411028-S&P 28″ X 28″ series 411 automatic exhaust damper. Max velocity of 2000 FPM.

611035-S&P 35" X 35" series 611 automatic exhaust damper. Max velocity of 2250 FPM.411022-S&P 22" X 22" series 411 automatic exhaust damper. Max velocity of 2000 FPM.

411028-S&P 28″ X 28″ series 411 automatic exhaust damper. Max velocity of 2000 FPM.

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S&P 28″ X 28″ series 411 automatic exhaust damper. Max velocity of 2000 FPM.

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