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Several codes apply to this situation, NFPA 72, ADA, Life Safety 101, and perhaps a state/local standard.
Per NFPA 72: 2.8.1 The operable part of each manual fire alarm box shall be not less than 3 1/2 ft (1.1 m) and not more than 4 1/2 ft (1.37 m) above floor level.
Any type of vandal/tamper/weather cover must be UL listed for that purpose. Homemade solutions aren't UL listed unless the installed has gone to the trouble of having a UL field evaluation performed.
Any cover designed to be broken must meet ADA standards with respect to the amount of force required for that breakage, just as the manual fire alarm box cannot require more than a certain amount of energy, measured in foot/pounds to operate it, and cannot require gripping or twisting motions of the hand. The hinged covers with sounders may not require more than 5 foot pounds to operate under ADA.
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There ain't nothin' more powerful than the odor of mendacity -Big Daddy
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