ACGIH-aligned LEV design, commissioning, and periodic validation
LEV systems capture contaminants at source — the highest-tier engineering control. We design and validate LEV per ACGIH IV manual, HSE HSG 258, and ISO 16453, covering hood design, duct sizing, fan selection, and TExT (thorough examination and test).
A practical, phased delivery approach — from gap assessment through operational embedding — built around your regulatory context.
Define LEV design brief — contaminant profile (gas, vapour, particulate, fume, mist), generation rate per ACGIH Industrial Ventilation Manual; design intent per EN 689 / EN 14175 (fume hood); align with HSE HSG 258 / HSG 37.
Design hood per ACGIH IV / HSE HSG 258 — capture hood (slot, panel, enclosure), required capture velocity per contaminant generation, hood static pressure (HSP) target; align with VS schematics from ACGIH Industrial Ventilation.
Design duct per ACGIH IV — transport velocity per material (1000-1400 fpm for vapour, 2500-3500 fpm for fine dust, 4000-4500 fpm for fibrous); duct material selection per contaminant; specify duct sizing and pressure-loss calculation.
Specify air cleaner per contaminant — baghouse / cartridge (particulate), wet scrubber (acid gases), activated carbon (VOC), HEPA (high-efficiency particulate), thermal oxidiser (combustible VOC); align with EPA emission standards.
Select fan per system curve and operating point — centrifugal (forward-curved, backward-inclined, radial, airfoil), axial; specify motor (premium-efficiency per IE3 / IE4), VFD (variable-frequency drive) for energy optimisation; align with AMCA.
Validate per HSE HSG 258 / EN 14175 / ANSI Z9.5 — face velocity (typically 80-100 fpm fume hood, capture velocity per design), static pressure verification, smoke testing, tracer-gas testing; conduct annual thorough examination / test.
Speak with our team to scope an engagement tailored to your facility, regulatory context, and lifecycle stage.