Kanomax DALT-6905 Duct Airtightness Tester

Overview

The Kanomax DALT-6905 Duct Airtightness Tester is an engineered solution for quantitative leakage assessment of HVAC ductwork, fire-rated ventilation systems, and sealed enclosures under controlled pressurization. Based on the standardized fan pressurization method—per ASTM E1554, ISO 9972, and EN 1507—the instrument applies regulated positive or negative static pressure to a duct section or complete system while precisely measuring volumetric airflow required to maintain that pressure differential. This enables direct calculation of air leakage rate per unit area or total system leakage, in accordance with international energy efficiency and indoor air quality regulations. Designed for field deployment, the DALT-6905 integrates dual-nozzle architecture (large and small), real-time environmental compensation (temperature, barometric pressure), and high-fidelity pressure control to ensure traceable, repeatable measurements across diverse installation conditions—from mechanical rooms to rooftop units and underground service tunnels.

Key Features

• Dual interchangeable nozzle configuration: large nozzle (70–820 m³/h) for whole-system testing; small nozzle (4–70 m³/h) for localized or low-leakage segment verification—both tool-free, rapid-swap designs
• High-resolution measurement capability: flow resolution of 0.01 m³/h, static pressure resolution of 0.1 Pa, and temperature resolution of 0.1 °C
• Real-time environmental compensation: integrated temperature and atmospheric pressure sensors automatically correct volumetric flow readings to standard reference conditions (e.g., 20 °C, 101.325 kPa)
• Robust pressure control architecture: capable of sustaining stable ±2500 Pa static pressure with accuracy of ±1% of reading ±1 Pa—suitable for both low- and high-pressure class duct systems
• Portable form factor: net weight of 59.8 kg and compact footprint (480 × 627 × 1124 mm) optimized for SUV trunk transport without disassembly
• Intuitive human-machine interface: 5-inch full-color capacitive touchscreen with multilingual menu navigation, graphical real-time trend display, and context-sensitive help prompts

Sample Compatibility & Compliance

The DALT-6905 supports testing of rigid and flexible duct materials—including galvanized steel, aluminum, fiberglass-reinforced polymer (FRP), and fire-rated sheet metal—as specified in SMACNA HVAC Air Duct Leakage Test Manual and EN 1507 Annex B. It accommodates duct cross-sections from 100 mm diameter up to 2.5 m × 2.5 m rectangular configurations via adjustable sealing collars and modular gasket kits. All measurement protocols align with mandatory compliance frameworks: EN 12237:2003 (industrial ventilation), Eurovent 2/2 (energy performance certification), DW/143 (UK building regulations), AABC Commissioning Agents’ Standard, and China’s GB 50243–2016 (Code for Acceptance of Ventilation and Air Conditioning Engineering). Data output conforms to GLP audit requirements, with timestamped records including operator ID, test location, ambient conditions, and pass/fail status per selected standard.

Software & Data Management

The embedded firmware includes preloaded interpretation logic for 12 international duct leakage standards, enabling automatic pass/fail classification based on measured leakage rate, duct class (A/B/C per EN 1507), and surface area normalization. Each test record stores 16 metadata fields—including static pressure setpoint, actual pressure deviation, compensated flow rate, ambient temperature, barometric pressure, nozzle ID, and user-defined project tag. Up to 1000 full-session records are retained onboard with non-volatile memory. Data export is supported via USB 2.0 interface in CSV format compatible with Excel, MATLAB, and enterprise CMMS platforms. Firmware updates are delivered via encrypted USB stick with version-controlled checksum validation—no cloud dependency or internet connectivity required.

Applications

• Pre-commissioning verification of HVAC ductwork in commercial high-rises, hospitals, laboratories, and data centers
• Post-installation leak validation for smoke control and pressurization systems in fire safety engineering
• Periodic maintenance audits of aging duct infrastructure to quantify degradation and prioritize retrofit investment
• Third-party commissioning agent reporting for LEED v4.1 EQ Credit: Enhanced Indoor Air Quality Strategies
• Research-grade airflow characterization in building physics laboratories studying envelope-airtightness coupling effects
• Quality assurance during prefabricated duct module fabrication under ISO 9001-certified production lines

FAQ

Does the DALT-6905 comply with FDA or ISO 17025 calibration traceability requirements?
Yes—each unit ships with a NIST-traceable calibration certificate covering flow, pressure, and temperature transducers. Optional annual recalibration services are available through Kanomax-accredited labs meeting ISO/IEC 17025:2017 scope for airflow instrumentation.
Can the device perform simultaneous positive and negative pressure tests within one session?
No—it performs discrete positive-pressure or negative-pressure tests per session; switching requires manual polarity reversal of the blower motor wiring and re-zeroing of the pressure sensor, as defined in EN 1507 Section 6.3.
Is USB data export compatible with Windows, macOS, and Linux operating systems?
Yes—CSV files generated are plain-text and universally readable; no proprietary drivers or software installation is required.
What is the recommended maintenance interval for the flow nozzles and pressure sensors?
Visual inspection and cleaning with isopropyl alcohol every 200 test hours; full metrological verification recommended annually or after any impact event exceeding 1.5 g acceleration.
Does the instrument support custom leakage limit definitions beyond built-in standards?
Yes—users may define custom pass/fail thresholds using the “User Standard” mode, specifying maximum allowable leakage (m³/h per m²) at defined pressure differentials (Pa), with saved profiles accessible across sessions.