low air - meaning and definition. What is low air
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What (who) is low air - definition

Ultra low penetration air; ULPA; Ultra-low penetration air

Ultra-low particulate air         
ULPA is an acronym for "Ultra-low Penetration Air (filter)". An ULPA filter can remove from the air at least 99.
Low Church         
CHRISTIAN DENOMINATIONS WITHOUT MUCH RITUAL OR EMPHASIS ON CHURCH AUTHORITY, AND NARROWLY EVANGELICAL IN THEIR TEACHING
Low Church; Low Churchman; Low Protestant; Low Anglican; Low churchman; Low-church; Low-Church
¦ noun a tradition within the Anglican Church giving relatively little emphasis to ritual and sacraments.
Derivatives
Low Churchman noun (plural Low Churchmen).
low-tech         
  • Handmade broom
  • Rotary [[clothesline]]
  • Traditional ploughing: a farmer works the land with horses and plough.
  • Candlelight used in electricity rationing in Oslo in 1948
  • Horse and cart in 2004
  • Skateboarding as a way of Low-tech mobility, in Mexico City
  • invented 1.7-2 million years ago]], being used for cooking in 2015
  • [[Cargo bike]] as a way of low-tech transportation
  • Zero waste as a way of low-tech living
SIMPLE TECHNOLOGY, OFTEN OF A TRADITIONAL OR NON-MECHANICAL KIND, SUCH AS CRAFTS AND TOOLS THAT PRE-DATE THE INDUSTRIAL REVOLUTION
Low-tech; Low tech; Low-technology
Low-tech machines or systems are ones that do not use modern or sophisticated technology.
...a simple form of low-tech electric propulsion.
? hi-tech
ADJ: usu ADJ n

Wikipedia

Ultra-low particulate air

ULPA is an acronym for "Ultra-low Penetration Air (filter)". A ULPA filter can remove from the air at least 99.999% of dust, pollen, mold, bacteria and any airborne particles with a minimum particle penetration size of 120 nanometres (0.12 µm, ultrafine particles). A ULPA filter can remove (to a large extent, not 100%) – oil smoke, tobacco smoke, rosin smoke, smog, insecticide dust.

It can also remove carbon black to some extent.

Some Fan filter units incorporate ULPA filters.

Examples of use of low air
1. Chaika on Monday deplored low air safety standards at a meeting of prosecutors and transportation officials.
2. The problem stemmed from the plane‘s air pressure system, Levitin said, with pilots registering low air pressure in the cockpit midway between Moscow and Irkutsk.
3. Dr Toff, who worked with Professor Mike Greaves, from the University of Aberdeen‘s School of Medicine, said: "Our study provides, for the first time, a carefully controlled assessment of the effects on blood clotting of the low air pressure and low oxygen level that might be found during a long–haul flight.