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43 Burton Street
Brixham
Devon TQ5 9JA
Tel: 01803859303 dry@dryhomes.net

   
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Positive Pressure Heat Recovery Humidity Control Roof Ventilation Monitoring
Positive Pressure
How does Positive Pressure Ventilation work?
A positive input ventilation unit gently supplies tempered, filtered air into a home using otherwise unused heat within a roof.
(Return to PIV products)
 
Anti condensation drawing Anti condensation unit in loft
   
The benefits are enormous:
  • Firstly, it means that a significant proportion of external pollutants are prevented from entering the home.
  • Secondly, the use of the otherwise unused heat in the roof results in the ventilation unit providing a significant net energy gain to the home.
  • Thirdly, there is no better way to ventilate a home than from the inside out via a single, centrally located, supply air diffuser.

A good quality unit, fitted in your loft, will operate at an almost imperceptible noise level. The unit will ensure that stale, vapour laden air in your home is continuously diluted and replaced with good quality dry, filtered air. The result is improved indoor air quality and an environment in which condensation dampness cannot exist.

The old air exits through the thousands of air leakage points found in all homes. Indeed, positive input ventilation will even help to suppress unwanted infiltration (draughts and Radon gas).

The installation of a low energy PIV ensures the air in your home is completely replaced with better quality air around 20 times a day. This is the recommended rate to maintain good air quality and complies with the latest building regulations.

Energy benefits
.......your roof is a high energy source.

Slates absorb energy from the sun. Warm air from the house heats up the roof. During the heating season it will almost always be warmer than outside because of solar gain and conduction and convection losses from the home. Positive input ventilation units use the tiles/slates and/or the loft space itself to pre-warm the incoming air before delivering it into the home.

The input air enters your home at ceiling level, usually on your landing. This method re-circulates the warm air that rises and collects there as well as reducing the heat loss to your loft.

The slight pressurisation effect created helps reduce infiltration of unheated air through the leakage points found in all homes, having a consequential energy benefit.

In simple terms, a good quality low energy positive input ventilation unit will provide a significantly greater amount of energy into the home than the energy it consumes in the form of electricity, providing a considerable net energy gain.

BENEFITS   

·         Mould and mildew will not re-occur when the unit is switched on

·         Only on very damp or cold days will you have to mop the windows!

·         Automatic – works even when you are on holiday

·         Very cheap to run – about one quarter of a 100w light bulb

·         Will be effective in all rooms leading off the main stairwell

·         Solar gain ensures March to Oct the air from the roof is often heating the home

·         No need to empty any tank as the water vapour leaves with the stale air

·          5 year filters  - fine filters contribute to a reduction in pollen within the home

·         Auto cut off when roof is hot in summer

·         Reduction of heating costs as dry air feels warmer at a lower temperature

·         The home remains secure as no windows need be left open

·         Whisper quiet – slight motor noise like a quality fridge

·         Helps to suppress unwanted cold draughts

·         Easy installation by competent DIY or electrician - just connect to lighting circuit

·         Reduces cooking smells as they cannot escape into the stairwell

·         5 year filters and 5 year manufacturer guarantee

·         6 speed control to allow for differing conditions and house size

·         A dry home is a healthy home

DRAWBACKS

·         Most effective in the rooms off the hall – remote rooms have less air so the effect is reduced

·         Introduces cool air in winter which is quickly heated up at ceiling height. We do not recommend heated units as they are electric and gas central heating is a lot cheaper way of heating the air. Only 20% of the energy you buy actually heats the air! On average there is an energy gain using PIV.

·         We believe the only reason for buying a machine with a heating element is to temper the air in winter in a bungalow where the hall is small.

·         You may need sofit vents if the roof is too ‘tight’. This will allow airflow from outside. All roofs should already be well vented to preserve the timbers. Ask a builder.

·         Doors should be kept ajar, especially in the day, to improve circulation of the dry air – usually this is not a problem

·         No excuse to buy new shoes to replace mould ones….

