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Make-up air system might consist of a wall-mounted NIS-CO propeller fan coupled with an automatic shutter or an inlet weatherhood and a control system to activate the fan motor. For rooftop installations http://www.stlouisbluesteamstore.com/adidas-luke-opilka-jersey , a powered NIS-CO hooded roof ventilator, which may contain a motorized shutter, can be used successfully. These systems would provide make-up air mainly for ventilation purposes.

Practically all air removed from a building is replaced by outside air at the same rate. Outside air will enter by any means available, when the inside air pressure is less than outside air pressure. This happens when exhaust exceeds supply systems capacity to replenish the building envelope with air. Possible consequences of this negative pressure differential are degraded exhaust system performance, loss of environmental control http://www.stlouisbluesteamstore.com/adidas-kyle-brodziak-jersey , adverse safety and performance effects on appliances which combust fuel and processes which vent gaseous products via natural draft, increased building structural loads, and excessive forces on exterior doors. Unfortunately, these problems occur where an inadequate amount of replacement or make-up air has been provided. A good make-up air system will alleviate all of these ills by providing the correct amount of replacement air. It may also reduce plant overhead by lowering heating, cooling http://www.stlouisbluesteamstore.com/adidas-klim-kostin-jersey , and ventilating costs.

In many areas, air must be conditioned before entering a facility. This necessitates that the make-up air system have heating and often air cooling and filtering abilities. A so called make-up air unit is required. Typically a make-up air system includes an air mover section, usually a propeller or centrifugal type fan, an air tempering section containing heating and where necessary cooling and filtering equipment, and a control system.

Fan selection and power requirements are generally determined by the application. When only general ventilation is required (fan pressure requirements are low) http://www.stlouisbluesteamstore.com/adidas-joel-edmundson-jersey , a propeller type fan can be utilized. To supply make up air through a duct system with a resistance of 0.5 in w.g. or more, a centrifugal fan should be considered. In either system, diffusers may be used to direct the discharge air velocity.

In situations where the inside air quality is acceptable, often a portion of the inside air may be drawn back through the make-up air unit where it is recirculated back into the building. Advantages of using NIS-CO Recirculating Make-Up Air units are lowered heating costs, better indoor air mixing (reduced air stratification) http://www.stlouisbluesteamstore.com/adidas-joe-mullen-jersey , as well as constant building pressurization.

In summary, an adequate amount of makeup air is required for personnel, machines, and processes to operate properly, efficiently http://www.stlouisbluesteamstore.com/adidas-jay-bouwmeester-jersey , and safely. Failure to provide adequate make-up air is often the cause of unnecessary expenditures for additional exhaust systems and heating or cooling equipment. These devices in turn compound the problem of air starvation within the building. Reliable, cost effective equipment is available from Buffalo Fan to supply the make-up air necessary to balance air removed from a structure.

For additional information please refer to http:www.ventilating

Oleg Tchetchel
Industrial Process Engineer
nis-co@nis-co
NIS-CO Fan Co.
http:www.ventilatingcontact
http:www.ventilatingproductsindex Chinese famous choreographer Yang Liping performs in her final dance drama "The Peacock" in Nanjing, capital of east China's Jiangsu Province, July 4, 2013. Chinese famous choreographer Yang Liping performs in her final dance drama "The Peacock" in Nanjing http://www.stlouisbluesteamstore.com/adidas-jake-allen-jersey , capital of east China's Jiangsu Province, July 4, 2013. Chinese famous choreographer Yang Liping performs in her final dance drama "The Peacock" in Nanjing, capital of east China's Jiangsu Province, July 4 http://www.stlouisbluesteamstore.com/adidas-jaden-schwartz-jersey , 2013. Chinese famous choreographer Yang Liping performs in her final dance drama "The Peacock" in Nanjing, capital of east China's Jiangsu Province, July 4, 2013. Chinese famous choreographer Yang Liping performs in her final dance drama "The Peacock" in Nanjing, capital of east China's Jiangsu Province http://www.stlouisbluesteamstore.com/adidas-ivan-barbashev-jersey , July 4, 2013. Chinese famous choreographer Yang Liping performs in her final dance drama "The Peacock" in Nanjing, capital of east China's Jiangsu Province, July 4, 2013. Chinese famous choreographer Yang Liping performs in her final dance drama "The Peacock" in Nanjing http://www.stlouisbluesteamstore.com/adidas-doug-gilmour-jersey , capital of east China's Jiangsu Province, July 4, 2013. "


HO CHI MINH CITY， June 14 (Xinhua) -- Fencer Do Thi Anh has become Vietnam's 20th athlete to qualify for the upcoming Rio Olympics， local media reported Tuesday.


Anh who ranked fourth in the recent AsiaOceania zonal Olympic qualifying tournament in China， was pushed up to third in the foil category to be granted the Olympic berth， daily newspaper Vietnam News reported.


The International Fencing Federation informed Vietnam that Anh got the ticket after Yuan Ping of New Zealand who finished second in the foil category， was ruled ineligible for the Olympics as the former Commonwealth champion previously competed under China jersey.


So far， Vietnam has secured 20 Olympian tickets in fencing， weightlifting， badminton， wrestling， shooting， gymnastics， swimming， athletics， rowing and judo. Local sports officials were waiting for more qualifiers in athletics and swimming.


Without winning any gold medals in past Olympic Games， Vietnam has brought home a total of two silvers in taekwondo from Sydney 2000 and in weightlifting from Beijing 2008.

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