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Use low-leakage volume control dampers from Grainger in systems that require airflow modulation. Blade designs maximize free area and increase performance. Square damper frames conceal external linkage. Choose from five different sizes in four frame types. Square 3V blade damper offers fabricated galvanized steel opposed blades with TPE seals, pressure rating of 2.5 to 6.0? wg and velocity rating of 2000 to 3000 fpm. The square airfoil blade frame features galvanized steel opposed blades with vinyl seals, pressure rating of 3.0 to 8.0? wg and velocity rating of 2500 to 4000 fpm. Square extruded blade dampers offer extruded aluminum opposed blades with silicone seals, pressure rating of 2.0 to 6.0? wg and velocity rating of 3000 to 6000 fpm. Round single blade dampers feature a single, galvanized steel blade with silicone seals, pressure rating of 4.0? wg and velocity rating of 3000 fpm. Choose the volume control damper that fits your needs. Shop Grainger today!