Click to expand Tap to zoom High Efficiency Filter SKU: GK 7500 Save $-1.00 Inquire about this product × Inquire about a product High Efficiency Filter Aerosol Therapy Name Email Phone Number Product Inquiry Message Submit Inquiry Ships from Glenwood Laboratories ( Oakville, ON) Need help? Call us at (905) 825-8244. Learn about our Shipping & Returns Policy. Have a question? Read our FAQs. HEPA Bacterial & Viral Filter (SIDE 1 - OD 22mm ID 15 mm & SIDE 2 - OD 25 mm ID 22 mm).