National Ventilation Monsoon MON-DMEVR100HT 100mm Continuous Running Extractor Fan with Humidistat – IPX5

The National Ventilation Monsoon MON-DMEVR100HT is a quiet, energy-efficient 100mm continuous running extractor fan with an integrated humidistat, designed to provide reliable background ventilation in bathrooms, kitchens, utility rooms and other domestic spaces.

Part of the Monsoon dMEV R range, this decentralised mechanical extract ventilation fan uses a high-pressure, low-noise impeller to deliver effective air extraction while maintaining quiet operation, with manufacturer-stated noise levels as low as 11dB(A).

Unlike conventional intermittent extractor fans, the Monsoon dMEV R operates continuously to help remove moisture, stale air and indoor pollutants. Its built-in humidistat automatically responds to rising humidity, increasing ventilation when additional moisture extraction is required.

Designed to support compliance with the applicable requirements of UK Building Regulations Part F and Part L, the MON-DMEVR100HT is suitable for domestic ventilation installations where continuous mechanical extraction is specified.

With an IPX5 water-resistance rating, the fan is suitable for installation in bathroom Zones 1, 2 and 3, subject to correct installation and the manufacturer's instructions.

Its compact 100mm (4-inch) connection, discreet round white fascia and wall or ceiling mounting capability make it an excellent choice for new-build properties, bathroom refurbishments and ventilation upgrades.

Whether installed in an en-suite bathroom, kitchen or utility room, the Monsoon MON-DMEVR100HT provides continuous, humidity-responsive ventilation with minimal disruption.

Key Features

• 100mm (4-inch) continuous running extractor fan

• Integrated humidistat – automatically responds to increased humidity

• Monsoon dMEV R technology – continuous decentralised mechanical extract ventilation

• Quiet operation – manufacturer-stated noise levels as low as 11dB(A)

• High-pressure impeller – designed for effective air extraction

• IPX5 water-resistance rating

• Suitable for bathroom Zones 1, 2 and 3, subject to correct installation

• Continuous background ventilation – helps manage condensation and stale air

• Humidity-responsive boost operation – increases extraction when needed

• Designed to support Building Regulations Part F and Part L compliance

• 100mm duct connection – compatible with suitable 4-inch ducting

• Wall or ceiling mounting

• Round white fascia – discreet appearance

• Suitable for kitchens, utility rooms and bathrooms

• Ideal for new-build and refurbishment projects

Continuous Mechanical Extract Ventilation

The Monsoon MON-DMEVR100HT is designed to operate continuously, providing a consistent background level of ventilation.

This helps remove moisture and stale air throughout the day rather than relying solely on short periods of extraction.

Continuous mechanical ventilation can be particularly beneficial in modern, well-insulated properties where natural air movement may be limited.

The fan can operate at a higher extraction rate when additional ventilation is required, helping to maintain suitable indoor air quality.

Automatic Humidity Control

The MON-DMEVR100HT features an integrated humidistat that monitors moisture levels and responds automatically when humidity rises.

This is especially useful in bathrooms and shower rooms, where steam and condensation can build up rapidly.

Humidity-responsive extraction helps remove excess moisture without requiring occupants to manually switch the fan on every time the room is used.

Quiet Running – As Low As 11dB(A)

The Monsoon dMEV R range is designed for low-noise operation, with manufacturer-stated sound levels as low as 11dB(A).

Its high-pressure impeller is designed to provide effective ventilation while minimising operating noise.

This makes the fan particularly suitable for en-suite bathrooms, family bathrooms and other areas where quiet continuous ventilation is desirable.

Actual noise levels depend on the selected operating setting, ductwork and installation conditions.

IPX5 Rated for Bathroom Installation

The Monsoon MON-DMEVR100HT features an IPX5 rating, providing protection against water jets.

The manufacturer specifies the dMEV R range as suitable for bathroom Zones 1, 2 and 3 when correctly installed.

This makes the fan suitable for a wide range of domestic bathroom ventilation projects, including installations where a higher level of water protection is required.

Designed for UK Building Regulations

The Monsoon dMEV R range is designed to support the ventilation and energy-efficiency requirements of Building Regulations Part F and Part L.

Its continuous extraction operation makes it suitable for domestic ventilation designs that specify decentralised mechanical extract ventilation.

Final compliance depends on correct fan selection, airflow commissioning, ductwork design and the overall ventilation installation.

Suitable Applications

• Bathrooms

• Shower rooms

• En-suite bathrooms

• Kitchens

• Utility rooms

• Toilets and cloakrooms

• New-build residential properties

• Bathroom refurbishments

• Domestic ventilation upgrades

• Continuous mechanical extract ventilation systems

Bathroom zone suitability is subject to the manufacturer's instructions and applicable electrical regulations.

Frequently Asked Questions

What is the National Ventilation MON-DMEVR100HT?

The MON-DMEVR100HT is a 100mm continuous running extractor fan with an integrated humidistat, designed for domestic bathrooms, kitchens and utility rooms.

Does the MON-DMEVR100HT run continuously?

Yes. The fan is designed to operate continuously at a background extraction rate, increasing ventilation when additional extraction is required.

Does the fan have a built-in humidistat?

Yes. The integrated humidistat responds automatically to rising humidity levels.

How quiet is the Monsoon dMEV R?

The manufacturer describes the range as operating at noise levels as low as 11dB(A). Actual noise depends on operating speed and installation conditions.

Is the MON-DMEVR100HT suitable for bathroom Zone 1?

Yes. The fan is IPX5 rated, and the manufacturer specifies suitability for Zones 1, 2 and 3, subject to correct installation.

Can it be installed in a kitchen?

Yes. The Monsoon dMEV R range is designed for domestic kitchens, utility rooms and bathrooms. The selected model must be commissioned to provide the airflow required for the installation.

Can the fan be ceiling mounted?

Yes. The fan is suitable for wall or ceiling mounting in accordance with the manufacturer's installation instructions.

What size ducting does it require?

The MON-DMEVR100HT has a nominal 100mm (4-inch) duct connection.

Does the fan comply with Building Regulations?

Is this a standard intermittent bathroom fan?

No. It is a continuous running dMEV extractor fan, designed to provide ongoing background ventilation.

Installation Information

The National Ventilation Monsoon MON-DMEVR100HT should be installed by a suitably competent person in accordance with the manufacturer's instructions and applicable electrical regulations.

Appropriate ductwork, electrical isolation and airflow commissioning are essential for correct operation.

Where installed in a bathroom, the fan's IPX5 rating and the requirements of the relevant electrical zone must be considered as part of the complete installation.