Due to our policy of continuous innovation and improvement EnviroVent reserves the right to alter
products specication and appearance without notice.
You are about to install a product that is designed to outlast the life-cycle of the
building. Once installed the unit will operate continuously for 5 years and beyond
without a major service. Please therefore ensure that this product is treated with
care and installed properly i.e. for the life of the building. If the unit is mishandled
you might break it! This invalidates the warranty.
And remember, if you have any problems please call our dedicated Technical
Team. We are always pleased to help and in an emergency will come out to site
quickly, completely free of charge.
HOTLINE: 0345 27 27 810
PIV & MIV® Loft Mounted Unit
PRE-INSTALLATION CHECKLIST
Check that the loft has adequate cross
ow ventilation.
Check that all party walls are intact, seek
advice if the wall is missing or broken.
Check that any ue which passes through
the loft is not damaged, seek advice if the
ue is in a poor state of repair.
Check for any ued appliance which may
draw air from the loft, report to the client.
Check for any holes in the ceilings which
may allow leakage of air to the loft and
repair as appropriate.
Check that the water storage tank is
covered.
FIXING KIT
Description Item
8 X FOAM PADS
4 X PENNY
WASHERS
4 X PLASTER
BOARD PLUGS
4 X WOOD
SCREWS (10 X 1.5)
4 X WOOD
SCREWS (10 X 3)
4 X WOOD
SCREWS (8 X 1)
4 X WOOD
SCREWS (8 X 1.5)
ROLL OF
INSULATION TAPE
02
PIV & MIV® Loft Mounted Unit
INSTALLATION INSTRUCTIONS
IMPORTANT
Be sure to have read and understood these
instructions before beginning the installation
process.
Smoke Detectors
It is important that any open side of the plastic
diuser is not positioned within 1m of a smoke
detector. If the diuser cannot be repositioned,
up to two sides of the diuser may be closed
o using the plastic blanking plate supplied (Loft
only) so that the open sides face a minimum 1.5m
unobstructed path away from the detector. In 3
oor properties a metal re diuser should be
tted at minimum of 1m from the detector (see
page 8).
SAFETY AND RECOMMENDATIONS
• All wiring must comply with Building
Regulations and the current I.E.E. Wiring
Regulations (BS7671) or the equivalent
standards for your country. The nal installation
should be examined and tested by a qualied
electrician.
• Precautions must be taken to avoid the back-
ow of gases into the dwelling from the open
ue of gas or other fuel-burning appliances.
• Make sure the mains supply complies with the
rating label for voltage, frequency and phase.
• This appliance can be used by children aged
from 8 years and above and persons with
reduced physical, sensory or mental capabilities
or lack of experience and knowledge if they
have been given supervision or instruction
concerning use of the appliance in a safe way
and understand the hazards involved. Children
shall not play with the appliance. Cleaning
and user maintenance shall not be made by
children without supervision.
03
PIV & MIV® Loft Mounted Unit
INSTALLATION DIAGRAMS
STANDARD INSTALLATION
Also see page 7 for MIV® Loft Mounted Unit (twin spigot) installation method, and page 8 for installations
in 3 storey properties.
Installation diagram for the EnviroVent Loft Mounted Unit
UNIT DIMENSIONS
Dimensions of the EnviroVent Loft Mounted Unit - 470 x 405 x 372mm
*Unswitched fuse spur tted
with 3 Amp fuse
230V A.C.
3 core mains lead
For xing instructions, please
refer to the xing instructions
(gure 1) on page 5
650mm x 50mm x 25mm batten
Ceiling joists
405mm
Contents for unit
1 x Cardboard template
1 x Diuser
1 x Fixing kit
1 x Unswitched fuse spur
1m x 200mm Flexi duct
Additional contents for
unit with heater
1 x Heater enable switch
Heater enable/disable switch
(Heater version only) volt-free
*Subject to capacity, it is possible to connect the EnviroVent Loft Unit with heater to a lighting circuit. If
in doubt, wire through a ring main supply. Ensure the volt-free heater enable/disable switch is tted in a
suitable position for the user. This appliance must be earthed.
372mm
470mm
04
PIV & MIV® Loft Mounted Unit
INSTALLATION INSTRUCTIONS
SECOND STAGE
Position the EnviroVent unit on 50mm x 25mm wooden battens (not supplied) laid across the joists or raised platform
if the insulate is thicker than the joists so that the ducting between the unit and the diuser is not impeded. Lightly
screw the drilled battens to the joist through the rubber mounts and metal penny washer provided. Fit the ducting to
the unit spigot using half of the tape provided.
