IERV

AcronymDefinition
IERVInsect Endogenous Retro Viruses
References in periodicals archive ?
Filter Initial Efficiency Reporting Values (IERVs) with and without Bypass Site/Filter ID IERV Predicted Effective IERV with Bypass Ra1 5 5 Ra2 7 7 Ra3 11 8 Rb1 5 5 Rb2 11 8 Rc1 5 5 Rc2 6 5 Rc3 11 8 Rd1 5 5 Rd2 6 5 Rd3 11 11 Re1 5 5 Re2 7 7 Cf1 5 5 Cf2 6 5 Cf3 11 8 Cg1 7 6 Cg2 11 8 Ih 8 7 Ii 8 7 Ij 8 7 Ik 8 7 Il 8 7 Im 8 7 In addition to bypass around a filter, return duct leakage can cause the effective IERV to decline.
Bypass and Duct Leakage Flow Ratios and Efficencies Site/Filter ID Bypass Flow Return Duct Effective Effective IERV Ratio Leakage IERV with Bypass [[Q.sub.B]/ Flow Ratio with and Return [Q.sub.F]] [[Q.sub.L]/ Bypass Duct Leakage % [Q.sub.F]] % Rc1 7 8 5 5 Rc2 13 9 5 5 Rc3 9 9 8 8 Rd1 5 1 5 5 Rd2 6 1 5 5 Rd3 5 1 11 8 Re1 3 4 5 5 Re2 4 4 7 6 Cf2 7 25 5 5 Cf2 10 26 5 5 Cf3 10 26 8 7 Table 5 also shows the IERV that results from Equation 2 and application of the ASHRAE Standard 52.2-2007.
It should be noted that Table 1 is used for determining both IERV and MERV.
IERV and MERV for Constant Pressure Drop Full Tests Filter Type IERV MERV with Pybass MERV 7 6 6 MERV 14 12 11/12 Constant Fan Speed Initial Efficiency Reporting Values (IERV)
For the MERV 7 filter, IERV is reduced from a 7 to a 6 for the straight and U-shaped bypass tests.