Replacement Filters for Nibe

Nibe ERS and S735: different replacement functions

ERS S40-350/400 and ERS 10-400/500 sets use different dimensions. The S735 item is instead a single ISO Coarse extract-air filter, not an F7 + G4 set.

Compare the listed replacements

• Nibe ERS S40-350 / ERS S40-400 — F7 + G4
  Compatible Filter Set ePM1 60% + ISO Coarse (F7 + G4), 250 × 185 × 30 mm
• Nibe S735
  Compatible Exhaust Air Filter ISO Coarse (G4), 225 × 198 × 32 mm
• Nibe ERS 10-400, ERS 10-500, GV-HR 120-400, GV-HR 120-500 — F7 + G4
  Compatible Filter Set ePM1 + ISO Coarse (F7 + G4), 248 x 226 x 48 mm

Understanding F7 and G4

F7 is a former fine-filter class and G4 a coarse-filter class. Use the ISO classification declared for each replacement. Read the differences between F7 and G4 filters. Before changing class, check that the unit supports the configuration and resistance to airflow.

Can the S735 filter replace an ERS element?

Do not treat these as interchangeable. The S735 filter measures 225 × 198 × 32 mm; choose ERS sets from their individual product specifications.

How often should Nibe filters be replaced?

ZenAero's guide uses 4–6 months as an orientation for many residential installations, not a universal interval for this set. Follow the manual and assess each element and the air conditions; a damaged or heavily loaded filter may need earlier replacement. See replacement intervals and how to change ventilation filters.

These are ZenAero compatible replacements, not original Nibe filters. Check the supported models, pack contents and availability on each product page. For another brand, browse the ventilation filter catalogue.