NIBE Air Filter - 1 Pack - 060233 Filtering Efficiency: Captures >75% of coarse particles like dust and pollen. Low Airflow Resistance: Ensures longer servicing term and lower energy consumption. Material: Made from premium synthetic filtering material (SANDLER AG, Germany), tested according to ISO16890. Moisture Resistance: Operates even at 100% relative humidity, ensuring durability. Frame Construction: Moisture-resistant cardboard or synthetic frame, designed to adapt to ventilation unit construction without damage. Compatible with NIBE Air filter / Dust filter Filters for NIBE Heat Pumps NIBE S735-7 R EM 3x400 NL 066185 NIBE S735-7 R EM 3x400V 066134 NIBE S735-7 E EM 3x400V 066133 NIBE S735-7 CU EM 3x400V 066132 NIBE S735-4 CU EM 3x400V (066126) NIBE S735-4 E EM 3x400V (066127) NIBE S735-4 R EM 1x230V (066130) NIBE S735-4 R EM 1x230V (066129) NIBE S735-4 R EM 3x400V (066128) NIBE S735-7 E EM 3x400V 066235 NIBE S735-7 R EM 1x230V 066136 NIBE S735-7 R EM 1x230V UK 066137 NIBE S735-7 R EM 3x230 NO 066135 Unsure if compatible with your heat pump get in touch and we will be happy to help!