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  2. STD-4C - Wikipedia

    en.wikipedia.org/wiki/STD-4C

    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.

  3. Centralized mail delivery - Wikipedia

    en.wikipedia.org/wiki/Centralized_mail_delivery

    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]

  4. Letter box - Wikipedia

    en.wikipedia.org/wiki/Letter_box

    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.

  5. Plumbing fixture - Wikipedia

    en.wikipedia.org/wiki/Plumbing_fixture

    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.

  6. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  7. Drain-waste-vent system - Wikipedia

    en.wikipedia.org/wiki/Drain-waste-vent_system

    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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