HISTORY OF POSITIVE PRESSURE

·         The positive pressure system was discovered a by-product of a gas problem in Glasgow in the 1980’s.

·          A group of scientists tried to force the fumes from gas fires up the flu in some flats.

·         The tenants were getting poisoned because the fumes stayed in the rooms.

·         Positive air pressure was used to force out the fumes.

·         It worked.

·         But the flats became drier – the relative humidity dropped - moulds and dripping windows stopped as if by magic.

·         The heating bills were hardly affected and the tenants were happier.

·         The introduced air gradually left the building but took the water vapour (and the gas) with it.

·         Positive pressure condensation control was “discovered”.

·         After a lot of refinement this research resulted in the systems we supply today.

Top of page

Drimaster Standard
Click on the images to return to the PPV shop page

drimaster fan in roof spaceThe Drimaster unit installed in a roof space

Further information(PDF)

Installation and troubleshooting instructions (PDF)


(The standard Drimaster unit)

Anti Condensation Unit ACU

Positive Input Ventilation PIV

 

We recommend this positive pressure for standard homes with a roof space and where most rooms have doors into the stairwell.

Also very effective in a bungalow.

 
Positive pressure ventilation unit gently supplies tempered, filtered air from the roof voidBest buy

Buy now

 

Drimaster unitUnit prior to installation

Drimaster vent

Vent installation

BENEFITS

  • Extremely low power consumption. Average approximately 0.16 watts / litre /second and solar gains up to 550kW /hr / year.
  • Easy installation & very low maintenance requirement (Filter clean or replacement every 5 years).
  • Quiet operation
  • Significantly improves indoor air quality. Using positive input ventilation removes indoor air pollutants such as carbon monoxide and keeps out traffic fumes, pollen and outdoor pollutants.
  • System standby mode For summer months when loft temperature exceeds 27C.
  • Complies with the Building Regulation Ventilation requirements And contributes towards ‘conservation of fuel and power’. (Please refer to BBA Certificate 00/3727 for full details).
  • New Build “good practice” rating in GPG268
  • Radon gas control
  • SAP 2005 listing
  • Fire Damper and Diffuser for 3-storey accommodation available The diffuser is manufactured from aluminium and powder coated to an off white finish (RAL 9003). Code: Drimaster-3S.
  • Warranty Drimaster has a 5 year warranty.

DRIMASTER
The Drimaster provides whole home ventilation using the Positive Input ventilation principle. Essentially the concept is to introduce fresh, filtered air into the dwelling at a continuous rate, encouraging movement of air from inside to outside. To achieve this, the unit is mounted in the loft space, drawing air through the filters and inputting it, at ceiling level, into the property.
The Drimaster units are fitted with an internal temperature sensor. This sensor continuously monitors the temperature in the loft, boosting the air volume when the loft temperature is above a set level (heat recovery mode).
If the loft temperature becomes excessive the unit will switch to standby mode (no airflow). Once installed, the airflow can be set to suit the house size and, if required, the way it responds to the temperature changes within.

Fire Damper and Diffuser for 3-storey Accommodation The diffuser is manufactured from aluminium and powder coated to an off white finish (RAL 9003). The block has a honeycomb centre which provides exceptional strength to weight ratio, making it an outstanding core material for fire and smoke applications. It also has a high resistance to changes in ambient temperature so that the risk of warping is greatly reduced. Fully certified in accordance with BS476 Part 20, the block is designed to provide up to 83% free area and up to 4 hour fire rating for optimum performance. The damper is ideal for high air movement and suitable for aggressive environments and resistant to moisture. The damper is suitable
for internal situations with fast closure in a fire situation. Where there is a requirement please use the 3-storey diffuser.

Where there is a requirement for maintaining fire rating of the ceiling then the following alternative method of installing the diffuser using a 200mm dia. spigot available from us and a “Fire block” is recommended.
Designed to provide 1 hour of fire resistance in accordance with BS476 Part 20 (1987) and ISO 834, this circular “Fire block” is available to fit snugly inside our standard 200mm dia. spigot. (Part No. 011740).

