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Topic: Negative pressure

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	Negative Room Pressure to Prevent Cross-Contaminantion
		Negative Room Pressure to Prevent Cross-Contaminantion A negative pressure room includes a ventilation system designed so that air flows from the corridors, or any adjacent area, into the negative pressure room, ensuring that contaminated air cannot escape from the negative pressure room to other parts of the facility.
		To establish negative pressure in a room that has a normally functioning ventilation system, the room supply and exhaust airflows are first balanced to achieve an exhaust flow of either 10% or 50 cubic feet per minute (cfm) greater than the supply (whichever is the greater).
		Negative pressure in a room can be altered by changing the ventilation system operation or by the opening and closing of the room's doors, corridor doors, or windows.
	www.camfilfarr.com /cou_us/industries/care/negative_pressure.cfm (806 words)

	Wounds Articles - Negative Pressure Wound Therapy
		Successful closure with negative pressure wound therapy was achieved after conventional surgical treatment options were exhausted or unacceptable to the patients.
		Negative pressure wound therapy with instillation was utilized in conjunction with intravenous antibiotics from the fourth through sixth inpatient day.
		Abstract: Negative pressure wound therapy (NPWT) is a topical treatment used to promote healing in acute and chronic wounds by applying negative pressure to the wound bed.
	www.woundsresearch.com /Negative-pressure-wound-therapy (1570 words)

	Positive Air Pressure Negative Air Pressure Air Filtration System
		The positive air configuration is used in the Air Handler central air systems and may be used to feed clean air into a heat exchanger or air duct.
		The negative air configuration draws the contaminated air in through the bottom of the unit and blows it out through the top.
		This pressure draws outdoor air into the interior to replace the extracted contaminated air.
	www.airpurifiers-r-us.com /pos_neg_pressure.html (541 words)

	INSTITUTE OF PLANT ECOLOGY (Site not responding. Last check: 2007-10-28)
		We conclude that the pressure probe technique as it stands can not be used to measure the high tensions of up to 100 bars which have been found in the xylem of transpiring plants by indirect measurements.
		Negative pressures are created by cooling the probe capillary from the outside using dry ice (arrows).
		Heydt H, Steudle E (1991) Measurement of negative root pressure in the xylem of excised roots.
	www.uni-bayreuth.de /departments/planta/research/steudle/steu5a.htm (1386 words)

	Physics Today On The Web - Cover Story
		The pressure decreases because the local velocity increases towards the vortex core, in accordance with a general law of hydrodynamics established by Daniel Bernoulli in the 18th century.
		It is also important that the negative pressure be produced in the interior of the liquid, far from any wall at which heterogeneous nucleation could occur.
		When the pressure is made negative, the bubble grows, and at a critical pressure of around —2 bars, the electron bubble explodes—it becomes unstable and grows without limit.
	www.aip.org /pt/feb00/maris.htm (4210 words)

	Investigation of Negative Pressure Test Protocols for Wood- and Pellet-Burning Appliances
		The spillage resistance of wood burning equipment under negative pressure conditions is generally considered to be on the order of 5 Pascals, based on previous laboratory testing and field studies of wood burning stoves and fireplaces.
		Pressure control A barometric draft control was tested as a pressure-sensitive air inlet to the enclosure so that, as stove exhaust flow declined during tail-out, the target room pressure would be automatically maintained.
		At a negative pressure of 5 Pa the decline of flue temperature and pressure was more gradual, and the time to spillage was two hours or more for all tests.
	www.gulland.ca /NegativePressureTestProtocolRPT.htm (4593 words)

	Wound Care: Negative Pressure Therapy
		The degree of pressure to the wounded tissue is small, but when all areas of the wound work together in an effort to close toward the center point, the effect of negative pressure becomes impressive and results in quicker healing and resolution.
		Wall suctionin which negative pressure is delivered through a stationary unit mounted to a wallis appropriate in many clinical situations; however, it lacks the control mechanisms needed to provide safe negative pressure for wound care.
		Negative pressure wound care therapy has been proven to be a safe, cost-efficient modality for the treatment of wounds.
	endoflifecare.tripod.com /imbeddedlinks/id2.html (5239 words)

