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

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 ventilation was not used such as in Crematoria IV and V ( although a ventilation system was later installed in Crematorium V in May 1944 ), Sonderkommando prisoners wore gas masks when removing the bodies.

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 someone in the audience rose and asked how does it feel to be a celebrity, Carl said, `` A celebrity is a fellow who eats celery with celerity ''.

When a dancer does well, she provokes a quiet bombardment of dollar bills -- although the Manhattan clubs prohibit the more cosmopolitan practice of slipping the tips into the dancers' costumes.

When a question contains two verbs, the response does not make clear which of them is being answered.

When helped by a high degree of structure in lesson presentation, then, and only then, does such a child attain unusual success.

When the frequency response characteristics of practical components are considered, their effect on stability does not present the most serious limit on the system loop gain.

When the writer uses material does he tamper with it to improve its commercial effect or does he leave it pure??

When her brother Winslow became a student at Brown University in 1874, she wrote him about a course in history he was taking under Professor Diman: `` What is Prof. Diman's definition of civilization, and take the world through, is its progress ever onward, or does it retrograde at times??

When someone does develop chronic or severe problems with anxiety, such problems are usually classified as being one or more of the specific types of Anxiety Disorders.

When Tarrou points out that " victories will never be lasting ," Rieux admits that he is involved in a " never ending defeat ," but this does not stop him from engaging in the struggle.

When Ares does appear in myths, he typically faces humiliation.

" When his wife reported to him that his interpreter's wife had boasted of her own husband's greatness, R. Abbahu simply said, " What difference does it make which of us is really the greater, so long as through both of us heaven is glorified?

" When does your Messiah come?

When using the works of his authorities Alexander does not only review their reasoning but also gives conclusions, expands on them, and offers his agreements and disagreement with them.

Hobbes said :" The Latines called Accounts of mony Rationes ... and thence it seems to proceed that they extended the word Ratio, to the faculty of Reckoning in all other things .... When a man reasoneth hee does nothing else but conceive a summe totall ... For Reason ... is nothing but Reckoning ... of the consequences of generall names agreed upon, for the marking and signifying of our thoughts ...."

When he returns home, Wallace ( Gibson ) falls in love with his childhood sweetheart, Murron MacClannough ( McCormack ), and they marry in secret so that she does not have to spend a night in the bed of the English lord.

When a monarch does act, political controversy can often ensue, partially because the neutrality of the crown is seen to be compromised in favour of a partisan goal, while some political scientists champion the idea of an " interventionist monarch " as a check against possible illegal action by politicians.

When the separation of scales does not hold, or when one wants to establish a continuum of a finer resolution than that of the RVE size, one employs a statistical volume element ( SVE ), which, in turn, leads to random continuum fields.

When the amount of RAM is not sufficient to run all the current programs, it can result in a situation where the computer spends more time moving memory from RAM to disk and back than it does accomplishing tasks ; this is known as thrashing.

When scientists want to express a specific protein in a cell that does not normally express that protein ( i. e., heterologous expression ), they will transfer the cDNA that codes for the protein to the recipient cell.

When scientists transfer a gene from one cell into another cell in order to express the new genetic material as a protein in the recipient cell, the cDNA will be added to the recipient ( rather than the entire gene ), because the DNA for an entire gene may include DNA that does not code for the protein or that interrupts the coding sequence of the protein ( e. g., introns ).

When the angle θ does not satisfy the above condition, the horizontal component of force exerted by the road does not provide the correct centripetal force, and an additional frictional force tangential to the road surface is called upon to provide the difference.

When the news of the victory is brought to David, he does not rejoice, but is instead shaken with grief: " O my son Absalom, my son, my son Absalom!

When found on the beaches, Calophyllum often extends over the lagoon water and supports nesting red-footed boobies, as does Barringtonia asiatica.