Grille with adjustable blades on the spiral duct STS-WDescription and application Ventilation grille for intake and exhaust to spiral ducts. The front frame is shaped according to the channel diameter. Application in low- and medium pressure installations. Recommended is installation in ducts and ventilation openings holes using visible bolts in holes the front frame. The front frame is made of steel profiles. Blades are mounted horizontally (STS-W). Adjusting the angle inclination of blade is manual and individual for each blade. Material:
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