The Vectaire Cool Breeze Plus is supplied as a complete system with the Vectaire Maxi Plus BY MVHR unit — combining whole-house mechanical ventilation with heat recovery and comfort cooling for overheating mitigation for larger residential properties. The Maxi Plus BY provides continuous fresh filtered air with up to 89% heat recovery efficiency and a peak airflow of 238 l/s, while the Cool Breeze Plus cools the incoming supply air by up to 20°C — delivering up to 4.3 kW of total cooling capacity without any external condenser unit.
The system uses R290, a natural refrigerant with a Global Warming Potential of just 3 — over 225 times more environmentally friendly than R32 — achieving an outstanding COP of up to 6.5 and EER of up to 4.6. Together, the Cool Breeze Plus and Maxi Plus BY meet the overheating assessment standards of CIBSE TM59 and Approved Document O of the UK Building Regulations, providing developers, architects, and self-builders with a fully compliant, high-efficiency, no-external-condenser solution for year-round indoor climate control.
Comfort Cooling, Not Air Conditioning
The Cool Breeze Plus provides comfort cooling, not air conditioning in the conventional sense — it takes the edge off summer overheating by cooling the fresh air already being delivered through the MVHR ductwork, rather than operating as a dedicated split air conditioning system. It is designed to keep homes comfortable during warm weather, not to replace a purpose-built cooling system in spaces with high heat loads.
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4.3 kW
Max Cooling Capacity
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89%
Maxi Plus BY Heat Recovery
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20°C
Max Supply Air Drop
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COP 6.5
Coefficient of Performance
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GWP 3
R290 Natural Refrigerant
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No Condenser
External Unit Required
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Important Safety Information — F-Gas Refrigerant
The Cool Breeze Plus uses R290 (propane) — a flammable refrigerant classified A3. Installation of the refrigerant circuit must be carried out by a suitably qualified F-Gas or equivalent refrigerant engineer in accordance with relevant safety regulations. The system is sealed for life and must not be modified or recharged. Ensure adequate ventilation in the installation location. The Maxi Plus BY must be installed and commissioned in accordance with Building Regulations Part F. Allow 200 mm clearance each side of the Maxi Plus BY cabinet for motor access. The combined system weighs up to 103 kg — ensure adequate structural support in the plant room or loft.
Supplied Together — Maxi Plus BY MVHR + Cool Breeze Plus
This listing covers the complete Cool Breeze Plus system as supplied with the Vectaire Maxi Plus BY MVHR. The Cool Breeze Plus cooling module is engineered exclusively for the Maxi Plus BY and is not compatible with any other MVHR unit. Wall bracket or floor stand required for the cooling module — available separately. Confirm handing and installation configuration before ordering. Humidistat variants of the Maxi Plus BY have factory-set handing — confirm left or right drain direction at point of order.
Certifications — Passive House Certified Option Available
The Maxi Plus BY is SAP PCDB Listed and CE marked, manufactured in the UK to ISO 9001:2015 and ISO 14001:2015. A Passive House Certified variant of the Maxi Plus BY is available for Passivhaus projects. The Cool Breeze Plus is a Vectaire Registered Design.
R290 — Outstanding GWP & Efficiency
The Cool Breeze Plus uses R290 (propane) with a GWP of just 3 — over 225 times more environmentally friendly than R32. This natural refrigerant delivers exceptional thermodynamic performance, enabling a COP of up to 6.5 and EER of up to 4.6. This means lower electricity bills for occupants and a dramatically reduced refrigerant climate impact over the product's lifetime.
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4.3 kW Cooling — No External Condenser
The sealed-for-life system delivers up to 4.3 kW of total cooling at 815 W of electrical consumption. The internal condenser rejects heat through the Maxi Plus BY's exhaust airstream — no external condenser unit is required. This eliminates planning constraints, external fan noise, and the visual impact of conventional AC equipment on new-build facades or existing properties.
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Cools Supply Air by Up to 20°C
The Cool Breeze Plus removes heat from the Maxi Plus BY's fresh supply airstream before it is distributed throughout the home. At 30°C external / 23°C internal and 110 l/s airflow, the supply air temperature reaches 14.8°C with a total cooling power of 2.56 kW at 50% relative humidity. At 35°C external and 110 l/s, cooling output reaches 3.19 kW — providing substantial comfort cooling through the existing ductwork.
