Retrotec DU200 DucTester with DM-2 Manuel d'utilisateur télécharger pdf

SP802 Page 1 of 2 rev-2012-02-14

Residential duct leakage

measurement equipment comparison:

DucTester & Duct Blaster

Use this guide to compare features of the two top US manufacturers.

Retrotec’s DucTester

Speed control located inside the fan and connects to

gauge with umbilical that includes an Ethernet speed

control cable and all tubes.

The Energy Conservatory’s

Duct Blaster

Speed control located on the power cord and

connects to gauge with a mini jack.

Duct tester performance and applications

Duct testing standards for new houses typically limit the maximum acceptable leakage to 80 to

150 CFM whereas existing houses can have leakage up to an astonishing 300 CFM and still pass

some code requirements. Leakage above 300 CFM is difficult to measure because the air-

handler’s blower wheel would then represent a significant resistance and obscure leakage on the

supply side. Both duct testing systems will measure leakage well above these maximum

leakages. Both systems have about the same flow rate when depressurizing ducts which is the

easiest direction to test in because the negative pressure holds on the seal over the registers.

It was common practice to measure air handler flow rates using a duct tester but this method is

seldom used because neither unit can duplicate a 5 Ton system which could have 2250 CFM of

air-handler flow.

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SP802 Page 1 of 2 rev-2012-02-14 Residential duct leakage measurement equipment comparison: DucTester & Duct Blaster® Use this guide to compare

Page 2

SP802 Page 2 of 2 rev-2012-02-14 The Duct Testers (Fans) DucTester DU220 Duct Blaster® Flow: Maximum in free air: 725 CFM Maximum at 25 Pa:

Modèles reliés MN Duct Blaster

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