Based on this product's specifications, here are some alternatives and similar models
SpiroFlex replacement filter set for ventilation recuperators VENT CLEAR HA350 / HA500 / HA4 / HA5
Summary description:
Replacement filter set by SpiroFlex compatible with VENT CLEAR recuperator models HA350, HA500, HA4 and HA5. The set contains the filters required for air filtration in mechanical ventilation units, ensuring removal of dust and particulates and maintaining system hygiene. Designed for routine maintenance and seasonal replacement to preserve airflow and indoor air quality in residential or light-commercial ventilation systems.