Vent-Axia Sentinel Kinetic ISO 45% Coarse Filter 2 Pack 409764

Vent-Axia 409764 — Sentinel Kinetic FH ISO 45% Coarse (G3) Replacement Filter, Pack of 2.

The Vent-Axia 409764 is the genuine OEM ISO 45% Coarse (G3) replacement filter set for the Lo-Carbon Sentinel Kinetic FH MVHR unit, supplied as a pack of two. Formerly known as G3, this filter provides the minimum required filtration for the Sentinel Kinetic FH — protecting the heat exchanger from coarser airborne particles on both the supply and extract air paths and maintaining the airflow performance the unit was designed to deliver. 

Why Filter Replacement Matters for the Sentinel Kinetic FH

The Sentinel Kinetic FH is a flat, horizontal MVHR unit designed for loft and ceiling void installation in properties where conventional upright units cannot be accommodated. Like all MVHR systems, it operates continuously — drawing in external air, passing it through the filter media, and supplying fresh air to the habitable rooms of the dwelling. As the G3 filters progressively load up with captured dust and debris, airflow resistance increases, the system's ability to deliver its commissioned ventilation rates diminishes, and heat recovery efficiency falls. Regular replacement at the correct interval keeps the system performing to its SAP Appendix Q specification and supports Building Regulations Part F compliance across the life of the installation.

Genuine OEM Filters for Correct Fit and Performance

Using genuine Vent-Axia replacement filters ensures the correct physical dimensions and filter media specification for the Sentinel Kinetic FH's filter housings — an important consideration for a flat-format unit where dimensional tolerances in the filter frame may differ from other Kinetic variants. Vent-Axia recommends checking filters at three months post-installation to account for construction dust, then at least every six months, with replacement at least every twelve months — or more frequently in higher-pollution environments.

Key Features of the Vent-Axia Sentinel Kinetic FH G3 Replacement Filter 409764 Include:

• ISO 45% Coarse (G3) Standard Filter — Minimum Required Filtration Grade for the Sentinel Kinetic FH
• Formerly Known as G3 (EN779 Classification) — Now Classified as ISO 45% Coarse Under ISO 16890
• Pack of 2 — One Full Replacement Set per Pack (Supply and Extract Filters)
• Genuine Vent-Axia OEM Filter — Correct Dimensions and Media Grade for the Sentinel Kinetic FH Flat-Format Housing
• Protects Heat Exchanger Core — Prevents Particulate Build-Up That Reduces Efficiency and Airflow Over Time
• Compatible with Vent-Axia Lo-Carbon Sentinel Kinetic FH MVHR Units
• Essential for Maintaining Building Regulations Part F Compliance and SAP Appendix Q Performance
• Recommended Replacement Interval: At Least Every 12 Months (Check at 3 Months Post-Installation; Every 6 Months Thereafter)
• Sector: New Build, Residential

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