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NIS-CO Company offers various models of Make-Up Air Units for larger industrial plants ventilation requirements.

Negative Air Pressure in industrial manufacturing facilities can create problems such as:

* Exhaust fans losing performance Cheap Florida State Seminoles Jersey , as the building pressure becomes negative.

* Pilot light outages and exhaust system failure on natural draft gas equipment.

* Cold air drafts and infiltration of dirt and contamination from outside.

* Difficulty opening or closing exterior doors.

NIS-CO air-handling units (AHU) can be used effectively for negative pressure control at manufacturing facilities:

Space Pressure Control is used to minimize and control the exchange of air between the building and the outside environment or from one building area to another. This may be accomplished in three ways:

- Constant air supply with variable-speed exhaust;

- Variable air supply with constant-speed exhaust;

- Variable Return-Air.

Constant air supply with variable-speed exhaust is recommended where a hot or contaminated environment must be ventilated while maintaining room pressure. Unit may be interlocked to that it only operates with the exhaust system.

Variable Air Supply with constant-speed exhaust may be preferred where fume exhausters or fume hoods are used to provide critical ventilation of contaminants from a “clean” environment while make-up air is used to maintain a positive pressure to prevent infiltration.

In either case, when the system is enabled, a pressure sensor in the building space monitors room pressure. When a high or low pressure reading is detected Cheap Clemson Tigers Jersey , the air supply or exhaust is adjusted to compensate.

When controlling a Variable Air Supply unit (or VAV Unit - Variable Air Volume), two methods are available:

- Damper Control - Unit discharge damper is adjusted using the damper motor.

- VFD (Variable Frequency Drive) – Controller adjusts the speed of the blower motor Discharge Damper adjustment is an older method of controlling discharge air volume. Its main advantage is that it only requires positional control of a small discharge damper motor. The major disadvantage is the wasted Horsepower of the blower motor at lower delivery rates.

In recent years, fan speed control using VFDs has become economical. In this application Cheap Auburn Tigers Jersey , a standard energy efficient motor is usually adequate down to 75% of normal motor speeds. For a fan speed down to 25%, a premium efficiency motor is required. Inverter duty motors are not usually necessary since at 25% of normal fan speed, air delivery is minimal.

Variable Frequency Drives are also programmable. They are used to provide soft starts and to ramp motor speed up or down in response to signals from the control system.

Finally Cheap Alabama Crimson Tide Jersey , in a generally “clean” environment without a critical need to remove large quantities of contaminants, a simple solution to building pressurization is a Return Air Unit with the return air damper motor controlled by building a pressure sensor. When building pressure increases, more inside air is returned through the unit Wholesale NCAA College Jerseys , relieving the pressure. When building pressure falls, more outside air is supplied to the building in order to “pump up the pressure”. Precise control of building pressure by a single piece of equipment can thus be achieved.

Additional information can be found at the NIS-CO web site http:northernindustrialsupplycompanyproductsair_handling_units.

Oleg Cthetchel
Industrial Ventilation Systems Designer
NIS-CO Co.
nisco@nisco.net
http:northernindustrialsupplycompanyindex
http:northernindustrialsupplycompanyproductsindex


OSLO， Nov. 12 (Xinhua) -- Around 100 Norwegian rapid reaction police officers will get new， so-called "urban camouflage" uniform on Monday， newspaper Aftenposten reported on Saturday.


The current black uniforms are easily recognizable in crowds and from a long distance， which is why the new choice fell on a more subdued green color， the report said.


"It consist of pants， jacket and the upper part of the uniform. The new uniform will replace the coverall as daily uniform for our national emergency preparedness forces，" said Reidar Foss， police inspector in Norway's National Police Directorate.


Under the new uniform jacket， there is a solid place for bullet-proof and stab-proof vests， while the jacket pockets are specially made for other working tools. The material is flame retardant and has reinforced knee pads.


If the uniform passes a two-year test period， it might become future uniform of rapid reaction police forces throughout the whole country.

Identifying the Worst Effects among Opiate Abusers Published: 07.07.2010 | Author: jhonwilliamsd | Category: Health And Fitness

Opiates are extracted from the Asian opium poppy plant. Heroin is commonly abused opiate drug. Opiates such as Heroin are Central Nervous System depressants which slow the functions of both the brain and the body. Opiate addiction can wreck havoc on one鈥檚 physical appearance, leaving them look haggard Wholesale NCAA Jerseys , weak and droopy.


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