Holtop Eco-Smart ERV 2.5 Filters

Many Holtop-built housings can accept a denser F9 or HEPA-class filter on the supply side in place of the standard F7, capturing finer allergen particles. Because denser media increases resistance to airflow, it's worth checking your unit's fan capacity or maintenance manual before upgrading, particularly on smaller residential models.

No — using a correctly sized filter matching your unit's Holtop-spec filtration class doesn't affect the warranty on the heat exchanger core or fan assembly, since those warranties cover manufacturing defects rather than which filter brand you use. The requirement is almost always about correct sizing and filter class, not the label on the box.

Remove the filter and measure three dimensions in millimetres:

• Length
• Width
• Depth

Holtop's filter housings are produced in a relatively standardised set of sizes across their unit range, so an exact size match will almost always identify the correct replacement even without the specific model name.

Holtop units typically ship with a G4 or M5 coarse filter and an F7-class fine filter, following the same ISO 16890 conventions used across the European MVHR market. Original and compatible house brand options are available at the same filtration grade.

Holtop is one of the largest OEM manufacturers of heat recovery cores and units globally, and its components are used inside many private-label and regional MVHR brands sold under different names. If your unit's core or fan assembly carries a Holtop part number even though the outer casing shows another brand, our Holtop filter listings will likely be the correct match.