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Confirmed Fit - Check Your Model: Dimensioned to 503 x 162 x 47 mm to match the original Zehnder cassette exactly. Fits ComfoAir Q350, Q350 TR, Q350 TR Enthalpie, Q450, Q450 TR, Q450 TR Enthalpie, Q600, Q600 ST, Q600 ST Enthalpie, ComfoBoxQ, AERISnext 350/450/600 and Wernig ComfortVent Q350/450/600. The rigid synthetic frame holds its shape in the warm, humid air inside a heat recovery unit, so it slides in, seats square and seals - no swelling, no forcing, no trimming. Lasts the Full 6 Months: Cheap filters clog long before their replacement date, and the system tells you: rising fan noise, weaker airflow, then a fault warning. Z-Pleat construction folds the media into deep, evenly spaced pleats that multiply the filtration surface inside the same frame. More surface area means more dust held before airflow resistance builds, so this Zehnder ComfoAir filter set is built to reach its six-month service interval instead of surrendering at six weeks. Complete Set of 2 - Replaces the Original: One G4 extract filter and one F7 supply filter, the full pair your ComfoAir needs for a single service. Direct replacement for Zehnder original part numbers 400100900, 400100901, 400100118, 400502013 and 400502015 - same fit, same service interval, made in the EU. Clean Air In, Protected Unit Out: The F7 supply filter (ISO ePM1 65%) captures the fine particles you cannot see before they reach the rooms where your family sleeps: traffic soot, urban smog, bacteria, mould spores and smoke. The G4 extract filter (ISO Coarse 85%) catches dust, pollen and lint on the way out, keeping the heat exchanger and fans clean. It is the difference between ventilating your home and filtering it. Made in the EU to ISO 16890: Classified to ISO 16890 at Coarse 85% and ePM1 65%, and manufactured in the European Union by production partners we work with directly, with our own quality checks on every batch. A filter that lasts its full interval replaces three that don't: a quarter of the filters, packaging and deliveries. Lower airflow resistance also means the fans draw less power every day, and a clean heat exchanger keeps the unit working for years longer.