Overview
With the growing concerns about over ventilating properties, the Multispeed Multivent offers the option of 'Close Control' both in the residential and the commercial sectors. With a DC motor that can be set to ventilate any area up to 444m³, the Multispeed Multivent is the most efficient central extract unit in the UK.

The unit has 7 pre-set speed settings based on typical house sizes, offering performances from 155 to 444m³/h. Within each of the 7 settings are 5 different speeds for various functions such as present, not present, 2 people occupancy, a night time setting and boost.

Once a house size has been selected the controller that comes complete with the unit can be connected to the system. The controller has 5 buttons to select the 5 different speeds.

Installation
The unit can be installed either horizontally or vertically and where the ambient air has a high humidity content condensate drains are provided.

Performance & Power Consumption

Dimensions (mm)

Weight: 5.50kg

Sound Levels

	dB(A) @ 3m
	Casing Breakout	Duct Inlet 100mm Ø	Duct Inlet 125mm Ø
MVDC-MS   High	38.8	51.7	51.5

Published dB(A) figures are free field sound levels at 3m with spherical propagation at a reference level of 2 x 10–5 Pa.The free field sound power level spectra figures are dB with reference of 10–12 Watts.

Controllers

Main Controller
	The main controller has 5 settings and is connected to the Multivent unit by a 3-core mains cable. The settings are: 1 for when the property is occupied, 1 for when the property is unoccupied, 1 for when only two people are present, 1 for night time setting and 1 for a boost setting.
• Boost • Present • 2 People • Night time setting • Not Present	= 100% of selected house speed = 75% of selected house speed = 50% or 38% (selectable via a jumper/dip switch) of selected house speed = 40% of the selected house size = 25% of selected house spee

Optional Slave Controller
Humidstat®	The slave controller is wireless and remotely connected to the main controller. Can be used to boost the system by de-pressing the central button. The controller can be set to boost at various intervals between 5mins and 180mins.

Typical Specification
Supply and install a Multivent Multispeed Wholehouse Central Extract unit for wholehouse condensation control as manufactured by:

Vent-Axia Clean Air Systems
Fleming Way
Crawley
West Sussex
RH10 9YX

Performance:	m³/h	l/s
Max ventilation rate	444	123.3
N° speed per house settings	5

Motor: A brushless LoWatt Energy Saving DC motor should be used with ball race bearings, greased for life. It shall operate up to an ambient temperature of 40°C and have software fault detection.

Fan: Fan: The impeller should be a centrifugal backward curve type, dynamically balanced, mounted directly onto the motor.

Controls: A main controller is supplied as standard providing 5 fixed speeds. There are 7 different house sizes selected at installation via the main controller. Each Wireless controller can provide 1 extra speed from a selection of 10 available as a percentage of the selected house size 10, 20, 30, 40, 50, 60, 70 ,80, 90, 100%).

Up to 4 wireless controllers can be used with one Multispeed Multivent to provide up to 4 additional speeds.

Ducting spigots: Ducting spigots: The unit should have 4-N° 100/125mm Ø extract points and 1 x125mm Ø outlet to atmosphere. (Can be converted to flat ducting).

Filter: not fitted.

Condensation: Two 15mm condensate drain outlets on the side of the unit at both the top and the bottom for different mounting positions.

Construction: The unit should be moulded in ABS plastic.

Sound Levels: Refer to above table for maximum performance.

Mains electrical supply: 230VAC 50Hz.

Complies to the following approvals/directives: LVD, EMC, BEAB and CE.