Vents Brig 300 Whole Home HRV Scratch and Dent Model filter set It includes a universal 4"

It includes a universal 4" and 5" inch metal duct adapter and a noiseless back draft damper as part of the unit

reliable airflow at up to 265 CFM

designed to deliver balanced fresh air ventilation for larger rooms

Vents Frigate 80R Whole House ERV (Cold Climate Ready) - Up to 93 CFM

Fits 8-inch round duct systems

Vents Brig 300 Whole Home HRV Scratch and Dent Model filter set It includes a universal 4"The Brig 300 Whole Home HRV is a high performance heat recovery ventilator designed to improve indoor air quality while helping reduce heating and cooling energy loss. This scratch and dent model offers the same core ventilation performance as a new Brig 300 unit, with minor cosmetic imperfections only. (see images) Scratch and Dent model one only. Full warranty included. Final sale no returns. Designed for whole home ventilation, the Brig 300 HRV