Retrotec Commercial 441 and 451 DucTester Manual de usuario descargar pdf (Pagina 41)

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©Retrotec Inc. 2015

How much duct surface area can be tested at one time?

The table below shows the maximum surface area that one Model 400 blower will test if the ducts just

pass. Since ducts will usually be tighter than the minimum specified, much larger areas can normally be

tested than those shown on the table.

Test Pressure,

in WC

Duct Leakage Class ( C

), CFM/100 square feet at 1 in WC

4,066

2,033

1,017

508

254

127

6,380

3,190

1,595

798

399

199

133

8,893

4,446

2,223

1,112

556

278

185

11,575

5,787

2,894

1,447

723

362

241

13,955

6,977

3,489

1,744

872

436

291

18,162

9,081

4,541

2,270

1,135

568

378

28,500

14,250

7,125

3,563

1,781

891

594

0.5

44,721

22,361

11,180

5,590

2,795

1,398

932

0.1

127,305

63,652

31,826

15,913

7,957

3,978

2,652

Duct Surface Area, square feet

Table 7 Duct Surface area that can be tested with one Model 400

The extrapolation feature in the gauge allows accurate readings to be taken at 0.1 in WC, so the bottom

row may be used to determine the surface area of duct that can be tested at one time. Duct systems

with larger areas will have to be broken down into sections using barriers and the results added up.

If you cannot achieve 0.1 in WC for the surface areas listed, the ducts will fail the test and must be

sealed up more before additional testing is attempted. Also look for disconnect and sections that are not

correctly blanked off. Check all temporary plugs, plates, sheets, balloons, bags used to seal intentional

openings.

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Retrotec Commercial 441 and 451 DucTester Manual de usuario Pagina 41

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