THIRD STAGE
Push ducting through the hole in the ceiling. Return to the hallway and connect the ducting onto the neck of the
diuser using rest of the tape provided. Ensure that the diuser is aligned correctly with the walls of the hallway. Adjust
if necessary. Fix the diuser in position using plasterboard plugs and the screws provided.
FOURTH STAGE
The EnviroVent unit must only be installed by a competent person and should be connected to an electrical supply in
accordance with the current electrical regulations. A disconnection device should be used in the xed wiring.
FIFTH STAGE
Check the unit is working correctly. Set the unit’s controls according to the house size and check that the lters are
securely in place.
SIXTH STAGE
Method of operation: Adjust the settings on the top of the unit by pressing the house setting button. By pressing the
button, the correct ventilation rate for the size of the house can be selected i.e. if the unit is on SMALL / TRICKLE and
the button is pressed, the unit will then switch to MEDIUM. Similarly, if the unit is on BOOST and the button is pressed,
the unit will then switch to SMALL / TRICKLE.
Fig.1 Fixing Instructions
FIRST STAGE
Position a dustsheet beneath the site you have chosen
for cutting the hole for the diuser. Protect your lungs
with a mask. Enter the loft space with the EnviroVent
unit and check there are no obstructions to your chosen
position for the diuser. Using the template supplied
mark the hole for the diuser and cut the 220mm hole
in the plasterboard (see page 7 for additional MIV
®
installation instructions).
N.B The unit is designed to be taken apart and
re-assembled to overcome restricted access through
small loft hatches.
10 x 3 screw
Penny washer
Foam pad
Foam pad
50mm x 25mm
batten with 20mm
clearance hole
Existing joist
SMALL /
TRICKLE
MEDIUM
PRESS BUTTON PRESS BUTTON
PRESS BUTTON
PRESS BUTTON
LARGE
BOOST
As a rule of thumb, the setting on the EnviroVent Loft Unit should match the number of bedrooms i.e. 1 - 4
05
PIV & MIV® Loft Mounted Unit
INSTALLATION INSTRUCTIONS
SIXTH STAGE cont. - Wireless units only
For heater enable/disable
To change speed setting
On commission the unit
will default to the trickle
ow rate with heater
enable on
Press button for ve
seconds turns heater
enable o. LED will
ash red for a few
seconds
Press button for ve
seconds turns heater
enable on. LED will
show constant red for a
few seconds
Press button once, to
indicate current fan
speed and heater status.
LEDs stay on constant
for a few seconds
Next press moves the unit to the
next speed and so on. When the
speed is chosen the LED remains
on for a few seconds
If the two LEDs situated just above
the button ash alternately red and
green (when it is pressed) the control
will need to be reprogrammed.
Call your maintenance company or
EnviroVent for advice.
Heater enable ON
Auto LED stays on constant for a few
seconds.
Heater enable OFF
Auto LED ashes for a few seconds.
Boost
(Green)
(Green)
Remote Control out of range (Red)
Heater enable
(Red)
Remote Control
in range
(Green)
When the battery needs replacing, unscrew the front
cover. The battery is located on the back of the cover.
Battery type - 3V Lithium, CR2032
LED Colours
Constant Red
Flashing Red
Constant Green
06
PIV & MIV® Loft Mounted Unit
Twin Spigot
This addition to the xing instructions explains the methodology of installing the twin spigot system.
This variation to the EnviroVent Loft Mounted Unit is necessary where:
The hallway is very small, particularly when there is limited heating in the house
The loft hatch lls the hallway ceiling
Air is required to be diused into a remote zone, such as a bedroom
Cut two 105mm holes in the ceiling in the positions chosen where air is required to be delivered. Use
the distance from the Loft Mounted Unit to each hole to balance/favour airow:
i. Equal air supply required - diusers equidistant from unit
ii. More air supply required in hallway - short run to diuser in the hall
(This is the recommended method of installation)
Connect the exi ducting to the twin spigot and hold in position with a cable tie on each outlet.
MIV® INSTALLATION INSTRUCTIONS
MIV® TWIN SPIGOT INSTALLATION
Example of installation: More air is required in hall - shorter run
HALL
Vent One
BEDROOM
Vent Two
Contents for unit
with heater
1 x Fixing kit
1 x Unswitched fuse spur
2 x Mini diuser
1 x Cable tie
1m x 3m x 100mm
Flexi duct
Additional contents for
unit with heater
1 x Heater enable switch
07
PIV & MIV® Loft Mounted Unit
INSTALLATION INSTRUCTIONS
SMOKE ALARM
For installations in 3 storey dwellings the loft unit
should be wired in such a way that it shuts down
completely when the smoke alarm system is
triggered. This can be done by linking the PIV unit
to relay type smoke alarm (N/C), see schematic.
