Mid Range Blast Series (MRB)
Overly’s MRB series product are 2-3/4” thick doors. These doors are equipped with Overly designed and tested hinges and latching/locking devices. These Overly designed hinges are specifically engineered to accommodate the weights of the doors for many years of trouble free service.
There are five levels of performance consisting of models MRB-0, MRB-1, MRB-2, MRB-3 and MRB-4.
The MRB-0 can be used when an ASTM F2927 Damage Category III/U is specified or the door is permitted to rebound open during a blast event (0% rebound). The MRB-0 uses an ANSI grade 1 mortise lockset or exit device.
The MRB-1, MRB-2, MRB-3 and MRB-4 latching/locking devices is a proprietary design that incorporates one, two, three or four latching pins depending on the design pressures of the opening, The latching points can either be retracted by lever handle or panic device. All typical builders hardware locking functions are fully supported by this design. Panic hardware has been tested and passed all of the stringent requirements of UL Standard for Safety UL305 to ensure it’s integrity and operating functionality.
MRB products are available in single and double leaf swings. Horizontal sliding doors of similar construction and load ratings are also available.
These units are available fabricated from carbon steel for interior use, galvannealed steel for exterior use and depending on the projects blast requirements, 316 and 316L stainless steel. Other features that may be incorporated into these openings include such items as door position indicators, lock/unlock sensors, insulation and weatherstripping.
For those openings requiring automatic power assist opening operation, Overly can incorporate devices to accommodate this need.
If fire ratings are required, flush/non-electrified MRB units can be UL Labeled up to 3-hours in accordance with UL Standard for Safety UL10C, “Positive Pressure Fire Tests of Door Assemblies,” when the project parameters meet the requirements of the UL procedures. Consult factory with your specific project requirement needs for availability.
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