Check Alpac and Helty filter codes, dimensions, Compact versions and filtration classes to identify the correct replacement.
To identify a replacement filter for an Alpac ventilation unit, start with the complete unit model, production period and code printed on the existing filter. The brand or commercial range alone is not enough. For Compact units made from June 2019, Alpac says that a Nuova Compact filter may be needed; confirm the code and dimensions rather than relying on the date alone.
Alpac offers ventilation solutions with different filter housings and layouts. A shared brand does not guarantee a shared filter size. Identify your unit before comparing replacements.
The Alpac replacement-filter guide distinguishes concealed units, integrated into a window assembly or wall, from surface-mounted units with a removable front cover. The COMPACT control-panel dimensions of 460 × 130 mm are not filter dimensions. Measure the actual replacement element separately.
Alpac notes that Compact units produced from June 2019 may require the Nuova Compact single filter, with a different code and size from the previous version. Units that look similar may therefore use different replacements. Check the manufacturing date on the identification plate or ask the manufacturer using the serial number. An installation date or invoice date is not necessarily the manufacturing date.
Helty belongs to the Alpac group, which explains why the names often appear together. Helty’s FlowEASY is a wall-mounted single-room heat-recovery unit, while Flow40 is a concealed unit. A replacement listing may cover several Flow and Compact models, but versions and configurations still need checking against the installed filter.
If the marking is unreadable, record the complete model, serial number, dimensions and photographs. Measurements help identification, but do not by themselves prove compatibility.
| Check | Where to find it | Why it matters |
|---|---|---|
| Unit type and full model | Identification plate and manual | Housings and configurations differ |
| Manufacturing date | Plate or manufacturer | Compact generations may need different filters |
| Filter code | Existing filter frame or label | The main reference for matching the replacement |
| Length × width × thickness | Direct measurement in mm | A poor fit can allow air to bypass the filter |
| Filtration classes | Filter label and specification | Check each air stream and version |
| Pack contents | Replacement specification | One element, a pair or a multipack are different quantities |
| Airflow direction | Arrows and manual | Fit each element in its intended orientation |
When comparing suppliers, establish whether the stated price covers one filter, a complete set or several sets. Check current specifications and availability with that supplier; this guide makes no supply promise.
Alpac’s historical filter information describes fine filtration on incoming air and coarse filtration on extracted air. This describes the functions of the two streams; it does not mean every model has two separate removable elements or the same ISO classes.
For the specific replacement with code 4VMC00000150 printed on the filter, the Helty specification lists ePM2.5 65% + ISO Coarse 90% on the incoming side and ISO Coarse 70% on the extract side. These ratings must not be extended to every Alpac or Helty filter.
F7 and G4 belong to the older EN 779 classification. ISO 16890 uses ePM1, ePM2.5, ePM10 and ISO Coarse ratings with a different test method. There is no exact universal conversion from F7 to one ISO class. Read the declared rating of the specific replacement. See our ISO 16890 guide.
A finer filter can capture a larger proportion of the relevant particle fraction, but pressure drop also depends on material, area, construction, airflow and loading. Class alone cannot establish airflow resistance. Use the filtration specified for the unit and position unless the manufacturer gives other instructions. Our F7 versus G4 guide explains the general distinction.
An original filter is made or supplied by the equipment manufacturer. A compatible replacement comes from another manufacturer and must have the dimensions and performance suitable for the intended housing. It is not an original part and should not be described as one.
If essential data is missing, ask the supplier before ordering. A similar shape or the same nominal class does not establish fit, sealing or performance.
The Alpac FAQ says to replace filters when the unit signals replacement and gives general advice of at least once a year. The Helty listing for 4VMC00000150 recommends at least every six months, more often in polluted areas. Follow the model manual, replacement instructions and the shorter applicable interval; the general annual advice does not override a specific six-month recommendation.
After replacement, reset the indicator using the procedure in the manual. Instructions differ by model. Our filter replacement interval guide provides general background.
Remove loose dust from the accessible housing as allowed by the manual. Deeper cleaning of the heat exchanger or internal components may require authorised service. Our MVHR and AHU filter replacement guide is a general outline, not a substitute for the unit’s instructions.
A building can contain similar-looking units installed or produced at different times. Keep a record for each apartment or unit:
This turns replacement sourcing into a check of specific codes and reduces the risk of mixing Compact generations.
Verifiable identification comes first: complete unit model, filter code, dimensions and air-stream configuration. A similar format does not prove compatibility. A combined element also needs the correct filter sections and sealing.
Collect photographs of the unit plate and old filter, the code, serial number and measurements. Ask the manufacturer or an authorised service centre for confirmation. Do not assume that a custom-sized filter is suitable: structure, stream sections, sealing and pressure drop also need verification for that unit.
Do not assume interchangeability. Alpac says units produced from June 2019 may need Nuova Compact. Match the code and measurements; a range name or date alone does not guarantee fit.
Only if the instructions for that specific filter permit it. Where replacement is required, washing or blowing the media is not an alternative.
Use the unit and replacement instructions. Alpac’s general FAQ mentions at least annual replacement; Helty recommends at least six-monthly replacement for 4VMC00000150. Observe the applicable shorter interval and warning indicator.
Not automatically. EN 779 and ISO 16890 use different methods. Read the specific filter’s declaration.
Record the full model, serial number and three dimensions and ask the manufacturer or service centre to identify the correct replacement.
All trademarks belong to their respective owners and are used to identify equipment and replacement compatibility. A third-party compatible replacement is not an original part. Always verify the full model, code, dimensions and specifications.