Wiring
The unit is supplied with a pre-wired power supply. This power supply unit has a metal bracket incorporating fixing holes, which should be used to fit the power supply to a suitable surface e.g. a wooden joist.
The fan unit is also supplied with a fused spur. The two core mains cable from the power supply should be connected to a fixed wiring installation, via the isolator, via the spur, in accordance with current IEE wiring regulations.

Electrical details:-
Voltage: 240V 1ph 50Hz
Consumption: 1.6W(min)

DRIMASTER 2000
Click on the images to return to the PPV shop page

Drimaster 2000 installedThe Drimaster unit installed in a roof space

Further information(PDF)

Installation and troubleshooting instructions (PDF)


(The standard Drimaster unit including a sensor)

Anti Condensation Unit ACU

Positive Input Ventilation PIV

 

We recommend this positive pressure for standard homes with a roof space and where most rooms have doors into the stairwell.

Also very effective in a bungalow.

Positive pressure ventilation unit gently supplies tempered, filtered air from the roof void 


Buy now

 
The Unit prior to installationDrimaster unit
Drimaster sensorThe Drimaster 2000 sensor

Vent installation

Drimaster vent

BENEFITS

  • Intelligent heat recovery. Twin sensors optimise energy efficiency,adjusting settings to provide increased comfort.
  • Extremely low power consumption Average approximately 0.16 watts / litre /second and solar gains up to 550kW /hr / year.
  • Easy installation & very low maintenance requirement (Filter clean or replacement every 5 years).
  • Quiet operation
  • Significantly improves indoor air quality using positive input ventilation removes indoor air pollutants such as carbon
  • monoxide and keeps out traffic fumes,pollen and outdoor pollutants.
  • System standby mode. For summer months when loft temperature exceeds 27oC.
  • Complies with the Building Regulation Ventilation requirements and contributes towards ‘conservation of fuel and power’. (Please refer to BBA Certificate 00/3727 for full details).
  • New Build “good practice” rating in GPG268
  • SAP 2005 listing
  • Radon gas control
  • Fire Damper and Diffuser for 3-storey accommodation available
  • The diffuser is manufactured from aluminium and powder coated to an off white finish (RAL 9003). Code: Drimaster 2000-3S.
  • Warranty Drimaster 2000 has a 5 year warranty.

The Drimaster 2000 provides whole home ventilation using the Positive input ventilation principle. Essentially the concept is to introduce fresh,
filtered air into the dwelling at a continuous rate, encouraging movement of air from inside to outside. To achieve this, the unit is mounted in the loft
space, drawing air through the filters and inputting it, at ceiling level, into the property.

Siting the Remote Sensor
The Remote Temperature Sensor incorporates a clip-in fixing bracket which can be removed for easy fitting to a suitable surface. Select a suitable location for the sensor e.g. close to ceiling height in a bedroom or hallway BUT NOT WITHIN 3 METRES of the diffuser.

Fire Damper and Diffuser for 3-storey Accommodation
The diffuser is manufactured from aluminium and powder coated to an off white finish (RAL 9003).
The block has a honeycomb centre which provides exceptional strength to weight ratio, making it an outstanding core material for fire and smoke
applications. It also has a high resistance to changes in ambient temperature so that the risk of warping is greatly reduced.
Fully certified in accordance with BS476 Part 20, the block is designed to provide up to 83% free area and up to 4 hour fire rating for optimum
performance. The damper is ideal for high air movement and suitable for aggressive environments and resistant to moisture. The damper is suitable
for internal situations with fast closure in a fire situation. Where there is a requirement please use the 3-storey diffuser.

