Genesis Top-Mount Indoor Air Conditioners are designed for mounting on top of enclosures. The exterior shrouds are made of low-carbon steel and few visible fasteners to survive rugged factory environments. They include a cleanable, reusable aluminum ...mesh filter which protects the coils for maximum cooling performance. Standard indoor air conditioners include the electro-mechanical thermostat, surge suppressor and condensate management system on MHB11 models.