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Minimum Efficiency Reporting Value, commonly known as MERV, is a measurement scale designed in 1987 by the American Society of Heating, Refrigerating and Air-Conditioning Engineers ( ASHRAE) to report the effectiveness of air filters in more detail than other ratings. For example, often a high-efficiency particulate air ( HEPA) filter is ...
The NIOSH air filtration rating is the U.S. National Institute for Occupational Safety and Health (NIOSH)'s classification of filtering respirators. The ratings describe the ability of the device to protect the wearer from solid and liquid particulates in the air. The certification and approval process for respiratory protective devices is ...
In probability theory, the coupon collector's problem refers to mathematical analysis of "collect all coupons and win" contests. It asks the following question: if each box of a given product (e.g., breakfast cereals) contains a coupon, and there are n different types of coupons, what is the probability that more than t boxes need to be bought ...
The Nordstrom Anniversary Sale is in full swing and if you haven't shopped yet, there's still time. We combed through more than 5,000 items to find you the best deals under $50 — we're talking ...
An optical filter is a device that selectively transmits light of different wavelengths, usually implemented as a glass plane or plastic device in the optical path, which are either dyed in the bulk or have interference coatings. The optical properties of filters are completely described by their frequency response, which specifies how the ...
"I really wish they would make a TV mount option with a longer (10- to 12-foot) cord," said one buyer. "Overall the product is great, just didn't fit my specific needs." "Overall the product is ...
Between July 12 — 14, the chain is giving new app users $5 off in-store using the code FRENCHFRY. Arby’s In honor of National French Fry Day, Arby’s rewards members can score $1 any size ...
A low-pass filter is a filter that passes signals with a frequency lower than a selected cutoff frequency and attenuates signals with frequencies higher than the cutoff frequency. The exact frequency response of the filter depends on the filter design. The filter is sometimes called a high-cut filter, or treble-cut filter in audio applications.
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