Mitsubishi Lossnay VL-500 filters

Lossnay is the name of Mitsubishi Electric's heat exchange element, not of the filter itself, so Lossnay VL and LGH series units use standard G4 or F7 class filters, just like other heat recovery units. The name Lossnay simply helps you recognise the right ventilation product line when looking for filters. The exact filter size is confirmed by the model number on the unit's housing sticker.

Filter compatibility generally stays within the same series and the same housing generation, but Mitsubishi has changed internal filter dimensions in some model updates, even while keeping a similar product name (e.g. within the VL or LGH-RVX series). The safest approach is to choose a filter based on the exact model number, or, if you can't find it, to measure the old filter directly before ordering a new one.

Lossnay units follow the standard 3–6 month interval, although many models have a built-in maintenance indicator that warns when airflow drops due to a dirty filter. It's worth treating this indicator as a useful reminder rather than the only criterion for when to replace the filter — especially in urban environments or near busy streets, where the filter gets dirty faster than the calculator suggests.

A properly matched F7-class filter is made for the same housing dimensions as the standard G4, so the change in air resistance is usually small and practically unnoticeable in everyday use. If you notice reduced airflow or increased noise after switching to F7, it usually means the filter needs to be checked more often — not that the F7 class is unsuitable for your unit.

You don't need to wait for a delivery from Japan. Our catalogue includes compatible filters made to the dimensions and filtration class of the standard Lossnay models, and in-stock items are dispatched within 1–2 business days to anywhere in Latvia. Only clearly marked items that are made to order have a longer lead time of 5–10 business days. Before ordering, check the exact Lossnay model code on the unit's label, since filter sizes vary between models and generations.

Most residential Lossnay VL and LGH series units come with a G4-class filter as standard, designed to capture larger dust particles. Some models also offer an F7-class filter as a supply-air upgrade option, which is better at capturing fine dust and pollen. Before choosing, check which class fits your specific model, as not all Lossnay variants support the F7 upgrade.