Field Testing ASHRAE Guideline 26-2012 Guideline for Field Testing of General Ventilation Filtration Devices and Systems for Removal Efficiency In-Situ by Particle Size and Resistance to Airflow Blue Heaven Technologies, Inc. Louisville, KY www.blueheaventech.com

Who Can Do it ?

Issues with In-Situ Testing? Why do In-Situ Testing? Compare Different Products Tests equipment under “Real World” Conditions It’s better than just standing around To Frustrate Others Issues with In-Situ Testing? Hard to Duplicate Test Conditions from test to test Easy to Manipulate Test Conditions Who Pays for it?

Basic Sampling System

You Must Sample Isokineticly or You Will FAIL!

ISOKINETIC SAMPLING Sampling in which the flow in the sampler inlet is moving in the same direction and at the same velocity as the flow being sampled.

Sample Nozzle

Flow to Particle Counter ISOAXIAL SAMPLING Allows for Isokinetic Sampling by adjusting flow at the sample nozzle instead of changing the nozzle size Flow to Particle Counter Sample Flow Adjust Flow in this “Outer Tube” by varying the vacuum pump flow rate so the counter maintains ISOKINETIC SAMPLING. Pump Flow

Iso-Axial Sample Probe

Upstream Sample Locations

Downstream Sampling Location

Really, This Worked at the Office?!?!?!

Particle Counter

Example Test Data – Filter 1 Size Range (µm) D1 U1 D2 U2 D3 U3 D4 U/S Avg D/S Avg 0.3 - 0.5   7154.167 5966.833 5634 6251.667 2354.333 2449 2314.333 2275.167 2348.208 0.5 - 0.7 562.5 448.5 399.6667 470.2222 133 128.1667 118.5 114.1667 123.4583 0.7 - 1.0 185.1667 141.1667 131.5 152.6111 29 29.66667 30 27.83333 29.125 1.0 - 2.0 179.1667 138.3333 115.5 144.3333 17.66667 21 16.33333 15.5 17.625 2.0 - 5.0 142.6667 108.3333 89.83333 113.6111 6.166667 4 2.666667 3.333333 4.041667 >5.0 12.66667 8.5 5.5 8.888889 0.666667 0.166667 0.25 Efficiency Calculations Average Standard 95% Upper 95% Lower (%) Efficiency Deviation Conf. Coeff. CV Eff 1 Eff 2 Eff 3 66.43 60.08 59.27 61.93 3.920 71.67 52.19 6.33 76.79 72.50 70.89 73.39 3.046 80.96 65.83 4.15 84.16 78.87 78.01 80.35 3.330 88.62 72.07 4.14 89.21 86.51 86.22 87.31 1.650 91.41 83.21 1.89 96.44 96.92 96.66 96.67 0.243 97.28 96.07 96.71 99.02 98.48 98.07 1.209 101.07 95.07 1.23

In-Situ Filter Comparison

Air Entry to Building

Entry House Access

Pre-filter Bank Upstream

Downstream of Pre-Filters

Velocity Traverse Ports