workplace environment, air-to-air heat, exchangers, particulate removal, clean air, keeptheheat, clean air, retain heat, saving energy in the workplace, get rid of lazy air, dirty air removal, lazy air, stagnant air forced out of enclosure, heat exchanger, welding smoke, humidity, diesel smoke, carbon monoxide, welding shops, machine shops, municipal garages, manufacturers, construction companies, electroplating, auto repair, facilities, fire departments, remove odors, energy savings, exhaust air, efficient heat recovery, healthier workplace, recycle your heat, no maintenance, fresh air intake, fresh air delivered to employees, heat transfer, one year warranty, winter heating bills reduced, outside air, ceiling temperature, fresh air, bring cool night air into your facility, wasting energy, ventilation, ventilation without heat loss, force dirty air out, 30 day delivery, push air out,