Custom design and manufacture of HVAC equipment and specialty heat transfer systems for use in the industrial, military, nuclear, healthcare, research laboratory, and aerospace fields, namely, air cleaners, air conditioners, air filtration systems, air handlers, blowers, chillers, condensers, cooling coils, dampers, dehumidifiers, dehydrators, ductwork, fan coils, fans, HVAC systems and components thereof, namely, component motors and other HVAC system components, heat exchangers, heaters, heating coils, humidifiers, louvers, ventilation units, and nuclear safety related HVAC systems and components thereof; custom design and manufacture of portable shelters and trailers for use in the industrial, military, healthcare, research laboratory, and aerospace fields for housing mobile imaging facilities, communication systems, instrumentation systems, infectious waste treatment centers, high value electronics systems, weapons demilitarization systems, simulation and training centers, and command centers; custom design and manufacture of barrier panels, doors, and gates for use in the military, nuclear, and research laboratory fields