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The simplest, fastest, most convenient duct air leakage tester in the industry.

Kanomax has developed the most advanced Duct Air Leakage Tester (DALT) for commercial duct systems.  It’s designed to be simple to use, accurate, and extremely convenient.  The instrument provides step-by-step test configuration and automated leakage testing based on the SMACNA HVAC Air Duct Leakage Test Manual, and and is accurate to ±2.5% of reading. Though built tough with an on-board, powerful motor, the DALT 6900 is very easy to transport on its pneumatic tires and leaves little to no footprint on the job site.

The instrument requires very little training due to the easy-to-follow, full color HD touch screen display through which the user can follow the step-by-step process and select from multiple choice configuration options.  The touch screen also allows the user to quickly toggle between measurement unit outputs like Fahrenheit and Celsius temperature units to m3/s, CFM, l/s, or m3/h airflow units.   Keeping further in line with simplicity, this duct air leakage tester does not require the use of orifice plates, which decreases the time required conduct a test as well as the room for error.  All of the parts that are needed for the leakage tests are already included with the unit, therefore the user will not have to research and order different pieces for different projects.  The only choice to be made is between the flow grid and the low-flow nozzle, which are both included and attached to the unit with professional grade, stainless steel cam locks.

The DALT 6900 can also perform both positive and negative (decay) pressure tests with a simple rearrangement of the hose, saving even more time for contractors that deal with a multitude of varying test requirements.

Check out the DALT 6900 User Manual for detailed instructions and images of the different stages of the testing process, or become an expert on the instrument’s use in 15 minutes by watching the DALT 6900 Video Guide

Automated commercial duct air leakage testing has never been easier.

Easy transport to the job with a small footprint and pneumatic tires allow for smooth movement

Step-by-step test configuration and automated leakage testing based on the SMACNA Test Manual Capable of both positive and negative duct leakage testings

Meets and/or exceeds the following standards for testing

  2. BS EN 12237:2003 EU
  3. BS EN 1507:2006 EU
  4. DW/143 EU
  5. Eurovent 2/2 EU
  6. GB50243 GB

· Our Duct Air Leakage Tester (DALT 6900), delivers the most accurate test results in either POSITIVE or NEGATIVE setting while delivering ±10 inches of water gauge pressure in the duct.

· Accurate to ±2.5% of READING of volume flow

· Stores data that can be downloaded easily to a USB flash drive for report generation from the commissioning engineer to the building owner or signing authority

· Engineered with the end-user’s perspective ensuring that it does what you need it to do and comes standard with a calibration* certificate.

· The instrument is designed for easy transport to the job with a small footprint and fits thru roof hatches 21″x 20″

· Order it with the optional Heavy Duty Construction Cover

*Kanomax offers annual NIST TRACEABLE calibrations at our facility in Andover, NJ.

Model DALT 6900
Air Flow Ranges Flow Grid: 21 to 377 CFM (36 to 640 m3/h)
Nozzle: 2 to 21 CFM (4 to 36 m3/h)
Accuracy 2.5 % of READING ± 0.1 m3/h
Resolution 0.01 m3/h
Pressure Ranges ± 10 in.wg (± 2500 Pa) Duct Static Pressure
Accuracy 1% of READING ± 1 Pa
Resolution 0.1 Pa
Temperature Ranges 32 to 140 °F (0 to 60 °C)
Accuracy ±0.5 °C
Resolution 0.1 °C
Absolute Pressure Ranges 20.6 to 38.3 in.Hg (70 to 130kPa)
Accuracy 2% of READING
Resolution 0.1kPa
Power Source DALT 6900-0E 110-120V, 1 Phase, 50/60Hz, 16A
DALT 6900-1E 220-240V, 1 Phase, 50/60Hz, 10A
Weight Approx.75kg (165lbs)
Dimensions W21 x D20 x H47 inches (54 x 50 x 120 mm)
Data logging Up to 1000 measurements
General Specifications
Interface USB
Datalogging YES
Warranty 2 years (except flex duct)
What’s Included Main unit, 2 x test fixture, 12 feet of flexible duct, silicone pressure tube, Power cord, Operation manual, Calibration certificate



Energy Balance & Integration LLC


Anthony Kocurek

EB&I purchased the DALT 6900 at the 2016 SMACNA Convention after seeing the demonstrations. We were impressed with the ease of set-up, use, and accuracy of the device and anticipated needing these attributes for some upcoming work. We have since used the machine for those projects and in several other applications where the airflows measured, the accuracy of the reading, and the repeatability of the readings were very important and had to be demonstrated. The DALT 6900 machine worked flawlessly and reliably in all of these situations.

However, in our opinion, the best part of owning and using this machine is the technical support that comes from the Kanomax Team. One of our projects required Kanomax to supply technical data about the machine, and the certification process of the machine, to a degree that is not normally asked for. The Kanomax Team went above and beyond expectations and did this without any hesitation.

I could not be any happier with both the machine and the Kanomax Team.

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