System 1 - Intermittent Extract Fans - EnviroVent
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Intermittent Extract Fans

System 1 - Background Ventilation and Intermittent Extract Fans

System 1

The most common approach to meeting the Building Regulations Part F is intermittent extract fans with background vents (i.e. trickle vents in the windows). Extract fans are located in the bathroom, ensuite, kitchen and utility room. They must comply with providing the following ventilation airflow rates for minimum intermittent extract and whole building ventilation rate based on number of bedrooms and occupancy levels in the dwelling:

Table 5.1a - Extract Ventilation Rates

Table 5.1b - Whole Building Ventilation Rates

In addition, background ventilators must comply with the total ventilator area (mm2) depending upon the design air permeability:

Background Ventilation - ABackground Ventilation - B

Intermittent extract fans can be operated with a number of different control functions: fan operates in conjunction with a light switch, remote switch, pull cord, humidistat, PIR (presence detector) or timer. Intermittent fans are not the most energy efficient way due to the heat loss incurred.

In addition, if they are not switched on, the property is not being adequately ventilated. The fans must be regularly maintained in order to work effectively and minimise sound levels.

System 1 - Ventilation Solutions:

 

Silent 100Silent 100

Range of 100mm domestic axial extract fans for wall or ceiling installations, designed to solve ventilation problems in utility rooms and bathrooms. Fitted with motors mounted on silent elastic blocks, the fans deliver incredibly silent running and exceptional performance with stylish features.


Silent 100 DesignSilent 100 Design

Range of 100mm domestic axial extract fans for wall or ceiling installations, designed to solve ventilation problems in utility rooms and bathrooms. Fitted with motors mounted on silent elastic blocks, the fans deliver incredibly silent running and exceptional performance with stylish features.


Profile 100Profile 100

Easy to install, aesthetically pleasing and unobtrusive, the range compliments any contemporary building design. With sealed for life ball bearing motors and a low power consumption of only 13 Watts, the range offers a variety of features to include optional timer, pullcord, humidity sensor and PIR models.


CLASSIC 100CLASSIC 100

Offering a variety of optional features to include adjustable timers, humidity sensors, pullcord and thermo-electric shutters. With airflow rates of approximately 28 l/s, the CLASSIC 100 meets and exceeds the requirements of the Building Regulations.


POWER 170POWER 170

The POWER range of 100mm centrifugal fans are suitable for many general domestic applications where higher system resistances are encountered. Available with a variety of fan function options and suitable for wall or ceiling applications.


ENV 100ENV 100

With automatic backdraught shutters fitted as standard, this prevents air entry and limits heat leakage when the extract fan is not operating. Supplied with double electrical insulation, all models are IPX4 rated.

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