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“ Which entry doors are considered intruder security doors? ”

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Resolution: MultiPoint locks are three-point locking systems that secure the door at three points – top, bottom, and traditional center latch location. Operating just like traditional locks, MultiPoint locks...:

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.: