Specification Clause
Dwellings: Continuous Mechanical Ventilation (Passivent iMEV)
Passivent iMEV ventilation system
Provide a Passivent ventilation system complying with
Building Regulations (England and Wales) Approved Document F
OR
Building (Scotland) Regulations Technical Handbook Domestic Section 3
OR
Building Regulations (Northern Ireland) Technical Booklet K
OR
Building Regulations (Republic of Ireland) Technical Guidance Documents Part F
by means of a whole house intelligent mechanical extract ventilation (iMEV) system comprising:
Inlets
Either manual or humidity controlled wall / window inlet vents. All vents to be sited in habitable
rooms as follows:
TVES4 / A101 ~ Energy Saver Window Vent - Automatic Humidity Sensitive Window Inlet
operating between 47 - 65% Relative Humidity and external Canopy Grille, allowing 2,760mm2
equivalent area in the fully open position. One vent to be located in each habitable room.
TVES4dB / A101dB ~ Acoustic Energy Saver Window Vent - Automatic Humidity Sensitive
Window Inlet operating between 47 - 65% Relative Humidity and external Canopy Grille, allowing
2,760mm2 equivalent area in the fully open position, and offering up to 39dB Dn,e,w acoustic
attenuation. One vent to be located in each habitable room.
DV4 ~ Delta Vent window tricklevent and grille with sliding manual control to allow 2,800mm2
equivalent area of ventilation, and optional trickle facility for when in closed position. One vent to
be located in each habitable room.
FV4 ~ Frame Vent window tricklevent and grille with manual control to allow 3,120mm2
equivalent area of ventilation, and optional trickle facility for when in closed position. One vent to
be located in each habitable room.
Passivent Fresh 80 ~ Manually controlled wall ventilator, allowing 2,220mm2 equivalent area of
ventilation in the fully open position. One vent to be located in each habitable room.
Passivent Fresh 90 ~ Manually controlled wall ventilator, allowing 2,630mm2 equivalent area of
ventilation in the fully open position. One vent to be located in each habitable room.
Passivent Fresh 100 ~ Manually controlled wall ventilator, allowing 3,200mm2 equivalent area of
ventilation in the fully open position. One vent to be located in each habitable room.
Passivent Fresh 99H ~ Humidity controlled wall vent to vary ventilation rate in line with relative
humidity, allowing 3,350mm2 equivalent area in the fully open position. One vent to be located in
each habitable room.
Specification Clause
Passivent Fresh TLF ~ Manually controlled wall ventilator, allowing 2,540mm2 equivalent area of
ventilation in the fully open position. One vent to be located in each habitable room.
TVALdB 450 ~ Manually controlled acoustic window ventilator, allowing 2,500mm2 equivalent
area of ventilation, and offering up to 40dB Dn,e,w acoustic attenuation. One vent to be located in
each habitable room.
TVALdB 800 ~ Manually controlled acoustic window ventilator, allowing 2,012mm2 equivalent
area of ventilation, and offering up to 42dB Dn,e,w acoustic attenuation. One vent to be located in
each habitable room.
Passivent Fresh 80dB ~ Manually controlled wall ventilator, allowing 2,220mm2 equivalent area
of ventilation in the fully open position, and offering up to 50dB Dn,e,w acoustic attenuation. One
vent to be located in each habitable room.
Passivent Fresh 90dB ~ Manually controlled wall ventilator, allowing 2,630mm2 equivalent area
of ventilation in the fully open position, and offering up to 45dB Dn,e,w acoustic attenuation. One
vent to be located in each habitable room.
Passivent Fresh 100dB ~ Manually controlled wall ventilator, allowing 3,200mm2 equivalent area
of ventilation in the fully open position, and offering up to 42dB Dn,e,w acoustic attenuation. One
vent to be located in each habitable room.
Passivent Fresh 99HdB ~ Acoustic Humidity controlled wall vent to vary ventilation rate in line
with relative humidity, allowing 3,350mm2 equivalent area in the fully open position, and offering
up to 45dB Dn,e,w acoustic attenuation. One vent to be located in each habitable room.
Passivent Fresh TLFdB ~ Manually controlled wall ventilator, allowing 2,540mm2 equivalent area
of ventilation in the fully open position, and offering up to 44dB Dn,e,w acoustic attenuation. One
vent to be located in each habitable room.
Extracts
One extract grille to be located in each wet room as follows.
Kitchen
A121 ~ Automatic Humidity Sensitive extract providing 15m³/hr (min) to 75 m³/hr (max) @ 80Pa
when operating between 30-75% relative humidity. Extract Diameter: 160mm. Spigot size: Ø
125mm.
Bathroom
A121 ~ Automatic Humidity Sensitive extract providing 15m³/hr (min) to 75 m³/hr (max) @ 80Pa
when operating between 30-75% relative humidity. Extract Diameter: 160mm. Spigot size: Ø
125mm.
En-suite
A121 ~ Automatic Humidity Sensitive extract providing 15m³/hr (min) to 75 m³/hr (max) @ 80Pa
when operating between 30-75% relative humidity. Extract Diameter: 160mm. Spigot size: Ø
125mm.
Utility Room
A121 ~ Automatic Humidity Sensitive extract providing 15m³/hr (min) to 75 m³/hr (max) @ 80Pa
when operating between 30-75% relative humidity. Extract Diameter: 160mm. Spigot size: Ø
125mm.
Specification Clause
WC
A121 ~ Automatic Humidity Sensitive extract providing 15m³/hr (min) to 75 m³/hr (max) @ 80Pa
when operating between 30-75% relative humidity. Extract Diameter: 160mm. Spigot size: Ø
125mm.
Other
A121 ~ Automatic Humidity Sensitive extract providing 15m³/hr (min) to 75 m³/hr (max) @ 80Pa
when operating between 30-75% relative humidity. Extract Diameter: 160mm. Spigot size: Ø
125mm.
Fan
Remotely located central A151DCH extract fan ~ Humidity Controlled Central Extract Fan
designed to run continuously, providing varying levels of extraction from a number of grilles
relative to humidity levels. Dimensions: H 326mm x W 303mm x L 271mm. Weight: 3.4kg
Voltage: 230V. Appendix Q: up to 0.4 w/l/s. Spigot size: Inlet: 4 x Ø 125mm. Exhaust:
Ø150mm.Humidity controlled central extract fan ducted to a roof terminal.
Fan to be Energy Savings Trust Best Practice compliant and have the following specific fan
powers in line with Appendix Q test methodology:
Kitchen + 1 additional wet room:
Kitchen + 2 additional wet rooms:
Kitchen + 3 additional wet rooms:
0.36w/l/s
0.30w/l/s
0.29w/l/s
Ducting
All ducting in roof spaces and other unheated spaces to be fully insulated with 25mm insulation.
The system to be Passivent iMEV Whole House system supplied by Passivent Limited, 2
Brooklands Road, Sale, Cheshire, M33 3SS. Telephone: 0161 905 5700, fax: 0161 969 5346,
email: technical@passivent.com.
Installation to be in accordance with the manufacturer’s instructions and to be carried out by a
Passivent Mastercare trained installer holding a current certificate.
Layout and installation must comply with any design recommendations supplied.