CALM 24/7 Intelligent dMEV Fan with Mould Risk Sensor & Data Logging
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SKU
CALM-24-7
CALM 24/7 - Intelligent dMEV Ventilation
Ventilation | Mould Risk | Data Logging | Control
- ✓ Continuous low-energy ventilation with automatic boost.
- ✓ Four-level Mould Risk Sensor™ protection.
- ✓ Secure downloadable environmental and operating history.
- ✓ PIN-protected setup and commissioning.
- ✓ Supports Part F, Part L and proactive damp and mould management.
CALM 24/7 Intelligent dMEV Extractor Fan
Social Housing|New Builds|Retrofit
CALM 24/7 combines continuous low-energy extraction with sustained mould-risk response, protected setup and a controlled local operating record—giving property teams clearer evidence without relying on tenant Wi-Fi or an ongoing subscription.
LCD status display
Live temperature, relative humidity, active mode and basic diagnostic information.
Mould Risk Sensor™
Four installer-selectable response profiles for different property conditions.
No subscription
Controlled local data retrieval without relying on tenant Wi-Fi or third-party monitoring.
Installer controlled
Quick setup, commissioning records and protected engineering access.
Explore what CALM 24/7 can do
Six focused features make setup simpler, ventilation more responsive and property performance easier to understand. Select a card to discover the benefit in more detail.
Made to sit quietly in the room
Four outcomes from one intelligent dMEV platform
Ventilation continuity
Maintain the baseline
Continuous trickle + demand response
Designed to keep background extraction active between moisture events, with higher airflow when configured triggers call for it.
Risk visibility
Recognise sustained conditions
RH + temperature + time
Distinguishes longer-running risk patterns from a short-lived humidity rise, helping teams focus attention where it may be needed.
Setup integrity
Protect commissioned settings
PIN-controlled engineering access
Separates everyday operation from engineering controls, helping the agreed setup remain available for review after handover.
Operating evidence
Review the sequence of events
Local environmental + fan history
Shows conditions, responses, faults and interruptions in sequence, giving inspections and maintenance visits better context.
A single visit rarely tells the whole story
Humidity may have risen hours earlier, the room may have cooled overnight, the fan may have boosted correctly or an interruption may have occurred. By the time an inspection begins, the immediate conditions may look normal.
How the history supports a visit
Between visits
Environmental conditions and fan operation continue to change.
At inspection
Authorised teams can review the local history rather than relying only on the conditions present that day.
Next action
The additional context can support targeted investigation, maintenance and resident communication.
Designed around real stakeholders
For residents
Automatic background ventilation without an app or tenant Wi-Fi to maintain.
For landlords and housing associations
Property-specific history to help prioritise inspection, repair and maintenance decisions.
For installers and maintenance teams
Repeatable setup, measured airflow and clearer diagnostic support at handover and service.
For compliance teams
Supporting records for design, commissioning and review—without treating monitoring as proof of compliance.
Designed to support compliant ventilation and better-informed housing response
For projects in England, CALM 24/7 can support a compliant dMEV strategy, but compliance remains project-specific. It depends on the edition in force, correct product selection, design, installation, airflow testing and documented commissioning.
Building Regulations
Approved Document F
Ventilation rates, testing and commissioning
Designed to support decentralised continuous mechanical extract ventilation, with adjustable trickle and boost airflow for bathrooms, kitchens and other wet rooms.
The 2021 edition currently applies to most work. The 2026 edition is scheduled to take effect from 24 March 2027, with separate dates and transitional arrangements for relevant higher-risk building work. Confirm the applicable route before specification.
Building Regulations
Approved Document L
Future dMEV benchmark: ≤0.3 W/(l·s)
The 2026 edition lists a maximum Specific Fan Power of 0.3 W/(l·s) for continuous decentralised mechanical extract ventilation and is scheduled to take effect from 24 March 2027 for most work in England.
Confirm the applicable edition and transitional route, then verify installed airflow and electrical power against approved product data.
Social housing in England
Awaab’s Law
Monitoring that supports earlier investigation
Government guidance recognises that environmental monitoring can help landlords identify early signs of damp and mould and investigate reported hazards promptly.
CALM 24/7 records environmental conditions and fan operation, giving authorised housing teams additional context to support timely inspections, repairs and resident communication.
24 hours
Investigate a potential emergency hazard and, if confirmed, complete relevant safety work within 24 hours of awareness.
10 working days
Complete the investigation of a potential significant hazard after becoming aware of it.
3 working days
Provide the resident with the required written summary within 3 working days after the investigation concludes.
5 working days
After an investigation confirms a significant hazard, complete relevant safety work and begin, or take steps to begin, supplementary preventative work.
Mould-risk response profiles
Low Risk
- Trigger
- 65% RHfor 24 hours
- Response
- 30-minute boostevery 4 hours
Medium Risk
- Trigger
- 70% RHfor 12 hours
- Response
- 60-minute boostevery 2 hours
High Risk
- Trigger
- 75% RHfor 6 hours
- Response
- Continuous boostuntil RH falls below 65%
Extreme Risk
- Trigger
- 85% RHfor 1 hour
- Response
- Continuous boostpersistent-risk event recorded
Clear on the fan. Detailed when downloaded.
