CamDuct :: Duct Pressure Testing

Duct Pressure Testing

Duct Leakage Testing Method Statement

Machine Model No. : DLT6-1200

Make : Extreme Performance Technologies

Testing Range : 45 sq m to 100 sq m under 2” pressure and 25 sq m to 80 sq m under 4” pressure

Calculate the surface area of duct section to be tested.
Connect the Flexible Adaptor of Testing Machine to the duct section to be tested.
Connect the Pressure Sensor to the duct.
Make sure all the openings of the duct are closed.
Switch on the machine and control the inlet flow to stabilize the duct pressure as required.
Allow the applied pressure to stabilize for two minutes.

Duct Leakage Test Procedure - For DW 143

Duct Leakage Test Procedure - For SMACNA

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Reference: Table - 31 Air Leakage Rates, DW/143
A practical guide to DUCT WORK LEAKAGE TESTING

	Duct Preassure in Inches/(Pascals)
100	0.54	0.18
200	0.84	0.28
300	1.10	0.37
400	1.32	0.44
500	1.53	0.54
600		0.58	0.19
700		0.64	0.21
800		0.69	0.23
900		0.75	0.25
1000		0.80	0.27
1100			0.29
1200			0.3
1300			0.32
1400			0.33
1500			0.35	0.120
1600			0.36	0.125
1700			0.38	0.130
1800			0.39	0.135
1900			0.40	0.140
2000			0.42
2100				0.144
2200				0.149
2300	F = 0.027 x P 0.65 - for Class A			0.153
2400	F = 0.009 x P 0.65 - for Class B		0.157
2500	F = 0.003 x P 0.65 - for Class C			0.162

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Reference: Table - 4.1 Applicable Leakage Classes
HVAC Air Duct Leakage Test Manual - SMACNA

Duct Class	1/2" 1" , 2" W.G	3" W.G	4", 6" , 10" W.G
Seal Class	C	B	A
Sealing Applicable	Transverse Joints only	Transverse Joints and Seams	Joints Seams and all wall penetrations
Leakage Class
Rectangular Metal	24	12	6
Round Metal	12	6	3

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Leakage Factor F in CFM/100 Sq Ft Duct
Reference : Appendix E, HVAC Air Duct Leakage Test Manual - SMACNA

Pressure	Leakage Class (CL)
P (w.g)	Class 3	Class 6	Class 12	Class 24	Unsealed Class 48
1/2	1.9	3.8	7.6	15.3	30.6
1	3	6	12	24	48
2	4.7	9.4	18.8	37.7	75.4
3	6.1	12.2	24.5	49.0	98.0
4	7.4	14.8	29.5	59.0	118.1
5	8.6	17.1
6	9.6	19.2
7	10.6	21.2
8	11.6	23.2
9	12.5	25.6
10	13.4	26.8

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