GBPI GB-MH180 – Mask Tightness & Quantitative Fit Tester (QNFT Method)

The GBPI GB-MH180 is a high-performance, automated mask tightness tester and quantitative fit testing (QNFT) instrument engineered to measure the facial sealing integrity, total inward leakage (TIL), and fit factor of filtering facepiece respirators (such as N95, FFP2, FFP3, and KN95), elastomeric half-masks, and full-face breathing apparatus. Built in strict conformity with international occupational safety regulations including OSHA 29 CFR 1910.134 respiratory protection standards and GB 2626, this system eliminates subjective qualitative sweet/bitter taste tests in favor of definitive numerical aerosol concentration counting.

Even a respirator fabricated from the highest grade 99.9% meltblown electret media fails to protect frontline personnel if peripheral gaps allow contaminated ambient air to bypass the filter matrix directly into the wearer's breathing zone. Operating as a state-of-the-art mask tightness tester, the GBPI GB-MH180 utilizes miniature condensation particle counter (CPC) optics. High-purity isopropyl alcohol vapor saturates the incoming aerosol stream; inside a cooled condenser block, vapor condenses onto sub-micron particles, growing them into optically detectable micro-droplets that pass through a focused laser beam for individual single-particle counting.

Dual-Port Sampling & Automated Fit Factor Calculation

The instrument features dual sampling ports that alternate automatically between ambient room air and air extracted from inside the respirator mask cavity via a silicone sampling tube. By comparing ambient particle concentration against inside-mask concentration during standard clinical movement protocols (normal breathing, deep breathing, head side-to-side, head up-and-down, talking, and bending), the internal microprocessor automatically calculates the quantitative Fit Factor (FF) and determines immediate pass/fail status.

Standalone Operation & Regulatory Compliance

Unlike bulky systems requiring external laptop computers, the GB-MH180 integrates an onboard industrial touchscreen controller running guided multimedia animation exercises. The system logs test operator IDs, subject demographics, mask model numbers, and full exercise data into an encrypted database supporting occupational health audits.

Widely deployed in hospital infection control departments, industrial chemical complexes, pharmaceutical cleanrooms, and occupational safety testing institutes, the GB-MH180 ensures verified individual respiratory protection.