AK Series 3 Walk-In Models: the next level of Quick Ship Coolers and Freezers. With 3 Day Lead-Times Amerikooler beats the competition when you need Cool fast! Crafted with only the highest quality materials, the best insulation, and our 50-Year Thermal Warranty- Amerikooler is a brand you can rely on.AK Series 3 models include indoor remote and/or self contained coolers and freezers in standard sizes; 6x6’, 6x8’ 6x10’, 6x12’, 8x8’, 8x10’, 8x12’, 10x10’, 10x12’.