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Same as OEM Part# 1122446, 2 1/4" x 7/8" x 5/8"
Same as OEM Part# 1122518, 2 1/4" x 1"
This filter only fits the Philips Respironics DreamStation Series CPAP and BiPAP machines
Replacement Philips Respironics DreamStation Ultra-Fine Pollen Filters