221 Series – Super Boost
Standard Pack: 10 per box
Standard Lengths: 12″ to 72″ lengths available.
Special Features: Class 5 balance system capable of counterbalancing weights up to 120lbs. Has tube diameter of .759″. Excellent operating forces. Design allows 1/2″ additional travel compared to other similar systems.
Other Information: AAMA 902 approved balance. Easy to adjust before or after installation. Cycle tested to over 55,000 cycles.
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