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High Capacity — Up to 160 l/s Airflow
The Cool Breeze Plus is engineered for the higher airflows of the Maxi Plus BY, handling up to 160 l/s — significantly more than the standard Cool Breeze (140 l/s). This larger airflow envelope ensures the cooling module keeps pace with the Maxi Plus BY's capacity, maintaining consistent comfort even in the largest open-plan spaces.
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Automatic Integral Sensor Control
The Cool Breeze Plus automatically senses both room temperature and the incoming fresh air temperature via an integral sensor, activating cooling only when conditions require it. This prevents false triggering and optimises energy consumption. An optional manual override allows occupants to control cooling to their own preference. Universal handing via intelligent software means no mechanical adjustment is required on site.
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Very Quiet — Front Service Access
The very quiet integral condenser rejects heat through the Maxi Plus BY's exhaust duct rather than via an external fan. At 100% (180 l/s) breakout sound pressure is 43.3 dBA at 3 m; at 60% (100 l/s) this falls to 34.2 dBA. All servicing is via front access panels — no additional side or rear clearance is needed beyond the Maxi Plus BY's standard 200 mm motor clearance requirement.
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Wall or Floor Installation
The Cool Breeze Plus + Maxi Plus BY can be installed in wall-mounted or floor-standing configurations using the appropriate wall bracket or floor stand (available separately). The combined unit is 818 mm wide and 1599 mm tall in the wall bracket arrangement (1405 mm on a floor stand) — suitable for plant rooms, utility spaces, or loft installations with adequate head height and structural support for the combined 103 kg weight.
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Fresh Air — Not Recirculated, Not Air Conditioning
Unlike a conventional split-system air conditioner, the Cool Breeze Plus cools fresh outdoor air as it enters the home through the Maxi Plus BY MVHR — it never recirculates stale indoor air, and it is not a like-for-like replacement for split air conditioning. Occupants receive continuous cooled, filtered fresh air distributed throughout the property, preserving the full indoor air quality benefits of MVHR alongside comfort cooling.
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Vectaire Maxi Plus BY MVHR — Supplied with the Cool Breeze Plus
Up to 89% Counter-Flow Heat Recovery
The Maxi Plus BY's counter-flow heat exchanger achieves up to 89% thermal efficiency under SAP 10 conditions, recovering warmth from stale exhaust air without mixing the two airstreams. Even at the most demanding configuration (kitchen plus seven wet rooms), heat exchange efficiency remains at 84% — maintaining strong performance across large-home layouts.
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238 l/s — Largest Capacity in the Vectaire Range
The Maxi Plus BY reaches a peak airflow of 238 l/s (857 m³/hr) at 100% speed — the highest capacity in the Vectaire residential MVHR range, making it the correct choice for large detached homes, open-plan new builds, and high-specification retrofit projects. SFP is as low as 0.46 W/l/s, comfortably meeting Part L energy targets.
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Automatic Summer Bypass & Frost-Stat
The Maxi Plus BY includes a fully automatic summer bypass and an integral frost-stat as standard. The bypass routes incoming air around the heat exchanger automatically during mild weather; the frost-stat proportionally reduces intake fan speed as outside temperatures fall between +3°C and −8°C — protecting the heat exchanger through UK winters without a separate controller.
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EC Motors, Smart Controls & BMS Integration
High-quality EC brushless motors power five speed steps from 35 l/s to 238 l/s, drawing just 8 W at 20% and 355 W at 100%. Factory-set options include 0-10V connections for BMS, CO₂ detection, and home automation; integral humidistat; holiday mode; relay for external pre-heater; and run-time counters downloadable via QR code.
