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Welcome to Tri-Dim Filter Corporation
ASHRAE Publishes 2013 Version of IAQ Standard PDF Print E-mail

The 2013 version of ANSI/ASHRAE Standard 62.1-2013, Ventilation for Acceptable Indoor Air Quality, consolidates the 2010 standard and 10 published addenda. "The 2013 version of Standard 62.1 continues the trend of increasing clarity while adding flexibility," said Roger Hedrick, chair of the Standard 62.1 committee. Significant changes to the newly published version include the modification of the Zone Air Distribution Effectiveness table to increase the ventilation effectiveness of certain underfloor air distribution systems, modification of the requirements for the quality of water used in humidification systems, and clarification of building level pressurization requirements.

Source: The HVAC&R Industry

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Last Updated on Thursday, 31 October 2013 13:59
ASHRAE 52.2 - Proposed Changes PDF Print E-mail

ASHRAE 52.2-2012 is the current revision of the HVAC industry’s air filtration test method.  Because it is a standard that is under continuous maintenance, addenda are published between the 5 year revisions to make any changes ASHRAE deems fit.

The next addendum to be published, possibly as early as mid- to late-2014, is known as “Addendum a”.  The addendum will make changes to the MERV tables, Table 12-1 and Table J-2 in the standard.  The changes address key issues regarding variability of the standard, specifically the MERV 8 through 11 overlap issue and the need for each range to be consistent with the lower limits of the other ranges.

The proposed Addendum a is currently out for a 45-Day Public Review Period from Aug 23, 2013 to Oct 7, 2013.  After the closing of the public review, all comments will be assembled and sent to the SSPC-52.2 Committee.  The committee will review and discuss the comments at the next meeting, scheduled for Jan 18, 2013 during the ASHRAE 2014 Winter Conference in New York City.  If you wish to review Addendum a and possibly comment, go to

Last Updated on Friday, 06 September 2013 14:31
CDC: Airports that allow smoking pose health risks PDF Print E-mail

Ventilation at major U.S. airports with designated smoking areas does not protect passengers from the health risks of secondhand smoke, said the Centers for Disease Control and Prevention (CDC) in a study released Nov. 20. The CDC study compared air quality at airports with and without smoke-free policies. It found that pollution levels 1 m (3 ft) adjacent to smoking areas are five times higher than levels at airports that entirely ban smoking. Levels inside smoking areas, including bars and restaurants, were 23 times higher than at smoke-free airports. Five of the 29 largest U.S. airports, which together accounted for about 15% of U.S. air travel last year, allow smoking in designated public areas. They are Hartsfield-Jackson Atlanta International Airport, Washington Dulles International Airport, McCarran International Airport in Las Vegas, Denver International Airport and Salt Lake City International Airport.

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Last Updated on Friday, 30 November 2012 18:36
China Willing to Pay for Cleaner Indoor Air PDF Print E-mail

BEIJING—Cleaner indoor air is becoming a priority in the pollution-heavy cities of China. After companies were awarded contracts this spring to install equipment for air pollution control in Galaxy Soho, a high-end commercial complex in downtown Beijing, they received more than 50 similar inquiries from entities such as the Beijing municipal government and large telecom companies. Citizens’ heightened awareness of rising indoor air pollution levels is rendering air purifiers a new favorite of Chinese households. One Swiss supplier reported a tripling of its sales in China, despite selling its home air purifiers for $2,000 to $3,000 apiece. A recent report by TechSci Research projects the Chinese market for air purifiers to grow 34% a year for the next five years.

Source: The HVAC&R Industry

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Last Updated on Thursday, 24 October 2013 17:49
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