	ChemoSHIELD® Barrier Isolator (negative pressure)
		Large format, easy-to-read independent magnehelic gauges are positioned side-by-side to indicate relative negative pressure in the pass-thru interchange and the main work area with respect to the room.
		Gas-tight construction coupled with negative pressure prevents contaminants from the outside from entering the chamber and contaminants from the work area from migrating to the outside.
		Cabinet interchange negative pressure shall be visually verifiable by an independent magnehelic gauge on the main control panel.
	bakerco.com /products/chemoshield (2150 words)

	BIOMEDICAL RESULTS FROM SKYLAB - LOWER BODY NEGATIVE PRESSURE THIRD MANNED SKYLAB (Sec.5,Ch.29)
		The objective of the Skylab Lower Body Negative Pressure experiment designated M092, was to determine the extent and the time course of changes in orthostatic tolerance during the weightlessness of space flight and to determine whether in-flight data from the experiment would be useful in predicting the postflight status of orthostatic tolerance.
		Figure 29-12 shows mean values of systolic and diastolic pressure of the Scientist Pilot during rest and the 50 mm Hg phase of lower body negative pressure in all tests.
		Blood pressure responses were similar to those seen postflight in previous missions with marked elevations of resting systolic and diastolic pressures and, during negative pressure stress, additional large increases in diastolic pressure.
	lsda.jsc.nasa.gov /books/skylab/Ch29.htm (9133 words)

	Glossary
		Negative pressure respirator (tight fitting) means a respirator in which the air pressure inside the facepiece is negative during inhalation with respect to the ambient air pressure outside the respirator.
		Positive pressure respirator means a respirator in which the pressure inside the respiratory inlet covering exceeds the ambient air pressure outside the respirator.
		Pressure demand respirator means a positive pressure atmosphere-supplying respirator that admits breathing air to the facepiece when the positive pressure is reduced inside the facepiece by inhalation.
	www.biochemdefense.com /glossary.htm (650 words)

	Study Finds Wood Burners Prone to Spillage
		Air pressure in houses is complicated, because it's affected by several forces: wind blowing, a forced-air furnace circulating air, a clothes dryer running, and even the gentle force of warm air rising toward the ceiling on a cold day.
		In the wood stove house, average house pressure dropped as low as minus 5 pascals and the CO concentration peaked at 120 ppm.
		In the fireplace house, the lowest average house pressure reached minus 7.5 pascals, and the CO peaked at 80 ppm.
	oikos.com /esb/40/backdrft.html (883 words)

	NPV-Negative Pressure Ventilation
		The effectiveness of negative pressure ventilators depends upon many variables; the type of system used, degree of patient compliance, the integrity of the airtight seals, and the severity of the patient disease state.
		Nocturnal or intermittent ventilatory assistance with negative pressure ventilators has been shown to be effective in reversing mild hypercarbia with several disease states.
		If the patient is able to do so without an interruption in his/her speech when the negative pressure is being applied, the negative inspiratory pressure is not sufficient to capture and rest the patient's diaphragm.
	www.nemc.org /RespCare/npv.htm (803 words)

	Negative Pressure Isolation Rooms & Tuberculosis (TB) Isolation Rooms from Airmont
		Negative Pressure Isolation Rooms & Tuberculosis (TB) Isolation Rooms from Airmont
		Negative Pressure Isolation Rooms maintain a flow of air into the room, thus keeping contaminants and pathogens from reaching surrounding areas.
		Automatically increases air flow when doors are opened to maintain negative pressure and insure safety.
	www.airmontinc.com /negative-pressure.php (313 words)

	Commercial and Medical Air Purifiers, including Electronic Air Cleaners, HEPA Filters, Negative Air Pressure and More . ...
		Negative Pressure Equipment to Electronic Air Cleaners to HEPA Air
		Electronic Air Cleaners, Hospital Negative Pressure Air Purifiers, HEPA Filters, Living Air Sanitizers, and more to eliminate indoor air pollution.
		Electronic air cleaners are composed of electrostatic surfaces which act like magnets to attract positively charged airborne particles to their negatively charged surfaces, like the static charge that causes clothes to cling together in the dryer.
	www.airfiltrationsolutions.com (963 words)

