When open, doors admit people, animals, ventilation, and light.

When the ventilation does not match the perfusion through the paranchyema of the lung.

When CO2 concentrations are elevated indoors relative to outdoor concentrations, it is only an indicator that ventilation is inadequate to remove metabolic products associated with human occupancy.

* Tracheostomy — When patients require mechanical ventilation for several weeks, a tracheostomy may provide the most suitable access to the trachea.

When a train passes through the tunnel it pushes out the air in front of it toward the closest ventilation shaft in front, and " sucks-in " the air to the tunnel from the closest ventilation shaft behind it.

When the cause for the disease was discovered, the ventilation in the production process was improved, but the dangerous type of phosphorus were soon forbidden to use for matches.

When using any type of gas sterilizer, prudent work practices will include good ventilation ( 10 air exchanges per hour ), a continuous gas monitor for hydrogen peroxide as well as good work practices and training.

When working with the pitch, make sure you are working with gloves, safety glasses and good ventilation and as always, when working with any type of open flame, make sure there is an appropriate fire extinquisher close by.

When people or animals are present in buildings, ventilation air is necessary to dilute odors and limit the concentration of carbon dioxide and airborne pollutants such as dust, smoke and volatile organic compounds ( VOCs ).

When this is insufficient, the patient might require mechanical ventilation.

When presented in court with a document by the chief Auschwitz architect SS-Sturmbannführer Karl Bischoff, Leuchter misconstrued aeration ( Belüftung ) and ventilation ( Entlüftung ) as part of the furnace blower systems, when they were actually in reference to the ventilation channels in the walls that straddle the gas chambers.

When tested under laboratory conditions, the SIP, included in a wall, foundation, floor, or roof system, is installed in a steady-state ( no air infiltration ) environment ; systems incorporating fiberglass insulation are not installed in steady-state environments as they require ventilation to remove moisture.

When series production started by the end of the year, many details had been altered: brakes, ventilation system, grille and parking lights.

When combined with other systems in order to control the building climate, the whole system may be an HVAC ( heating, ventilation and air conditioning ) system.

When heat recovery is not required, it is typical for the device to be bypassed by use of dampers arranged within the ventilation distribution system.

When ranges lack proper ventilation, employees and users are exposed to lead dust from bullets or cartridge primers.

When making multiple copies of an original no more than four or five copies can typically be made at a time, due to the build-up of ammonia fumes, even with ventilation fans in the duplication room.

When using a BVM, as with other methods of positive pressure ventilation, there is a risk of over-inflating the lungs.

When ambient climent is not condusive, mechanical heat recovery ventilation systems, with a heat recovery rate of over 80 % and high-efficiency electronically commutated motors ( ECM ), are employed to maintain air quality, and to recover sufficient heat to dispense with a conventional central heating system.

When worn on the ground, the suit is attached to a portable ventilation unit — a hand-held device that supplies air to the suit, cooling it first with an ice filled heat exchanger.

When alveolar ventilation ( in liters of air per minute ) and alveolar capillary blood flow ( in liters of blood per minute ) are approximately equal, oxygen equilibrates across the alveolar-capillary membrane well before the blood has traversed the alveolus.

When they were closer and he saw that one was a woman, he was more puzzled than ever.

When the meal was ready, he told Jones to wash up, and going into the front room, woke the girl.

When they reached their neighbor's house, Pamela said a few polite words to Grace and kissed Melissa lightly on the forehead, the impulse prompted by a stray thought -- of the type to which she was frequently subject these days -- that they might never see one another again.

When he regained consciousness he was in Lord's house, in the office of Doctor Lord, the deputy's deceased father.

When it was followed by a second, whining even closer, Cobb swerved sharply aside into a depression.

When the sea was visible ahead of them, the relief was as great as if the sun had come out.

When she appeared at the store to help out for a few hours even my looking at her was surreptitious lest my Uncle notice it.

When our eyes met the air was filled with an unuttered message of `` Me, too ''.

`` When I was in college '', I grinned, `` I remember a poem I had to read in my lit class.

When they got to Shillong, in Assam, he was happy.

`` When I came up, damnit, I thought I was going down.

When he awoke in the mornings, she was in his mind and he could hardly wait to get to school to be near her in the flesh.

When he came back to the schoolhouse, his mind was made up.

When he finally left the sinister mansion on Perdido Street, he was carried out in a coroner's basket.

When he was eight he began violin lessons.

When the possibility that he had not given reconsideration to so weighty a decision seemed to disconcert his questioners, Mr. Eisenhower was known to make his characteristic statement to the press that he was not going to talk about the matter any more.

When he was stripped, deloused and numbered by his guards, his much-thumbed sketchbook was seized and thrown on a pile of prisoners' goods to be confiscated.

When her right hand was incapacitated by the rheumatism, Sadie learned to write with her left hand.

When Harold Arlen returned to California in the winter of 1944, it was to take up again a collaboration with Johnny Mercer, begun some years before.

When he was fifteen John H. Mercer turned out his first song, a jazzy little thing he called `` Sister Susie, Strut Your Stuff ''.

When he heard that Paul Whiteman was looking for singers to replace the Rhythm Boys, Mercer applied and got the job, `` not for my voice, I'm sure, but because I could write songs and material generally ''.