Where there is a requirement for maintaining fire rating of the ceiling then the following alternative method of installing the diffuser using a 200mm
dia. spigot available from us and a “Fire block” is recommended. Designed to provide 1 hour of fire resistance in accordance with BS476
Part 20 (1987) and ISO 834, this circular “Fire block” is available to fit snugly inside our standard 200mm dia. spigot. (Part No. 011740).

Wiring
The unit is supplied with a pre-wired power supply. This power supply unit has a metal bracket incorporating fixing holes, which should be used to fit
the power supply to a suitable surface e.g. a wooden joist. The fan unit is also supplied with a fused spur. The two core mains cable
from the power supply should be connected to a fixed wiring installation, via the isolator, via the spur, in accordance with current IEE wiring regulations.

Optional ‘BOOST’ facility
The unit air volume can be manually boosted to maximum speed by wiring in a simple one way switch (Part No. 773532) into the wire supplying the
sensor. By switching the unit to ‘BOOST’ all other functions are overridden.

Electrical details:-
Voltage: 240V 1ph 50Hz
Consumption: 1.6W(min) 15.3W(max)
Fuse size: 1 Amp

 

Heat Recovery Ventilator
To exchange wet air for dry and maintain most of the heat inside the home
Click on the images to return to the shop page

Heatex unit


When Appropriate

  • This unit is specially recommended in homes or flats with no roof void and a PIV cannot be installed
  • Very low voltage (12v) makes the HRV ideal for bathrooms and kitchens.
  • If there is no fan in a bathroom or kitchen why not fit one that works?  
HRV shielded to fit in wall
HRV outside diffuserThe outside diffuser
HRV heat exchanger exposed
HRV shielded to fit inside wall
HRV heat exchanger exposed
   
HRV control mechanism
HRV control box
HRV control mechanism including transformer
HRV control box

Benefits of Heat Recovery Ventilators:

    • Automatic – they work all the time even when you're on holiday
    • Very cheap to run – about quarter light bulb when on full power
    • Mould and mildew will not re-occur when unit is installed
    • Trickle ventilation – fast or slow gives a slow permanent supply of fresh air
    • No more wiping the windows every day
    • 80% of your heat comes back with the new air saving valuable energy
    • Safe low voltage power – 12 volt - so suitable for use in bathrooms and kitchens
    • The control unit is remote from the fan and is sensitive to the humidity away from the incoming air
    • Can be set to auto-switch to off in the dark so it can be installed in a bedroom
    • Will not cause draughts as the air flow is balanced
    • Filters stop dust entering the home
    • Reduction of heating costs as dry air feels warmer at a lower temperature
    • The home remains secure as no windows have be left open
    • Whisper quiet – there is a slight fan noise on boost
    • Removes smells in the room where the machine is installed
    • Only on very damp or cold days will you have to mop the windows!
    • Manual over ride switch for bathrooms or kitchens – use as an extractor fan
    • A dry home is a healthy home

Buy now


Humidity Control Fans
QuietAir  QT100HT

QT fanQuietAir  QT100HT
The best small fan HCF we have found!

Further information (PDF)


The best small fan HCF we have found!
Quiet , beautifully built and powerful….




Buy now


Click on the images to return to the shop
QT vent

 QuietAir  QT100HT
the best small fan HCF we have found! Quiet , beautifully built and powerful
Whisper - Quiet, Ultra low energy and Eco start technology
Model no: QT100HT  humidity and timer controlled
Product no:   9041261

An elegant, discreet axial fan that is supremely quiet and activates only when really needed - using exceptionally low energy
• Extremely quiet, 25 dB(A)*
• Delay start for two minutes avoids unnecessary use (especially at night), and saves energy
• Power consumption only 5 watts*
• Long life ball-bearing motor with 40,000 hours life
• Two speed options, 75 m3/hr* and 90 m3/hr
• Basic switching, adjustable humidity and adjustable timer
Quietair combines contemporary design with ultra low noise levels and outstanding energy efficiency.
Quietair sets new standards for the reliable, low cost ventilation of toilets, en-suites and bathrooms; and at just 25dB(A) you will hardly hear the fan running, even at night!
Low Energy, High Tech!
• High efficiency impeller delivers up to 60m3/hr through 12m of rigid ducting, including 90 degree bends
• Use in wet zone 1 when protected by an RCD and installed in accordance with latest IEE wiring regulations
• Integral flow straightener and back draught flap
• Low specific fan power for SAP assessments
• Clip-on cover for ease of cleaning
• Complies with latest Building Regulations Approved Document F

