Aprilaire ARN25F Quiet Energy Efficient Radon Mitigation Fan for Basement, Crawlspace or Slab Application, Indoor/Outdoor, 1500 and 2500 Square Feet: Amazon.com: Tools & Home Improvement
RadonAway GP501c Plastic Axial Radon Mitigation Fan Inline Duct Fan in the Duct Fans department at Lowes.com