When the relay is triggered by the alarm, power
to the PIV unit will be interrupted and the unit
will stop. When the alarm resets, power will be
resumed to the unit and the EnviroVent PIV will
resume working at its previous settings.
INSTALLATION CHECKS AND MAINTENANCE
The re system should be checked at installation
to ensure proper function. The diuser should
be periodically checked to ensure they have not
been activated and that they are still delivering air
into the property. In the case of a re, the system
should be thoroughly checked.
Ø125mm metal re diuser
Installations in 3 storey dwellings
PIV Loft Mounted Unit
FIRE INSTALLATION KIT
For installations in 3 storey dwellings, it is
necessary to t an EnviroVent PIV unit (EVL-W or
EVL-H-W) with a re kit, EnviroVent part number:
KIT-PIV-SMOKE. It is important to follow the
installation instructions that come with the kit.
MIV® Loft Mounted Unit
For installations in 3 storey dwellings, it is necessary to t an EnviroVent PIV unit (EVL-W or EVL-H-W) with
a re kit, EnviroVent part number: KIT-PIV-SMOKE.
08
PIV & MIV® Loft Mounted Unit
USER GUIDE
About your EnviroVent PIV & MIV® Loft Mounted Unit
DO YOU KNOW WHAT’S GOING ON IN YOUR OWN HOME?
In a dwelling of 4 people, each will contribute
approximately 4 pints of moisture per day –
through showers, boiling kettles, cooking etc
totalling over 100 pints of liquid per week.
Other airborne contaminants which exist in a
typical dwelling like dust, tobacco products,
exhaust gases – even chemical emissions
from furnishing and building products further
deteriorate air quality.
In older, less energy ecient dwellings, there
is a natural escape for this hot, damp problem
air – through ill-tting windows and doors,
uncarpeted oorboards, lofts without insulation
and so forth.
Improved building features such as cavity wall
insulation, double-glazing and draft proong
prohibit ‘natural ventilation’. Stale, humid air is
trapped – increasing the condensation problem
in the dwelling.
THE CAUSE OF CONDENSATION, DAMP AND MOULD
The Benets
Say goodbye to condensation & mould
Whole house ventilation
Improved air quality
Musty odours removed
Streaming windows stopped
Condensation control
Enhanced heat distribution
Benets allergy and asthma suerers
MOISTURE
The typical household creates around
100 pints per week - from showers,
baths, cooking etc.
CHEMICAL EMISSIONS
From everyday household
furnishings, building products etc.
FUMES
From tobacco products, exhaust
gases etc.
DUST
From furniture, carpets, bedding etc.
= Poor Air Quality = Condensation, Damp & Mould
10
PIV & MIV® Loft Mounted Unit
How does my Loft Mounted Unit work?
The Loft Mounted Units work by supplying fresh, ltered air throughout the home to transform a
stagnant and stale atmosphere into a fresh, healthy and condensation-free environment.
The units can deliver air into a home via a single input, usually located in a central landing (PIV Loft) or
via twin inputs, located in a central landing and another area of the home (MIV
®
Loft).
How does my Loft Mounted Unit help?
It prevents the build-up of moisture in the house, controlling steam/condensation during bathing and
cooking to prevent the formation of black mould on walls, behind cupboards etc. It will also help to stop
general dampness and musty smells caused by poor ventilation.
11
PIV & MIV® Loft Mounted Unit
Energy Saving Benets
Your Loft Units also help to save energy in the following ways:
Minimum Energy Consumption
Using the latest technology, the units are powered by ultra-low watt motors to achieve low
running costs.
Solar Gain
The units* take maximum advantage of the benets from solar gain within the loft space. This
is the natural accumulation of heat from the sun on bright days. Temperatures in the loft are on
average 3°C higher than outside, which results in a relative saving of around 150 Watts per day
in an average modern family home. This equates to approximately 10% of annual heating costs.
Heat Distribution
Warm air accumulates at ceiling level. This air can be up to 7°C higher than the internal air at
ground level. By introducing an air supply from the loft space, the Loft Units help to redistribute
heat around the home to further reduce heating costs.
No need to open windows
To reduce humidity and condensation during the heating season, signicant energy loss occurs
by opening windows. The Loft Units provides fresh, ltered air to the home and reduces humidity
without the need to open windows, saving energy and heat loss.
Health Benets:
Reduces mould spores, a trigger for respiratory problems and allergies
Reduces house dust mite populations by lowering humidity levels - a main trigger for asthma
and allergies
*except the Inline models
How do I control my Loft Unit?
The whisper quiet Loft Units operate continuously 24 hours a day. It is important that the unit is not
turned o.