	Positive Air Pressure Negative Air Pressure Air Filtration System
		The positive air configuration is used in the Air Handler central air systems and may be used to feed clean air into a heat exchanger or air duct.
		The negative air configuration draws the contaminated air in through the bottom of the unit and blows it out through the top.
		This system can be used to move contaminated air from indoors to outdoors through the air cleaner and create negative air pressure in the indoor space.
	www.allerairsolutions.com /pos_neg_pressure.html (541 words)

	Stargazer Planetarium Negative Pressure Domes
		The pressure differential does not need to be great, and the fan can run virtually silently.
		A Negative Pressure Dome can also be constructed in its own self-contained cylindrical frame.
		The frame is sealed and the air pressure reduced within the frame by using a fan.
	www.stargazer-planetariums.co.uk /negativepressuredomes.htm (333 words)

	08/27/1990 - Negative Pressure Glovebag Usage in Asbestos Removal
		We require the establishment of negative pressure enclosures for large-scale jobs to prevent the spread of asbestos contamination beyond the work area and to protect bystanders from excessive asbestos exposures.
		The negative air bag was determined to meet the intent of a negative pressure enclosure.
		The added expense to draw a negative pressure (the vacuum pump, a pressure regulator, and a moisture accumulator cost $850), the extra time it takes to set up the operation and monitoring which indicates that this procedure provides no additional protection makes the negative pressure glovebag a futile effort.
	www.osha.gov /pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=20066 (944 words)

	Blood Flow, Negative Pressure, and Hemolysis During Hemodialysis
		Negative pressure before the pump and positive pressure after the pump have only a small influence on the blood flow.
		Negative prepump pressures of _400 mm Hg or lower are sometimes needed to achieve such flows.
		The lower blood flow at the end of dialysis with essentially unchanged negative arterial (prepump) pressure is clearly related to the increased blood viscosity due to hemoconcentration.
	www.multi-med.com /homehemo/twardows/main.html (3652 words)

	Managing the Ins and Outs of Commercial Building Pressurization (Trane Engineers Newsletter 31-2)
		Ideally, the net pressure inside the building relative to outside should range from slightly negative or neutral during cold weather (minimizing exfiltration) to slightly positive during warm weather (minimizing infiltration).
		The result is a net negative pressure at the top of the building and a corresponding net positive pressure at the bottom.
		Return-air-plenum pressure must always be positive enough to establish relief airflow; the recirculating damper must therefore drop significant pressure between the negative mixed air plenum and positive return air plenum.
	www.trane.com /commercial/library/vol31_2/index.asp (4133 words)

	Negative Pressure Wound Therapy Pump for the Treatment of Acute and Chronic Wounds
		The negative pressure wound therapy pump (NPWTP) is a device intended to promote healing of acute or chronic wounds.
		An evacuation tube leads from the wound to a canister that is attached to a negative pressure pump.
		The use of a negative pressure wound therapy pump for the treatment of acute and chronic wounds, when a complete wound therapy program (defined under additional information) has been tried and failed or considered and ruled out, prior to the application of this device is considered medically necessary if the medical appropriateness criteria are met.
	www.bcbst.com /MPManual/Negative_Pressure_Wound_Therapy_Pump_for_the_Treatment_of_Acute_and_Chronic_Wounds.htm (1153 words)

	Negative pressure wound therapy options promote patient care
		Negative pressure wound therapy (NPWT) is a topical treatment intended to promote healing in acute and chronic wounds.
		The authors concluded that negative pressure treatment of purulent wounds in combination with surgical debridement significantly reduced the bacterial burden within the wound and resulted in improved wound healing.
		Subatmospheric pressure was directed at the surface of the wound in either a constant or an intermittent mode, based on the clinical experience of the physician, through an interface between the wound surface and a polyurethane sponge, which allowed for distribution of the negative pressure.
	www.biomech.com /showArticle.jhtml?articleID=170701858 (2201 words)

