ANSI AIHA Z9.5 PDF

This new Standard replaces the one issued in and has a huge impact when it comes to energy efficiency in labs. After years of testing here in the United States and a review of European practices, a new minimum fume hood ventilation rate has been established. The biggest drivers of these outside air rates are the required hood minimum flows, thermal loads and air change rates. With the increased usage of demand based control of air change rates and the reduction of sensible heat loads in labs, the main driver in labs is now the required hood minimum ventilation rate.

Author:Kazralrajas Taucage
Country:Singapore
Language:English (Spanish)
Genre:Finance
Published (Last):4 May 2010
Pages:221
PDF File Size:4.68 Mb
ePub File Size:13.38 Mb
ISBN:975-5-72428-779-5
Downloads:81195
Price:Free* [*Free Regsitration Required]
Uploader:JoJorg



This new Standard replaces the one issued in and has a huge impact when it comes to energy efficiency in labs. After years of testing here in the United States and a review of European practices, a new minimum fume hood ventilation rate has been established.

The biggest drivers of these outside air rates are the required hood minimum flows, thermal loads and air change rates. With the increased usage of demand based control of air change rates and the reduction of sensible heat loads in labs, the main driver in labs is now the required hood minimum ventilation rate.

The previous standard called for a minimum of 25 cfm per square foot of fume hood bench area work space. This equates to around cfm for a 6 foot hood. The new standard changes this from a cfm per square foot to an air change rate.

Here is the exact verbiage from the new Standard: When attempting to save energy in typically higher hood density installations, minimum fume hood flow rates in the range of to hood air changes per hour ACH have been used to control vapor concentrations inside hood interiors.

An exception being where a written hazard assessment indicates otherwise. For purposes of establishing a value for the internal volume of the hood used in determining the flow rates corresponding to the desired value of hood air changes per hour, the internal hood volume is approximated and hereby defined as the total internal hood work surface area times the internal height of the hood.

For the average 6 foot hood, this means lowering the minimum exhaust from cfm to cfm. Why is this significant? In existing buildings with Phoenix Controls systems, this change could have huge energy savings potential.

We would be more than happy to do an analysis of your building to see what lowing the fume hood ventilation minimum could mean for you!

LAKSHANA SHASTRA MALAYALAM PDF

New Standard For Fume Hood Minumum Ventilation Rate

.

COMPLETE ADVENTURER 3.5 PDF

Laboratory Ventilation Package: ANSI/AIHA/ASSE Z9.5 and ANSI/ASHRAE 110

.

EMTP RV TUTORIAL PDF

.

Related Articles