• Primary Compatibility: Engineered for Philips Respironics REMstar series machines, including the REMstar Pro, Pro 2, Plus, and Auto models.
  • Filter Type: Ultrafine (electrostatic/disposable). It blocks micro-particles like dust, pollen, and pet dander.
  • Function: Serves as the secondary, fine-particle defense system. It sits underneath or alongside a coarser, reusable gray foam filter.
  • Measuring roughly 3.5" x 1.5", it is explicitly built for legacy respiratory equipment
  • Non-Washable: Do not wash or rinse this white filter. Water ruins its microscopic composition and electrostatically charged fibers.
  • Replacement Cycle: Replace this filter every 30 days. Check it sooner if you live in a dusty environment or have shedding pets.