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  2. Perforated metal - Wikipedia

    en.wikipedia.org/wiki/Perforated_metal

    Studies have shown that perforated metals help reduce sound levels. [4] Studies have shown that having buildings use perforated metal sheets in front of their façade can bring in one study 29% energy savings (HVAC + Lighting estimated consumption in 1 year) and in the second one 45% energy savings (heating, ventilation, air conditioning).

  3. Home Depot - Wikipedia

    en.wikipedia.org/wiki/Home_Depot

    This is an accepted version of this page This is the latest accepted revision, reviewed on 16 February 2025. American multinational home improvement supplies retailing company The Home Depot, Inc. A Home Depot in Onalaska, Wisconsin Company type Public Traded as NYSE: HD DJIA component S&P 100 component S&P 500 component Industry Retail (home improvement) Founded February 6, 1978 ; 47 years ...

  4. Erector Set - Wikipedia

    en.wikipedia.org/wiki/Erector_Set

    Through 1932, Erector was sold in wooden boxes, but 1933 through 1962 the sets would be sold in colorful boxes made of painted steel. Early boxes were colored red, green, or blue; by the 1950s all set boxes were painted red. As the company grew, the area around the Gilbert factory became known as "Erector Square". [1]: 5–8

  5. Stairs - Wikipedia

    en.wikipedia.org/wiki/Stairs

    A stair flight is a run of stairs or steps between landings. A stairwell is a compartment extending vertically through a building in which stairs are placed. A stair hall is the stairs, landings, hallways, or other portions of the public hall through which it is necessary to pass when going from the entrance floor to the other floors of a building.

  6. Stair lift - Wikipedia

    en.wikipedia.org/wiki/Stair_lift

    Stair lifts are used by people of all ages and child car seats can usually be fixed a standard stair lift seat using the seat belt provided with the stair lift system. Many stair lifts are also fitted with a key, to allow the user to prevent others from using the lift. Codes of practice and technical specifications apply to stair lift manufacture.

  7. Milk crate challenge - Wikipedia

    en.wikipedia.org/wiki/Milk_crate_challenge

    [2] [3] The activity has faced criticism by health professionals for its unnecessary risk to personal health. [4] Social media platform TikTok , where the trend was popularized, said it would eliminate search results for "milk crate challenge" citing its policy that "prohibits content that promotes or glorifies dangerous acts."

  8. Escalator - Wikipedia

    en.wikipedia.org/wiki/Escalator

    The steps themselves are solid, one piece, die-cast aluminium or steel. Yellow demarcation lines are sometimes added to indicate their edges. In most escalator models manufactured after 1950, both the riser and the tread of each step is cleated (given a ribbed appearance) with comb-like protrusions that mesh with the comb plates on the top and ...

  9. Micro perforated plate - Wikipedia

    en.wikipedia.org/wiki/Micro_perforated_plate

    One early contributor to the theory of micro perforated plates as sound absorbers was Professor Daa-You Maa. [1] [2] Further possibilities aiming to improve the accuracy of Maa's original model are currently being investigated. One other major phenomenon that currently being investigated is the nonlinear effect i.e. an MPP behaves differently ...

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