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Manufacturer of MVHR

Joule 2

Model

InvaVent 2

Model size

350 2

Air handling unit

InvaVent 350 2

Filter dimensions

395x197x15 1
398x198 1

Protection level

Basic: larger solid particles, dust, fluff. 1
High: fine particles, dust, pollen, mold spores, combustion particles, smog particles, insecticide dust. 1

Manufacturer

CleanFilter 2

Filter

New posts

Heat Recovery Ventilation Winter Problems: Frost Protection, Preheaters and Filters (Rotary vs Plate)

date_range 30 January 2026
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During the colder months, the performance of a heat recovery ventilation unit depends strongly on the type of heat exchanger used. Rotary exchangers usually operate more continuously, but the supply air may feel cooler, meaning additional heating is sometimes needed for comfort. Plate heat exchangers, on the other hand, may switch to protective modes more quickly in low outdoor temperatures, and without a preheater, stable ventilation can become limited. In this article, we explain real-life scenarios: when reducing airflow makes sense, why filters clog faster in winter, and how to lower energy consumption while maintaining a healthy indoor climate.

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Indoor Humidity in Winter: Why It Drops to 20–30 RH and How to Control It (Heat Exchanger Comparison + Practical Solutions)

date_range 18 January 2026
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In winter, outdoor air becomes very dry once it is heated indoors, and mechanical ventilation often reduces indoor relative humidity to 20–30 RH or even lower. This article explains why this happens, how different heat exchanger types (plate, condensation rotor, enthalpy, sorption) affect indoor moisture balance, and what you can do in practice. We cover smart ventilation control during cold nights, protection against excessive drying, when a humidifier is really needed, and simple ways to increase or reduce humidity naturally. You will also find an FAQ with common real-life situations and climate-specific recommendations for different countries.

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Why Your Heat Recovery Ventilation (HRV) Can Freeze in Winter — and How Frost Protection Works

date_range 07 January 2026
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Cold outdoor air and warm, humid extract air can create condensation that may freeze inside the heat exchanger. Learn what “defrost” does, why airflow balance matters, and how to reduce frequent frost cycles.

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JOULE Filters

Advanced Filters for JOULEHeat Recovery Ventilation Units (MVHR)

Elevate indoor air quality with our top-tier analog JOULE filters, designed for perfect compatibility with InvaVent series MVHR. These filters optimize performance and provide robust protection against pollutants.

Our wireframe and panel JOULE filters rigorously adhere to ISO 16890 standards, with exceptional filtration efficiency confirmed by FIATEC lab tests in Germany. Crafted from EU-sourced high-quality materials, our innovative 3-layer filtration material ensures optimal performance.

Choose from our range of InvaVent filters:

- G4: Basic Protection (Lint, Dust)

- M5: Medium filtration of PM10 particles (Pollen, Mold spores, Dust, etc.)

- F7: Precision PM2.5 and PM1 Particle Filtration (Smog particles, Pesticide dust, Pollen, Mold spores)

- F7/AC: activated carbon ePM2.5 class filters for full smog filtration: Volatile particles (Odor), Harmful gases (NOx, O3, etc.), fine particles.

Benefits:

- Low prices.

- Tested efficiency

- Extended filter lifespan.

Includes a 2-year storage guarantee. Trust in our EU-manufactured filter excellence.

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InvaVent 350 F7+M5 Filter set (Efficient)

£26.81 £24.13

Ex VAT: £20.11

Manufacturer of MVHR	Joule
Manufacturer	CleanFilter
Air handling unit	InvaVent 350
Filter dimensions	395x197x15
Class EN779	F7+M5
Class ISO16890	ePM1 70%
Protection level	High: fine particles, dust, pollen, mold spores, combustion particles, smog particles, insecticide dust.
Quantity of filters	2
Advantages	Lower running costs – lower filter price, lower energy use, and usually longer time between replacements than higher-efficiency filters. Made in the EU – reliable quality and strict safety standards Airtight. Pollutants will not pass through a filtering material and a frame connection.

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InvaVent 350 G4+G4 Filter set (Economy)

£5.84

Ex VAT: £4.86

Manufacturer of MVHR	Joule
Manufacturer	CleanFilter
Air handling unit	InvaVent 350
Filter dimensions	398x198
Class EN779	G4+G4
Class ISO16890	Coarse 65%
Protection level	Basic: larger solid particles, dust, fluff.
Quantity of filters	2
Advantages	Lower running costs – lower filter price, lower energy use, and usually longer time between replacements than higher-efficiency filters. Made in the EU – reliable quality and strict safety standards German filtration material – hygienic (VDI 6022) and PFAS-free, for cleaner and safer air ISO 16890 tested – performance verified by an accredited laboratory in Germany

Heat Recovery Ventilation Winter Problems: Frost Protection, Preheaters and Filters (Rotary vs Plate)

Indoor Humidity in Winter: Why It Drops to 20–30 RH and How to Control It (Heat Exchanger Comparison + Practical Solutions)

Why Your Heat Recovery Ventilation (HRV) Can Freeze in Winter — and How Frost Protection Works

JOULE Filters

InvaVent 350 F7+M5 Filter set (Efficient)

InvaVent 350 G4+G4 Filter set (Economy)

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