The Class 100 (ISO 5) Pass Thru (pass through) module with a high velocity air wash of 100 FPM through a HEPA filter 99.99% efficient on particles 0.3 microns or larger, Laminated novaply, stainless steel or CRS inside and out, fire rated doors, please specify when ordering, Optional perforated stainless steel shelves for unobstructed air flow. Available in recirculating or non-recirculating models, Customer sizes quoted on request, Also available with ULPA, 99.999% or PTFE 99.9999% filtration.