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Technical Specifications
| Cool Breeze Plus Cooling Module |
| Max Total Cooling Capacity |
4.3 kW |
| Power Consumption |
815 W |
| Full Load Current (FLC) |
5.5 A |
| COP (max) |
6.5 |
| EER (max) |
4.6 |
| Refrigerant |
R290 (propane) — natural refrigerant, GWP 3 |
| Max Supply Air Temperature Reduction |
Up to 20°C |
| Max Airflow (cooling module) |
160 l/s |
| Breakout Sound Pressure @ 3m |
43.3 dBA @ 100% (180 l/s) · 34.2 dBA @ 60% (100 l/s) |
| Cooling Unit Weight |
66 kg |
| Installation Options |
Wall mounted or floor standing (bracket/stand sold separately) |
| Handing |
Universal via intelligent software |
| Servicing Access |
Front access |
| Vectaire Maxi Plus BY MVHR (Supplied With) |
| Max Airflow Capacity |
238 l/s (857 m³/hr) |
| Airflow at 50Pa |
230 l/s |
| Heat Exchange Efficiency (max) |
89% (SAP 10: Kitchen + 1 wet room) |
| Specific Fan Power (SFP) |
Down to 0.46 W/l/s |
| Total Power — 100% / 20% |
355 W / 8 W |
| Operating Current |
2.81 A |
| Airflow Speeds (l/s) |
238 / 186 / 135 / 84 / 35 (100%–20%) |
| Breakout Sound Pressure @ 3m |
43.1 dBA @ 100% · 20.4 dBA @ 20% |
| Frost-Stat Activation Range |
+3°C to −8°C (outside temperature) |
| Filter Grade |
G3 disposable, easily accessible |
| Maxi Plus BY Weight |
37 kg (Maxi Plus BY) · 42 kg (Maxi Plus-AT) |
| Duct Connection Diameter |
Ø149 mm |
| Combined Height — Wall Bracket |
1599 mm |
| Combined Height — Floor Stand |
1405 mm |
| Combined Width |
818 mm (front) · 823 mm (rear) |
| Combined System Weight |
103 kg (Cool Breeze Plus 66 kg + Maxi Plus BY 37 kg) |
| Warranty (Maxi Plus BY) |
5 years (1 year parts & labour, 4 years parts only) |
| Certifications |
SAP PCDB Listed · CE Marked · ISO 9001:2015 · ISO 14001:2015 · EU RoHS |
| System Compliance |
CIBSE TM59 · Approved Document O · Building Regulations Part F & Part L |
| Sound Testing Standard |
BS EN ISO 3743-1:2010 (independently tested) |
| Manufacturer |
Vectaire Ltd, High Wycombe, UK |
Frequently Asked Questions
What does this listing include — is the Maxi Plus BY MVHR supplied with the Cool Breeze Plus?
Yes. The Cool Breeze Plus is supplied as a complete system with the Vectaire Maxi Plus BY MVHR. The two units are engineered exclusively to work together: the Maxi Plus BY handles year-round fresh air ventilation and heat recovery, and the Cool Breeze Plus cools the incoming supply air during warmer months. The Cool Breeze Plus is not compatible with any other MVHR unit.
Is this the same as air conditioning?
No. The Cool Breeze Plus provides comfort cooling — it is not a split air conditioning system. Rather than recirculating and cooling indoor air through a dedicated AC unit, it cools the fresh outdoor air already being supplied by the Maxi Plus BY MVHR before distributing it through the home's existing ductwork. It has no external condenser, produces no external fan noise, and is designed to take the edge off summer overheating rather than provide the rapid, deep cooling of a conventional air conditioning system.
Does this system satisfy Approved Document O?
Yes. The Cool Breeze Plus + Maxi Plus BY meets the standards used in CIBSE TM59 overheating assessments and Approved Document O of the UK Building Regulations. It provides architects, developers, and self-builders with a fully documented, compliant overheating mitigation route for larger new residential buildings subject to Part O requirements. Contact Casavent for full overheating assessment documentation support.
Can this system be used in a Passivhaus project?
A Passive House Certified variant of the Maxi Plus BY is available, making the complete system eligible for use in Passivhaus certified dwellings where the Passivhaus Institut's strict heat recovery and airtightness requirements must be demonstrated. Contact Casavent for Passivhaus-specific system design, documentation, and certification support for your project.
How does a COP of 6.5 compare to conventional air conditioning?
A COP of 6.5 means the Cool Breeze Plus delivers 6.5 units of cooling energy for every 1 unit of electricity consumed — significantly more efficient than most domestic split-system air conditioners, which typically achieve COPs of 3–4. This is partly attributable to R290's excellent thermodynamic properties and partly to the system's unique operating condition of using the MVHR exhaust airstream for heat rejection rather than ambient outdoor air.
What support does Casavent provide for Cool Breeze Plus projects?
Casavent provides full end-to-end design support for Cool Breeze Plus + Maxi Plus BY projects, including overheating assessment guidance, full system specification and design, CAD drawings, airflow and pressure calculations, and complete component breakdowns. As members of the Young's Extract Supplies Group and specialists in residential ventilation, Casavent supports self-builders, contractors, architects, and developers from initial specification through to commissioning.
