- Maintenance-free extruded aluminum
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- Triple track self-storing glass & screen inserts
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- Wool pile weather-stripping
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- High quality die-cast hardware
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- Adjustable sill expander for perfect fit
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- Removable inserts for ease of cleaning
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- Wedge locks to minimize rattle
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- Freedom from noise, drafts, insects
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- Insulation for both heating and air conditioning
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- Greatly reduced maintenance of prime windows
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- Ease of changeover from insulation to ventilation
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- Ease of installation; simple for “do-it-yourselfers”
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