CA HRV/ERV Filters CA 70 ERV (1) ComfoAir 160 HRV/ERV (2) ComfoAir 200 HRV/ERV (2) ComfoAir 350 HRV/ERV (2) ComfoAir 550 HRV/ERV (2) Focus 200 HRV/ERV (2) Novus 300 HRV/ERV (1)