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Which entry doors are considered intruder security doors?
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What is an STC rating?
Resolution:
STC stands for Sound Transmission Class. An STC (Sound Transmission Class) is a single number rating system derived from measured values of sound transmission loss in accordance with ASTM E90...:
Which closer is the heaviest duty?
Resolution:
The 4010, 4020, 4110, and 4040/4040XP are heavy duty closers.: