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Details about  Unpowerd Auto Humidity Wall Ventilation Vent Damp Mould Room Window condensation

Unpowerd Auto Humidity Wall Ventilation Vent Damp Mould Room Window condensation

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Cheltenham, United Kingdom
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Last updated on  31 Jan, 2015 17:36:51 GMT  View all revisions
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Item specifics

New: A brand-new, unused, unopened and undamaged item in original retail packaging (where packaging is ... Read moreabout the condition
Type: Dehumidifiers
Finish: white
Visit Shop:   two47sales
Automatic in wall Ventilation System (Auto Vent)


Reduces Humidity & Condensation with minimal heat loss

Postage discount available please see Postage and payments tab above

Made in Europe

This is a demand-controlled vent which responds automatically

to changes in room humidity

Designed specifically to combat condensation problems

Help save the planet and some money for your self !

Items above provided in the kit

Colour - White

Included in kit:- Auto Vent Unit,  Through Wall Connecting Pipe,

all Screws and Raw Plugs, Outside Grill and Fitting Instructions

Energy saving

provides ventilation only when needed, minimising loss of warm air.

Can be used to meet the background ventilation requirements of building

regulations throughout the UK and the Republic of Ireland,

Also meets the requirements for security, adjustability, avoidance of

discomfort due to cold draughts and prevention of rain ingress.

Recommended installation height is 1.8m above floor level

Site either in corners of rooms (at least 350mm from any inside corner)

or above radiators to avoid convection and air mixing


As detector and driver of our humidity sensitive products, the hygro-sensor

 exploits the natural tendency of certain materials to expand and contract 

with the rise and fall in airborne humidity. On this principle, 16 polyamide bands

of the sensor activate one or more shutters, thus determining the passage of the air

 according to the ambient relative humidity rate. The greater the level of humidity,

 within building, the more the shutters are opened. The sensor is isolated from

the incoming airflow to ensure that it only measures the indoor humidity.

High quality outside grills with integral fly screen 

Please advise colour of outside grill when placing an

order in notes or white will be sent


To be fitted to an outside wall, Tube provided is 350mm long

Will need drilling a 100 mm approx hole through a wall

( 25.4mm - 1 inch )

We also have various trickle vents in our ebay shop

Small is 300mm, just under 12 inches long

Large is 400mm, just under 16 inches long

These are high quality trickle vents that will not fade or change colour in sunlight

Modern Living

In a world of increasing environmental concerns and rising energy prices the modern home has become much more energy efficient. Generally this is a good thing but there can be some associated drawbacks with this new way of living. Up to about the late 1960’s there was natural ventilation in many homes because of the lack of double glazing, poorly fitting windows and doors and open fire places. Present attitudes have eliminated natural ventilation by the use of double glazing, draught excluder's, fitted carpets (preventing air movement up through suspended wooden floorboards) and the removal of open fire places with the introduction of central heating.


Buildings have been effectively sealed and provide better conditions for condensation and airborne contaminants from flooring materials, furnishings and cleaning products. Not to mention exhaled air and (possibly) tobacco smoke can build up and are adverse to health. Damp can arise from the many sources of water vapour in the modern house. Current building regulations require ventilation be fitted to new homes to maintain a flow of healthy fresh air through the house and prevent internal air contamination and damp. However they are often omitted from replacement windows because their function is not fully understood and because of the increased costs. And yet indoor air quality and effective ventilation is more important now than ever, not only for the buildings but for its occupants.


The Repercussions of Air Tight Homes

Fresh Air is healthy, stale air is not. Here’s why


The usual concentration of oxygen in the atmosphere is 20.9%. Without adequate ventilation this level is reduced surprisingly quickly by breathing and combustion. The air we breathe is a mixture of gases including nitrogen, oxygen, carbon dioxide, water, argon, and trace gases. Each day we inhale around 14,000 litres of air as we take about 26,000 breaths (That’s equivalent to about 150 full bathtubs) As we process a breath of air we remove a certain amount of the oxygen and exhale unwanted gases. If the house or room does not allow the air to be replenished with fresh air the oxygen levels drop as we re-inhale the same air again and again. This is obviously unhealthy. If there is a smoker in the house the used air will also contain some very toxic gases which will be breathed by all the occupants in the house. There are many articles on the physiological, biological and physical affects of poor air quality.

Moisture is produced in abundance in modern living conditions. Inadequate ventilation cause damp, mould & rot

 Please find below some of the sources

Breathing, Perspiring

An average person inhales and exhales a volume of half a litre of air with every breath. The exhaled air is at 100% humidity. This means that two sleeping adults produce 1 ½ pints of moisture every 8 hours which is absorbed as water vapour into the atmosphere. We perspire 24 hours per day this is partly why we need to consume 3 litres (5 ½ pints) a day, 1 litre of those is supposed to be had through food.

Cooking, Tea Making

Saucepans and kettles generate steam which is absorbed by the surrounding air. An average gas cooker can produce approximately 1 ½ pints of moisture per hour by burning gas

Washing Up, Laundry

The vapour cloud given off by hot water is rapidly absorbed into the atmosphere

Bathing, Washing and Wet Clothing

These are major sources of water vapour in the home. Remember even cold water constantly evaporates into the atmosphere

Home Heating

A flueless gas heater can produce up to 2 to 3 pints of moisture per hour. Paraffin heaters produce 8 pints of moisture for every 9 pints of fuel burned

Indoor Plants

A frequently unrecognised source of water vapour. Not only from plants but the soil they are in

Flushing Toilets

Water is atomised every time you flush. Water and the other are expelled into the atmosphere without being seen. Time to move your toothbrush to another room!!

Pets and Animals

Pets also have the same effect as humans on emitting moisture and odours in the home. Aquariums and fish tanks are another source of water evaporation into the surrounding atmosphere

Fridge and Freezer

Fridges remove moisture from the fridge mechanics and expel this moisture at the rear as vapour near the condensing coil


To illustrate how much water vapour is in the air, fill a glass from the cold tap. Water droplets will form on the outside of the glass as moisture from the air condenses on the cold surface, like dew on a cold morning.

The normal moisture content of air is dependant on air temperature the warmer the air the greater capacity to hold moisture average humidity is about 40% to 60% with optimum humidity being 50% for a healthy human environment. Humidity falling lower than 40% is also adverse to a healthy environment but excess moisture in the air will be absorbed into the fabric of the building causing damp and rot. Hence roofs are vented as are wooden suspended floors.



Poisonous Gases and Vapours


Carbon dioxide might be grabbing all the headlines but its carbon monoxide that is the killer. The emission of carbon monoxide from badly serviced heating systems in poorly ventilated rooms has caused death in extreme cases. In some areas radioactive Radon gas can permeate up from the ground and build up in poorly ventilated houses. Methane and Second hand tobacco smoke which contains over 4,000 chemicals, including 43 known cancer-causing (carcinogenic) compounds and 400 other toxins. These include nicotine, tar, and carbon monoxide, as well as formaldehyde, ammonia, hydrogen cyanide, arsenic, and DDT . Volatile organic compounds (VOC's) are gases or vapours emitted by various solids or liquids, many of which have short- and long-term adverse health effects. Household products that emit VOC's include paint, paint strippers, cleaning supplies, pesticides, glues and adhesives, building materials and furnishings. Consequently, concentrations of many VOCs are higher indoors (up to ten times higher) than outdoors. VOC's are compounds that have high enough vapour pressures under normal conditions to significantly vaporize and enter the atmosphere. A wide range of carbon-based molecules, such as aldehydes, ketones and other light hydrocarbons are VOC's.



Other Causes of Household Air Pollution


Electrical devices and some man made products such as Nylon, rubber and plastic produce positive ions which attract atmospheric pollutants, dust particles and harmful airborne matter into interior spaces, all obviously unhealthy. Conversely, negative ions enhance your feeling of well being. Mother Nature constantly produces negative ions outside the home, from rainfall and wind for example, but not having adequate ventilation means negative ions will not get in. To experience the affect of negative ions take a shower or turn on a cold tap and place your head close to where the water is striking the surface of the sink. You will smell a sweet cold odour. This indicates the presence of negative ions, the same as after a rain storm, sitting by the sea or a waterfall. That is why the Victorians recuperated near the sea and is why you find the shower invigorating.




We emit odour 24/7 through perspiration and breathing as do all pets and animals. Any materiel that is in a moisture laden atmosphere will give of a musty odour as does any room closed for a period of time from the main house without adequate ventilation. Cooking creates a multitude of odours so does the ingredients. The toilet obviously is a candidate for odours as are porches or boot rooms which houses coats and shoes. Cleaning chemicals used around the home. Tobacco smoke or an open fire or naked flames used for heating or show.