The LCD gives authorised installers and service engineers immediate access to live conditions and operating status. The wider data record can provide longer-term context for understanding patterns, investigating complaints and reviewing settings.
- Live room temperature
- Live relative humidity
- Current trickle or boost mode
- Basic fault and diagnostic codes
- Protected menu access
- Guided commissioning workflow
A clearer history of the property and the fan
Authorised teams can retrieve a controlled local record without depending on tenant Wi-Fi or an ongoing monitoring subscription.
Environmental conditions
Temperature, relative humidity and sustained mould-risk periods.
Ventilation operation
Background and boost activity, including when and why the fan responded.
Faults and interruptions
Diagnostic events, loss of power and relevant operating interruptions.
Protected setting changes
A setting-change record that can support maintenance review and controlled recommissioning.
Set it correctly. Record it. Keep it protected.
CALM 24/7 is designed to make correct setup clearer for installers and help restrict casual changes after handover. Trickle and boost airflows are adjusted on site, measured at the terminal and recorded alongside power and SFP where required.
- Quick setup for common installations
- Adjustable trickle and boost speeds
- Humidity trigger and run-on control
- PIN-protected commissioning menu
- Airflow and SFP recording
- Service and fault-finding support
CALM 24/7 compared with conventional extract
Basic response
Intermittent extractor fan
Ventilation when manually or automatically activated.
- Suited to straightforward intermittent extract applications.
- Normally stops between demand periods.
- Limited long-term environmental context.
- Performance depends heavily on activation and use.
Enhanced control and insight
CALM 24/7
Continuous ventilation, environmental insight and protected control.
- Continuous trickle with automatic high-rate response.
- Integrated Mould Risk Sensor™ with four profiles.
- LCD status, fault information and data logging.
- PIN-protected commissioning and controlled retrieval.
Continuous option
Conventional dMEV fan
Continuous background extraction with demand boost.
- Supports continuous ventilation strategies.
- Humidity or switched boost may be available.
- Setup controls vary by product.
- Environmental and operating history may be limited.
More than extraction. A clearer basis for action.
Frequently Asked Questions
1. What is a dMEV fan?
A decentralised mechanical extract ventilation fan runs continuously at a low background rate and increases to a higher rate when additional extraction is required. Individual fans are normally installed in wet rooms such as kitchens, bathrooms, utility rooms and toilets.
2. How does it support Approved Document L?
Approved Document L 2026 lists a maximum SFP of 0.3 W/(l·s) for continuous decentralised mechanical extract ventilation. Confirm the regulatory edition applying to the project and measure installed airflow and electrical power so actual SFP can be calculated and checked against the design.
3. What does the Mould Risk Sensor™ monitor?
It evaluates relative humidity, temperature and how long elevated-risk conditions persist. This allows the fan to respond to sustained patterns rather than treating every short humidity rise as the same level of risk.
4. Does data logging need Wi-Fi or a subscription?
No. The design uses controlled local retrieval, avoiding dependence on tenant Wi-Fi and ongoing third-party monitoring subscriptions. Confirm the retrieval method, export format, logging interval and storage capacity in the current version-specific data-logging guide before specification.
5. Is the data proof that a resident caused damp or mould?
No. Data provides useful context but should be interpreted alongside an inspection, the condition of the building, heating and insulation, occupancy needs and other possible moisture sources. It should support diagnosis, not replace it.
6. Does CALM 24/7 comply with Approved Document F?
It is designed to support a compliant decentralised continuous extract installation. Compliance depends on the ventilation design, correct installation, measured airflow, commissioning and the requirements applying to the individual dwelling.
7. Does CALM 24/7 make a property compliant with Awaab’s Law?
No product can make a property compliant on its own. In social housing in England, environmental and operating data can support earlier investigation and better-informed action, but landlords must still assess reported hazards, communicate with residents and complete the required safety and supplementary preventative work within the applicable timeframes.
8. Can residents change the protected settings?
Commissioning and engineering settings are PIN protected so access can be restricted to authorised installers, service engineers and housing teams.
9. What can be seen on the LCD?
The display can show live temperature, live relative humidity, the current fan mode and basic fault information. Protected menus are used for setup, commissioning and service access.
10. Who is CALM 24/7 designed for?
It is particularly suited to social landlords, local authorities, housing associations, private landlords, retrofit programmes and homes where condensation, damp or mould risk requires more controlled ventilation and better operating insight.
| EAN Number | 5056194057562 |
|---|---|
| Impeller Type | Mixed Flow |
| Connection | Wired connection |
| Motor Type | EC |
| Size | 100mm |
| Colour | White |
| Duct Connection Size | 100mm Dia |
| Delivery Lead Time | Normal |