SPECIFICATION
Hole diameter 100mm
Airflow 75 m3/hr, 20.8 Al/sec
Airflow 31Pa @ 60 m3/hr, 16.6 Al/sec
Axial high efficiency impeller
Wall/ceiling mounting
Sound pressure 25 dB(A) @ 3m
Delay start 2 minutes
Adjustable timer (minutes) 6, 12, 15, 21
Adjustable Humidity 65% - 90% RH
Power 5/9 watts
SFP 0.24 @ 75m3/hr
Voltage - 230/1/50-60Hz
Rating IP45
Max. ambient temperature – 40C

Humidity controlled fans by Genie

 

Genie fansClick on the images to return to the shop

GENIE bathroom/toilet extract fans are, like other extract fans, designed to operate in conjunction with "rapid ventilation" such as openable windows and "background ventilation" such as trickle vents in windows to provide ventilation in accordance with Building Regulation requirements. Please refer to the following documents for additional information:

·       The Building Regulations (England and Wales), Approved Document F.

·       The Building Standards (Scotland) Regulations, Part K.

·       The Building Regulations (Northern Ireland), Technical Booklet K.

The range incorporates all the conventional methods of intermittent fan control such as pull cord control, humidistat control, occupancy sensor control, link to light switch control with run on timer, etc.

If there is concern over the occupants regular use of the "rapid ventilation" and "background ventilation" measures provided then the use of the GENIE-X, GENIE-X12 units are strongly recommended. These units operate continuously to provide background ventilation with boost extract as and when required. They do not therefore rely as much on the occupants use of the other ventilation measures to provide adequate ventilation in the home.

Features & Benefits

·       Complies with Building Regulation ventilation requirements.

·       Exceptionally quiet operation, imperceptible to a maximum of 30dBA @ 3m.

·       Various control options available.

·       Available in 12v and 230v models.

·       Suitable for surface, semi-recessed, window and duct mounting.

·       Flame retardant construction for optimum safety.

·       Clip in and push fit components for simpler and quicker installation and maintenance.

·       3 year parts and labour warranty.

·       Easily removed, cleaned and replaced push fit washable filter.
  
Genie parts

·       Interchangeable control modules.
  
Genie parts

·       Simple installation and maintenance using clip in components.

Genie parts

       Click on the images to return to the shop Buy now


 
Humidity controlled fans by Manrose.

Manrose fan unit

Manrose unit (similar to the image on the left)

WHEN APPROPRIATE.

  • We recommend these fans as the minimum measure to combat dampness in bathrooms
  • Timed fans do not control humidity.



    Click on the images to return to the shop

  BENEFITS

  • Auto humidity control can be set and left alone so condensation will be controlled day and night
  • Can cheaply replace an existing fan in a 100mm hole
  • Uses the same wiring as a timed fan where permanent live is available
  • DIY installation – we recommend you have the installation checked by an electrician
  • Energy used is very effective because it only runs when needed
  • Timed over run complies with Schedule F1 Building Regulations in toilets
  • this fan be used as a cheap trial – when you convinced it has a positive effect you can move on to a better system – a better fan or the HRV!

DRAWBACKS

  • Has limited capacity and therefore only used if the problem is small
  • If you have to drill a new hole it is better to invest in a HRV because the installation cost will be similar. The HRV has a 150mm diameter and is a very a much more efficient  machine

    Buy now


Hygrometer
Drimaster standard
Drimaster vent
Drimaster in roof

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Heatex
QT100 fan expanded
QT cover