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Welcome to Tri-Dim® Filter Corporation's website. Tri-Dim is a leading manufacturer of HVAC filtration products, offering a full range of HVAC products and services – our products and services include:
In addition to reviewing our products and services you may also place an order through our E-order system or check the status of your order. You can also learn more about Tri-Dim and check for current job offerings.
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Come See Us at the AHR EXPO
Booth #5258 in Chicago at the McCormick Place on January 26-28, 2009
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TRI-NEWS - Spring Edition
The Spring Edition of the Tri-News is now available - articles in this issue include "New Product - Tri-Pure GSR2", "LEED Energy Savings", "IAQ Tip - Real World Efficiencies" and more.
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San Francisco Weighs Green-Building Law
SAN FRANCISCO—A proposed green building ordinance in San Francisco would require most new commercial and residential high-rises to meet LEED building criteria. If passed the ordinance would impact both public and private sector buildings.
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LEED®-Certified Buildings 25% More Energy-Efficient, Says Study
WHITE SALMON, Wash.—LEED®-certified buildings are delivering 25%–30% average energy savings in relation to noncertified buildings, according to a recent report by the New Buildings Institute. The study analyzes measured energy performance for 121 LEED-NC (new construction) buildings. It involved metrics such as energy use intensity, ENERGY STAR® ratings and measured results compared to initial design and baseline modeling.
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Study Links Filtration to Improved Microvascular Function
A team of scientists from Denmark and Sweden discovered that indoor air polluted with tiny particles that are breathed in and get into the bloodstream affected the performance of blood vessels, and potentially increased the risk of cardiovascular disease, in elderly people. When the air quality was improved using filters, their blood vessels worked much better.
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Public Review of ASHRAE Guideline 26P, Guideline for Field Testing of General Ventilation Filtration
This proposed new guideline provides test procedures for evaluating field-installed air cleaning devices for removal efficiency by particle size and for airflow resistance. Al-though not intended to serve as a filter-performance rating method, this guideline will give both users and manufac-tures a better knowledge of actual filter and installation properties. Theoretically it could be used to test any filter with an ASHRAE Standard 52.2 efficiency from MERV 1-16, but statically acceptable results for filters with perform-ance below a typical MERV 11 value bay be difficult to achieve.
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4th Public Review of BSR/ASHRAE/ASHE Standard 170P, Ventilation of Health Care Facilities
This fourth public review of proposed Standard 170 makes independent substantive changes to the third public review draft in response to comments received. It clarifies the requirements for reserve cooling, air handling unit design, pressure alarms, exhaust discharges and revises minimum requirements for filter efficiencies and certain space temperatures/humidities. Co-sponsored by the American Society for Healthcare Engineering (ASHE), Standard 170 aims to ensure high quality ventilation in health care facilities.
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Real World Efficiencies
Will a filter perform in your HVAC system the same way it performed in a test laboratory?
This is actually a very important question and one that is not asked or addressed frequently enough. Logic tells us that the answer is no. Test laboratories are controlled environments and ‘real world’ HVAC systems can be anything but controlled.
All filter testing standards are accelerated tests and utilize a ‘synthetic’ test dust to speed up the testing. The test dust is significantly different than ‘typical’ atmospheric dust (see photo above) and this can lead to distorted test results. These results can be even more distorted when you consider higher efficiency filters typically have prefiltration and are not exposed to large particulate like that present in the test dust.
Another common difference unlike what happens in the real world. Studies have shown that the bypass of unfiltered air can dramatically lower the effective efficiency of high efficiency filters.
ASHRAE 52.2, the current test standard, only utilizes the lowest efficiency numbers from the test to determine the efficiency rating – these numbers are almost always the initial efficiency numbers - this tends to under-represent what the efficiency will be after a dirt cake is formed during the filters life.
Another significant issue is efficiency degradation – certain medias that filters are manufactured with have electrostatic properties (sometimes additionally enhanced during manufacturing). These medias suffer a quick and dramatic efficiency loss when put into service and are unable to reach their rated efficiencies again. This phenomenon has been documented by numerous scientific studies. When these filters are tested under the current test methods the degradation in efficiency does not occur - so the minimum efficiency of the filter is dramatically overstated from what occurs in real world applications.
All of the above points can cause a filter not to perform as stated on a test report.
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1968 - 2008
Celebrating 40 Years of Innovation
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