On auto the ow rate of the unit will be set at the appropriate level for your home during installation. To
enable or disable the heater press the heater enable switch on or o.
Optional Wireless Switch Models
If you have a remote control switch you can change the unit ow rate/speed at any time at the push
of a button. You can also use it to enable or disable the heater (see page 6 for operation instructions).
12
PIV & MIV® Loft Mounted Unit
What features does my Loft Unit have?
The intelligent low temperature comfort heater* is designed to temper the air during periods of low
external temperatures. It is capable of holding incoming air temperatures accurately at 10°C. With the
function enabled, the heater may be on 10% of the time, depending on the fan speed setting and only
at loft temperatures at or below 10°C.
When the input air temperatures rises above 25°C, the unit will temporarily shut down the supply, to
avoid bringing hot air into the property.
The units have an automatic increased airow setting. This function increases airow rates per setting
by 10% to deliver additional air into the property at temperatures above 19°C.
*Heater may be omitted on request by the customer.
Maintenance
The Loft Units have been subjected to rigorous testing and are constructed from durable materials.
There should be no requirement for any maintenance within the ve year period.
At the ve year service, the loft lter located on the unit must be replaced to ensure maximum eciency
of the unit. The lter is mounted around the unit with velcro, simply pull o and replace.
How much does my Loft Unit cost to run?
The Loft Units are very energy ecient. On a constant medium setting with the heater enabled, the
unit will cost around £30* a year to run. With the heater disabled the unit will cost less than £6* a year.
*Based on an average electricity unit price of 15p.
Costs will vary year on year depending on atmospheric conditions and unit settings.
Helpful hints and tips
Keeping your home condensation free:
• Try to keep the house as warm as possible for as long as possible
• Do not dry clothes over any radiators
• Vent your tumble dryer outside
• Do not use paran / Calor gas type heating
Energy bills:
• To minimise energy bills you may need to adjust the central heating down if the input is in the same
room as your thermostat.
13
PIV & MIV® Loft Mounted Unit
WARRANTY CONDITIONS AND EXCLUSIONS
The EnviroVent Loft Mounted Units are covered by a 5 year warranty (7 Year with Rapid Response PIV only).
Do not turn your unit o. It is important that the unit runs continuously.
EnviroVent oer customers a full Supply and Fit service. This service also entitles our customers a
unique 5 years parts and labour guarantee (7 Year with Rapid Response - PIV only) and if within the 5
years of installation the unit breaks down, we will repair it – FREE of charge.
Should you buy the fan from an approved wholesaler the product is protected by a 5 years parts
guarantee (7 Year with Rapid Response - PIV only) and in the highly unlikely event of any problems you
can call our helpline number or return it to the approved wholesaler.
Please note that proof of purchase by the way of a receipt is required and that any fans bought from an
unapproved source, including but not limited to Ebay, will render the guarantee invalid.
What should I do if I have a problem?
If, after thoroughly reading this booklet, you feel that your unit is not working correctly, you can
telephone the number shown at the bottom of this page (operational from 8:30am to 5:00pm Monday
to Friday), and ask for technical assistance.
Serial number of the unit
We appreciate you choosing this quality EnviroVent product, which is designed and manufactured to
the highest specication in Harrogate, North Yorkshire. We are condent that you will be delighted
with the performance of the system and the resulting improvement in air quality in your home after the
installation of the unit.
Your warranty covers any defect or break down that arises due to faulty materials or construction.
Terms of Warranty
• The system must be correctly installed and operated according to the instructions contained in the
user guide supplied.
• Periodic cleaning and maintenance must be carried out by a technically competent person.
• The warranty will be rendered invalid if the unit is turned o. Turning the unit o can damage it.
• The warranty does not cover accidental damage, misuse or abuse.
• The warranty is in addition to your statutory or legal rights.
• The warranty will only be honoured from approved suppliers.
• A further 5 year warranty can be obtained subject to the level of service carried out at the 5 year point
(7 Year with Rapid Response - PIV only).
14
E&OE | MKT ENV225-V8-26.08.16
Due to our policy of continuous innovation and
improvement EnviroVent reserves the right to
alter products specication and appearance
without notice.
EnviroVent Ltd
EnviroVent House
Hornbeam Business Park
Harrogate
HG2 8PA
T 01423 810 810
F 01423 301 022
E info@envirovent.com
www.envirovent.com
AFTER INSTALLING THIS FAN PLEASE PASS ONTO END USER - DO NOT THROW AWAY
Please read carefully to ensure simple installation and a
long trouble free life for the user.
We want to hear from you
Your feedback is important to us as we strive to improve our products, services, and overall
customer experience. Please email us to help us serve you better: feedback@envirovent.com
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