Roof negative pressure ventilation window

Date of issue：2020-12-18 07:23:13Number of visits：

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Characteristic:

A. Two sides and four sides

B. Automatic opening size of negative pressure

C. high temperature, cold, foam plate thickness 20mm.

D. High strength

F. Easy to install

G. Long service life

H. outer frame, leaf ABS engineering plastics, bottom foam board.

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