Search results
Results from the WOW.Com Content Network
An example of a homemade unit. The Corsi–Rosenthal Box is a design for a do-it-yourself air purifier that can be built comparatively inexpensively. It consists of four [1] or five [2] [3] HVAC particulate air filters that form a cube and a box fan to draw air through the filters.
Common standards require that a HEPA air filter must remove—from the air that passes through—at least 99.95% (ISO, European Standard) [4] [5] or 99.97% (ASME, U.S. DOE) [6] [7] of particles whose diameter is equal to 0.3 μm, with the filtration efficiency increasing for particle diameters both less than and greater than 0.3 μm. [8]
Two proprietary scales are used to rate sub-HEPA air filters. The Home Depot scale is known as filter performance rating (FPR), and is reduced from a 1–10 scale to only 5, 7, 9, and 10. It measures ability to capture large particles, small particles, and weight change over the lifetime of the filter.
Heptafluoropropane (HFC-227ea) contributes to climate change.It has a global warming potential (GWP) of 3,220 over 100 years. [3]Due to its high GWP, the HFC-227ea has been included in the list of controlled substances of the Montreal Protocol (2016 Kigali amendment, in effect in January 2019). [4]
Bleed air in aerospace engineering is compressed air taken from the compressor stage of a gas turbine, upstream of its fuel-burning sections.Automatic air supply and cabin pressure controller (ASCPC) valves bleed air from low or high stage engine compressor sections; low stage air is used during high power setting operation, and high stage air is used during descent and other low power setting ...
The turbocharger increased power output to 127 hp (95 kW) for the B21FT, and 155 hp (116 kW) for the B21ET. 6.5 psi (0.45 bar) boost on the B21FT and 9 psi (0.62 bar) boost on the B21ET. Also new for the 1981 model year in Canada (previously introduced in 1979 outside of North America) was the B23, with a displacement of 2.3 litres (80 mm (3.15 ...
December 22, 2015: A B200 King Air crashed at Indira Gandhi International Airport in Delhi, India. All ten occupants were killed; one person on the ground was injured. February 21, 2017: A B200 King Air struck the roof of a shopping center building and crashed just after taking off from Essendon Airport in Melbourne, Australia. All five on ...
The Mercedes-Benz B-Class is a subcompact executive car manufactured and marketed by Mercedes-Benz since 2005. Based on the A-Class with larger dimensions, the European New Car Assessment Programme classifies it as a small MPV.