H1 (formerly D1) Environment Agency Stack Height Calculation Guidance

H1 was the Environment Agencies software tool to calculate the stack height for satisfactory dispersion of the substances handled. NOTE – It was WITHDRAWN in 2016 and is not their current guidance.  However, it is still a useful method for …

HSE Useful calculator

Visit the HSE Website to use a free online calculator for LEV assessors. It includes: Conversions Averages Volume flow Air change rate Air density Air velocity