	QPC [ an buhlerprince, inc. corporation ]
		Air pressure outside the mold is always greater than pressure in the cooling channels so the fluid stays inside.
		Negative Pressure (NP) Water Circulating System pulls water through a mold or die at a lowered pressure using a progressive cavity pump.
		The QPC Closed Loop Negative Pressure, High Temperature Control System pulls cooling fluid through a mold or die at a lowered pressure by a centrifugal pump and a venturi.
	www.qpcsystems.com /negative.htm (802 words)

	Liquids Under Negative Pressure - Condensed Matter Journals, Books & Online Media \| Springer
		Negative pressure development during crystalization of polymers; A.
		A Quantum Monte Carlo study of the negative pressure regime in quantum liquids; J.
		Negative pressure tail of a reflected pressure pulse: A lattice-Boltzmann study; G.
	www.springer.com /west/home/materials?SGWID=4-10041-22-33594553-detailsPage=ppmmedia\|toc (402 words)

	Positive Pressure (Site not responding. Last check: 2007-10-28)
		Negative pressure systems generally pull all the air out of a greenhouse once a minute with fans and pads located on opposite walls.
		The advantages of positive pressure cooling, uniform temperature and insect restriction are a reality for a large commercial grower.
		Positive pressure cooling is now another tool for the modern grower to use to improve plant quality.
	www.agra-tech.com /positive_pressure.htm (827 words)

	ESA Human Spaceflight \| Users » Treadmill exercise within lower body negative pressure
		Although ISS crews exercise for about 2 hours per day to prevent bone and muscle loss, their bungee-cord loading apparatus is too uncomfortable to generate loads over 60-70% of total body weight.
		It seems that, on Earth, variations in blood pressure around the body have a strong influence on muscular and skeletal tissue systems.
		Separate studies have shown that using both the Lower Body Negative Pressure (LBNP)Chamber and the Flywheel Resistance Exercise Device reduced the adverse effects on the body during prolonged bed rest.
	www.spaceflight.esa.int /users/index.cfm?act=default.page&level=15&page=1844 (565 words)

	A Case of Negative Pressure Pulmonary Edema After Breast Implant Surgery (Site not responding. Last check: 2007-10-28)
		The diagnosis of negative pressure pulmonary edema was made based on immediate history, radiographic exams, and testing that ruled out myocardial infarction and pulmonary embolus.
		Negative pressure pulmonary edema (NPPE) is an uncommon but recognized complication of upper airway obstruction.
		Another explanation for NPPE holds that the highly negative intrathoracic pressures cause an increase in systemic venous return to the heart but a decrease in cardiac output, since pulmonary venous drainage to the left atrium is decreased.
	www.ispub.com /ostia/index.php?xmlFilePath=journals/ijpm/vol5n2/nppe.xml (1493 words)

	Saturn negative pressure
		Saturn is a negative pressure system with exhaust through the roof or the wall, and air inlet through the roof or from the loft.
		The system always operates with a negative pressure depending on the type and width of the stable, typically up to 30Pa.
		The dampers can be regulated by a combination of pressure, temperature and humitity to achive a constant image of the negative pressure in the stable.
	www.turbovent.dk /Default.asp?ID=293 (356 words)

	Negative Pressure Glove Boxes
		Two.5 "-thick plexiglass port caps are included with each Negative Pressure Glove Box to allow the 8" round arm ports to be sealed.
		These caps are recommended during processes with negative pressure in order to relieve strain on gloves and glove clamps (gloves must be ordered separately).
		This application, which supports sustained negative pressure to 5" WG in either the main chamber or the air lock, is ideal for degassing or applications with fuming chemistries.
	www.terrauniversal.com /products/animallab/al_gloveboxes/al_negativepress200.php (1552 words)

	Negative & Positive Pressure Air Purification Equipment for Hospital Isolation Rooms
		In this mode, air is ducted to the outdoors from one outlet for negative pressure and recirculated into the room from the other.
		It can be installed within the room to create negative pressure, or in an adjacent area to duct HEPA-filtered air and create positive pressure.
		This combination of HEPA filtration, negative pressure and UVGI disinfection is ideal for isolation rooms, ER, patient isolation during response to potential bioterrorism incidents or infectious illness outbreaks and during normal use.
	www.abatement.com /healthcare/patient_care_areas.htm (2278 words)

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