Holtop Eco-Smart XHBQ-D3.5 (350 m3/h) G4+G4 Filter set (Standard)
£14.02
Ex VAT: £11.68
Reference: HOLERV35G4 In stock
| Filter dimensions | 670x180 |
| Class EN779 | G4+G4 |
| Class ISO16890 | Coarse 65% |
| Protection level | Basic: larger solid particles, dust, fluff. |
| Quantity of filters | 2 |
| Advantages | |
| check Foldable filter frame allows to install filter in tight places. | check G4 filter captures 20% more dust and much smaller particles than analog G3 filters. |
| check German filtration material – hygienic (VDI 6022) and PFAS-free, for cleaner and safer air | check ISO 16890 tested – performance verified by an accredited laboratory in Germany |
| check Lower running costs – lower filter price, lower energy use, and usually longer time between replacements than higher-efficiency filters. | check Made in the EU – reliable quality and strict safety standards |
HOLERV35G4
Data sheet
- Manufacturer of MVHR
- Holtop
- Manufacturer
- CleanFilter
- Model
- Eco-Smart XHBQ
- Model size
- 3.5
- Air handling unit
- Eco-Smart XHBQ-D3.5
- Filter dimensions
- 670x180
- Class EN779
- G4+G4
- Class ISO16890
- Coarse 65%
- Protection level
- Basic: larger solid particles, dust, fluff.
- Quantity of filters
- 2
- Advantages
- Foldable filter frame allows to install filter in tight places.
G4 filter captures 20% more dust and much smaller particles than analog G3 filters.
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
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 - Google category ID
- 3573
- Product type
- Filters for Air Handling Units
✅ Filter Maintenance Recommendations
⏳ When to Replace Filters?
- Filter contamination is monitored by a timer in the control unit. Replacement alerts appear on the display or in the mobile app.
- ⚠️ A filter alert is just a reminder — your AHU will continue operating normally.
- The replacement frequency depends on outdoor air quality. If you live near busy roads, gravel paths, construction sites, industrial zones, or farmland, you may need to replace filters 1.5–2× more often.
- Most manufacturers recommend replacing filters at least twice a year: before and after the heating season.
⚙️ Recommended Filter Replacement Intervals:
| Filter Type | Suggested Replacement |
|---|---|
| Activated carbon (F7-AC) | every 3 months |
| F7–F9 | every 4–6 months |
| M5 / G4 | every 5–8 months |
Using a G4 prefilter can extend F7–F9 filter lifespan by 2–3 months.
Return air filters (extract side) may be replaced less frequently than supply air filters (F7, F7/AC).
♻️ Reusable Filter Types
- Wire-frame filters and filter media pads (cut-to-size materials) can be vacuumed every 2–3 months, up to 2–3 times before replacement — if permitted in your unit's manual.
- However, panel and pocket filters are strictly single-use. Vacuuming or washing them may damage the filter and reduce efficiency. Fine dust gets trapped in the inner layers and cannot be removed.
⚙️ Step-by-Step Filter Replacement
- Check your user manual if replacing filters for the first time.
- Turn off the AHU and wait until all fans stop rotating.
- Remove the front panel or filter cover.
- Take out the old filters.
- Vacuum inside the unit if possible and wipe down filter holders with a damp cloth.
- Inspect and clean other AHU components if needed — such as rotor belt, heat exchanger, fan blades, etc.
- Install new filters carefully:
- Check airflow direction — arrows on the filters must match the AHU’s airflow.
- Typically, filters are installed before the heat exchanger; arrows should point inward toward the center.
- If there are 3 filters and the F7/F8 filter is on the opposite side of the exchanger from G4, its arrow must point away from the exchanger.
- Incorrect orientation can increase airflow resistance by up to 15%.
- If using different filter types (e.g. F7 and G4), install F7 on the outdoor air side and G4 on the extract side. The outdoor air duct is usually insulated; the extract duct is not. Refer to the manual and note whether your unit is left- or right-handed.
- After installation, close the cover and restart the unit.
- Reset the filter timer using the control device, according to the user manual.
❌ Do Not Use the Unit Without Filters
Running your ventilation unit without filters will clog the heat exchanger and contaminate the entire system. It will also void your warranty.
⏳ Why Timely Filter Replacement Matters
Dirty filters increase airflow resistance, reduce airflow, raise energy consumption, and increase operating noise. Replacing them on time ensures efficiency and extends system life.
Watch the instructional video on general filter replacement: 
✅ Why choose us?
| ⚙️ Advantage | ⚙️ Description |
|---|---|
| ✅ Experience & support | Our consultants have extensive experience in HVAC manufacturing and service. |
| ✅ Wide selection | We offer a variety of filter types – including activated carbon and energy-efficient options – for most AHUs. |
| ✅ Fast delivery | With 40,000+ filters in stock, we ship on the same or next business day. |
| ✅ Premium materials | Filtering media from SANDLER AG (Germany) offers high dust-holding capacity and performance. |
| ✅ Sealed for quality | All filters, including G4 class, are tightly sealed to prevent air leaks. |
| ✅ Competitive prices | Thanks to our direct factory supply and large volumes, we offer some of the best filter prices in the EU. |
| ⚙️ EU-made | Most filters sold in Europe are made in China using low-grade materials. Ours are produced in the EU. |
| ⏳ Certified performance | Efficiency tested according to ISO 16890 in an accredited German laboratory. |
⚠️ PFAS chemicals have been used in a wide range of products since the 1940s. During production or use, PFAS can migrate into soil, water, and air. Most of these chemicals are practically non-degradable. Numerous scientific studies indicate that PFAS chemicals may pose risks to human and animal health.
♻️ Major Health Risks:
| ✔️ Risk | ✨ Description |
|---|---|
| ✅ Heart Disease | PFAS may increase the risk of heart-related illnesses. |
| ✅ Reproductive Disorders | Can affect hormone systems, causing infertility and other reproductive issues. |
| ✅ Neurological Effects | Linked to brain development disorders and cognitive impairments in children. |
| ✅ Increased Cancer Risk | Evidence suggests PFAS may raise the risk of certain cancers. |
♻️ Main Products Containing PFAS:
♻️ CleanFilter Solution
- ✔️ Healthier indoor air. PFAS chemicals do not enter the air or spread throughout your rooms.
- ✔️ Complies with the latest standards. Our filters meet current safety requirements and forthcoming regulations regarding PFAS materials.
- ✔️ Excellent performance. The synthetic filtering material offers durability and high efficiency without harmful additives.
- ✔️ Environmental protection. Choosing PFAS-free filters helps reduce pollution and protect public health.
| Manufacturer of MVHR | Holtop |
| Manufacturer | CleanFilter |
| Air handling unit | Eco-Smart XHBQ-D3.5 |
| Filter dimensions | 670x180 |
| Class EN779 | G4+G4 |
| Class ISO16890 | Coarse 65% |
| Protection level | Basic: larger solid particles, dust, fluff. |
| Quantity of filters | 2 |
| Advantages |
|