Explosion-proof, 20,000 BTU air conditioner.For use with 6- and 12-drum fire-rated or 205- and 296-cu ft Agri-Turf™ lockers only.• For optimum temperature control, the appropriate size R-11 insulation package must be ordered when unit is purchased in conjunction with fire-rated models. • This accessory must be purchased in conjunction with a locker to ensure proper installation and to retain FM-approval. Not available on Non-combustible locker models.