Retrotec DucTester 341 Manuel d'utilisateur télécharger pdf (Page 33)

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7. Set up the gauge to display Duct Leakage Results

Read the Total Duct Leakage results directly from the gauge. Change units by tapping on Channel B. In

order to compare duct systems in different homes/buildings, it is necessary to normalize the leakage

results for the size of the HVAC system and the size of the building. The two most common variables

used to normalize duct leakage are total HVAC flow rate and the floor area of the building.

Figure 24: Some of the most common results that can be read directly off the gauge.

7.1 Mode setup for duct testing in the US

The Table below shows what settings will directly calculate the results required for testing compliance

with the codes adopted in the various states.

Table 3: Gauge Mode Setup for US state Codes and programs for Duct Testing

Code

2009

IECC

ENERGY

STAR

Northwest

ENERGY STAR

Homes

Title-24

Code

WA State

Code

Region:

VT GA CT DE

GA ID IL IO

MA NC NH NJ

NY OH TX

USA

ID MO OR WA

Pressure

Flow

CFM

(Flow) @ Pressure

@25 Pa

@50 Pa

@25 Pa

Flow per Area of

Conditioned floor area

CFM/100 ft

CFM/ft

Off

CFM/100 ft

(Flow per Area) @

Pressure

@25 Pa

@50 Pa

Off

@25 Pa

Grey areas in the table indicate those results are not needed for those programs but can be turned on or

off any time they may be needed. The “@ Pressure” value for Flow measurement is set at the value

required for duct testing.

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Retrotec DucTester 341 Manuel d'utilisateur Page 33

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