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round collar only) * 830 OR - factory installed opposed radial damper (sizes 6"-14") * 830 FR - U
blades prevent metal on metal rattle Countersunk mounting holes with color matching Phillips Pozidriv screws Rust-resistant pre-coat with durable powder finish Soft White Options Screwdriver operated Opposed Blade Damper 2" ADC compliant square to round collar with a bead for ease of installation Heavy Duty Construction MRI Compatible Insect Screen Fractional
Mounting Holes - Designed for ceiling or sidewall application
parallel to longest dimension
Options * Sleeve variations * Mounting flange * Adjustable counter balance to adjust various opening pressures
Parallel Volume Damper Low Leak 3000PLL-70X60 Smoke-Fire Damper round collar only) * 830h3. Standard Features * 16 gauge galvanized channel frame * Parallel blades are cee stiffened 16 gauge galvanized for strength and stability * Blades pivot on non metallic celcon bushings * 1 2" square zinc plated steel pivot pins * 1 2" square zinc plated steel adjustable operating shaft extending up to 4" beyond the air control frame * Single blades on dampers with a height of 12" or less * Mill finish h3. Options * 3000 PLL Low Leak Air Control
