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The STD-4C is the current USPS regulation for any centralized, wall-mounted mailboxes, whether located inside an office high-rise or within a new single-family subdivision as an outdoor centralized mailbox kiosk. New STD-4C compliant mailboxes are commonly referred to as centralized mail delivery equipment.
To represent the various levels of “approval” by the USPS, these wall-mounted mailboxes have been “rated”. Former approval standards were considered STD-4B+ and related to specific form factors and security levels of the mailbox. Today, STD-4B+ mailboxes are only USPS approved for replacing existing STD-4B+ applications. [2]
An attached or wall-mount letterbox, with a hook underneath for newspapers. Wall-mounted or attached mailboxes may also be used in place of mail slots, usually located close to the front door of the residence. They are known as "full-service" mailboxes when they have provisions for securing outgoing as well as incoming mail.
The visible water surface in a toilet is the top of the trap's water seal. Each fixture drain, with exceptions, must be vented so that negative air pressure in the drain cannot siphon the trap dry, to prevent positive air pressure in the sewer from forcing gases past the water seal, and to prevent explosive sewer gas buildup.
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Older structures may use asbestos, copper, iron, lead or clay pipes, in rough order of era of use. Under many older building codes, a vent stack (a pipe leading to the main roof vent) is required to be within approx. a 5-foot (1.5 m) radius of the draining fixture it serves (sink, toilet, shower stall, etc.). [ 2 ]
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