1.2 Cabinet housings shall be fabricated from sheet aluminum grade 5052-H32. The Sheet aluminum shall be at least 0.188 inches thick for the body and bottom of the cabinet. The top and door shall be at least 0.125 inches thick and adequately reinforced. All construction shall be free of dents, scratches, weld burn through and abrasions harmful to the strength and general appearance. All seams shall be of continuously welded construction or alternative weatherproof construction consisting of noncontinuous welds provided the connections are mechanically sound and weather resistant because of material overlap, when approved by the procuring agency. 1.3 A certificate of compliance from the manufacturer shall be furnished certifying that the material used in the construction of the cabinet housing complies with the requirement of paragraph 1.2. 1.4 Aluminum surfaces shall conform to the following: A) An anti-graffiti coating shall be applied to the aluminum surface after the surface has been cleaned and etched. The cleaning and etching procedure shall be to immerse in inhibited alkaline cleaner at 71' C for 5 minutes (Oakite 61A, Diversey 909 or equivalent in mix of 6 to 8 ounces per gallon of distilled water). Rinse in cold water. Etch in a sodium solution at 66' C for 5 minutes (0.5 ounce sodium fluoride plus 5 ounces of sodium hydroxide mix per gallon of distilled water). Rinse in cold water. Desmut in a 50% by volume nitric acid solution at 20' C for 2 minutes. Rinse in cold water. B) The anti-graffiti coating shall conform to the attached specification labeled Appendix “A”. 1.5 The housing shall have a door, securely sealed, which shall include substantially the full area of the front of the cabinet. 1.5.1 Gasketing shall be provided on all door openings. The gasketing shall be of a dusttight permanent type that will not peel off or deteriorate. Gaskets shall be closed cell neoprene and shall be installed with contact cement for a permanent bond. The mating surface of the gasketing shall be sprayed with a silicone lubricant to prevent sticking to said mating surface. 1.5.2 The lock for the front door shall be of the self-locking heavy duty five (5) pin brass tumbler cylinder rim type. It shall be keyed to a Corbin #2 standard. The lock shall be solid brass and have a “bull” nose/flat end on the latch pin. 1.5.3 When the door is closed and latched, with the key removed, the door shall be locked. The door shall be furnished with a three-point positive latching mechanism. 1.5.4 The three-point locking mechanism shall be fabricated so that it may be actuated by rotating a removable 5/8 inch hex key. The hex socket and locking cam shall rotate on a ½ inch minimum diameter shaft. The socket and shaft shall be fabricated from grade 2011P3 stainless steel. The socket and shaft shall be field-replaceable with common tools. The socket head shall be protected from being rotated with a pipe wrench or similar tool. One (1) aluminum hex wrench shall be provided with each cabinet. The hex wrench shall be designed to store behind the police door. 1.5.5 No part of the cabinet shell assembly including any protrusions from the power supply, power distribution assembly and police panel shall extend further than 7/8 inch in front of the plane formed by the front of the cabinet shell. No part of the cabinet door or any attachment to it shall extend further than 1.25 inches from the door into the area of the controller, cabinet drawer, detector rack, power supply, or power distribution areas. No part of the cabinet door or any attachment to it shall extend further than 2.25 inches in other areas except as specified for the police compartment. The EIA mounting racks shall be installed 2-5/8 inches back from the front plane of the cabinet housing. Tolerance for all the above dimensions is +/- 1/8 inch. 1.6 The cabinet shall be equipped with an automatic, self-engaging catch to hold the door open at 135 degrees +/- 25 degrees. The catch shall be capable of holding the door open in a 60 MPH wind coming at an incidence angle of 90 degrees referenced to the plane of the door. The front door shall have three aluminum hinges with stainless steel hinge pins along the right edge when viewed from the front. The hinges shall be welded to prevent removal of the hinge pins. The cabinet door hinges shall be bolted to the cabinet housing in a manner that prevent unauthorized personnel from removing the door with commonly available tools. 1.7 Each cabinet shall be provided with louvered vents in the front door with a removable nonmetal pleated media fiber air filter 16 X 12 by .875 inches deep. The filter shall overlap the vents by at least 1 inch and shall be held firmly in place with bottom and side brackets and a spring loaded upper clamp. Provisions shall be made in the design of the vents to prevent snow and rain from being blown through the vents into the cabinet, as shown in the enclosed figure “A”. The bottom filter bracket shall be formed into a waterproof sump which drains to the outside via the bottom row of louvered vents. The louvered vents shall be designed and constructed so that a stream of water from pressure head, such as a Rainbird sprinkler or other type sprinkler, will not enter the cabinet. The louvered area shall be less than the filtered area. The cabinet top shall be crowned and sloped to prevent standing water, and shall be constructed to shield the top of the cabinet door to prevent water from entering between the top door gasket and the cabinet. 1.8 Each cabinet shall be equipped with an electric fan with ball or roller bearings and a capacity not less than 100 cubic feet per minute. 1.8.1 The fan shall be provided with a screened exhaust vent with a 30 square inch minimum opening. The exhaust vent shall be designed to prevent the entry of snow or rain into the fan area and to drain any leakage as shown in figure “B1”
