or the special parts with the same material as the body shall be used. The distance between the guide vanes made of the special parts shall be controlled within 75mm~80mm. The guide vane must be perpendicular to the plate surface when closing the pipe.

三通與90°直角彎頭的制作方法基本相同。

The fabrication method of tee and 90 ° right angle elbow is basically the same.

變徑管與直管的制作基本相同，端面邊長差值超過80mm的應采用拼接法制作，管長不宜小于600mm。

The fabrication of reducing pipe is basically the same as that of straight pipe. If the difference of end face side length exceeds 80mm, the splicing method shall be used for fabrication, and the pipe length shall not be less than 600mm.

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