Airtightness of the ventilation ducts
An airtight building envelope is an important prerequisite for implementing up-to-date energy designs in new buildings as well as during building projects in existing buildings. In order to guarantee hygienic indoor air, fresh air supply through controlled room ventilation is the most sensible solution.
Blowerdoor Micro Leakage Meter (MLM) system
Blower Door
Blowerdoor Micro Leakage Meter (MLM) system
1
The airtightness of the ventilation ducts installed is an important requirement for the functionality and efficiency of ventilation systems. Leakages in the ductwork impede the targeted distribution of air in the building. Consequently, the high level of air quality planned is not achieved. Leaky ventilation ducts impair the efficiency of ventilation systems, in particular of those with heat recovery.

The measuring principle
The ventilation systems are tested by ventilation strands. When testing the supply air ducts, the MLM is, for example, connected to the supply air valve. All other valves and the supply air duct at the central unit are closed with rubber bladders. Using the Minneapolis DuctBlaster fan and the pressure gauge DG-700 (included in the BlowerDoor Mini- Fan Measuring System) negative (testing exhaust air ducts) or positive (testing supply air ducts) pressure is created. The measuring results are documented in the test report.

Standard set: Transport bag with MLM flow meter including 4 discs in a padded bag, calibration certificate (4 discs of 5 measuring points each), measuring software TECLOG3 including test report, 2 hoses connecting plates for DuctBlaster fan, connecting hoses of 1 m and 3 m, 4 hose clamps, 5 connecting pieces for ventilation systems, sample roll of Duct Mask, set of rubber bladders, 1 capillary tube, tube set (red and blue of 3 m each, transparent of 10 m), reference guide., DuctBlaster including rings 1–4 and calibration certificate, speed controller, DG-700 with calibration certificate, reference guide, transport bag.
Price 4780,00 without VAT
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Existing functions
Main features
Measuring range at 250 Pa pressure differential
Range
2,15 m³/h ... 57,4 m³/h
Measuring accuracy with disc 1 or 2
± 5 % or ± 0.37 m³/h of the measured value
Measuring range at pressure 160 Pa differential
Range
2,15 m³/h ... 69,7 m³/h
Measuring accuracy with disc 1 or 2
± 5 % or ± 0.37 m³/h of the measured value
Measuring range at pressure 80 Pa differential
Range
0,17 m³/h ... 78,5 m³/h
Measuring accuracy with disc 1 or 2
± 5 % or ± 0.37 m³/h of the measured value
Measuring accuracy with disc 3
±5 % or ±0.09 m³/h of the measured value
Measuring accuracy with disc 4
±0,04 m³/h
Software
TECLOG MLM
Complies with standard
LST EN 12599:2001/AC:2005
Additional features
Dimensions
L 300 mm, Ø 140 mm
Weight
800 g
Special accessories
Price 4780.00 without VAT
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