Regulations, Recommendations & Figures


It is the law that ventilation be provided in every new house or extension built onto an existing property and any rented property. The calculation for ventilation required for a new home takes into account the size of the dwelling, amount and types of rooms etc. This is too complicated to explain here.The recommendation for ventilation in existing properties is approximately 4000mm2 (one large vent) of fresh air for a habitable room like a living room or bedroom and 2000mm2 (one small vent) for a non habitable room like a toilet,

bathroom, cloak room or porch. If there is no ventilation except the habitable room then 8000mm2 is recommended (two large vents). Recently specifications have changed adding new terminology now trickle vents have a measured air flow in equivalent area (EA) requiring further explanation. Home owners can easily become confused making it difficult for the salesperson to justify the product and additional expense when replacing the windows and doors. To illustrate this point please consider a typical scenario:


Sales person 

“ Here you are Mrs Smith all your windows incorporating eco glass to save you on your heating bill fitted and guaranteed for only £3500 ”


Mrs Smith 

“ Yes that looks good but what are these trickle vents on your quote? ”


Sales person 

“ They allow you have ventilation in your home all of the time. It’s a good idea and helps stop condensation ”


Mrs Smith 

“ I am replacing the windows because they are draughty and my windows don’t cause condensation at the moment ”


Sales person 

 The new windows will be air tight, and this may cause condensation to form on them which is why we have the trickle vents. Trickle vents aren't draughty, you can close them if you wish ”


Mrs Smith 

“ Why should I spend money on something that I will not use? I want lower heating bills. That’s why I want new windows but to buy new windows with a hole in them to let air in! No thank you! "


Faced with this scenario the sales person often omits the trickle vents as it complicates and may jeopardise the sale, especially when condensation on the windows is mentioned. In brand new houses occupants often fill the vents with cotton wool and close them without realising that the bricks, timber, concrete and other materials in average three bedroom houses absorb approximately 1500 gallons of water during construction which will dissipate into the internal air during the drying out period which can take up to a year. Occupants of bed-sits which are built to building regulations will have fire doors with fire strips so smoke can’t enter or leave the room. Obviously neither can fresh air but even if trickle ventilation is fitted tenants often close them due to the previously explained misunderstanding of their purpose. 


Two Products with Synergy


For ventilation to work properly a minimum of two vents is needed. One in isolation will do very little, more than one vent allows cross ventilation, fresh air in and stale air out. If only a single outside wall is available then one vent should be at least 600mm above internal floor level and the other at least 1.6meters above internal floor level.The difference in air temperature from floor to ceiling will aid in the air circulation through the vents.



Trickle Vent


Used in toilets, porches, conservatories, cloak rooms, living rooms, kitchens, bedrooms and hallways etc. They are available in many colours and designs normally fitted in to the sash, vent (opener) or head of a window or door. You simply control with a finger touch lever to open or close the vent. Can easily be retro fitted to an existing window or door with a series of holes ranging depending on trickle vent design and size from 8mm to 13mm. Circular clear plastic vents can be fitted into the glass but this will affect the longevity of a double glazed unit, not a common solution anymore and very expensive to buy and fit.



Humidity Wall Vent ( Auto Vent )


This vent is fitted through an outside wall. This vent opens and closes depending on the moisture content thereby not wasting heat. It is particularly good for bathrooms as it avoids the need for a noisy fan. A combination of auto vents and trickle vents will work together allowing moisture laden air to be exchanged for fresh air and will minimise the energy wasted. In a house of multi occupancy (HMO) or bed-sit the auto vent is the superior solution. When the door is opened and closed the auto vent also automatically opens allowing an exchange of air adding a second benefit to the primary role.



Summary of the Two Benefits


First - is eliminating damp that will form in corners of rooms, behind furniture, on windows and external walls (especially if north facing) and mould (fungi) on window seals and internal window cills. Not forgetting damp clothes, bed linen and creatures that thrive in these conditions such as silver fish, lice and house mites. In fact there have been approximately one hundred species of fungi detected in dwelling houses. The species commonly encountered were Penicillium, Cladosporium, Rhizopus, and Mucor. Fungi specifically encountered on paint and plaster were for example Cladosporium cladosporioides, Aspergillus niger, Penicillium purpurogenum and Mucor plumbeus.



Second - is the exchange of air. Air quality is very important. We need fresh air to be healthy. It also helps with our moods and our general well being and allows a good nights sleep. Fresh air also helps to eliminate positive ions, chemicals, particles, dust, viruses and air borne spores that can come from house materials, damp surfaces, people and their activities. Fresh air will replenish negative ions and oxygen. Studies show even house plants benefit from clean air that contain less of the pollutants that was found in an average dwelling. Pets would also be affected by many of the chemicals found especially from second hand tobacco smoke and modern materials.



Please Note - Mechanical ventilation that uses a motorised fan to extract air from the kitchen can not be solely replaced with trickle ventilation as all trickle vents are for background ventilation and will not remove cooking smells or toilet odour efficiently. If a gas appliance is fitted then permanently open ventilation is mandatory as it can be a life saver some 10,000mm2 ventilation is the minimum where the gas appliance is located.


When gas does not burn properly, as with other fuels such as coal, wood or oil, excess carbon monoxide is produced, which is poisonous. You can’t see it. You can’t taste it. You can’t even smell it. But carbon monoxide can kill without warning in just a matter of hours.


You are particularly at risk when you are asleep because you cannot recognise the early symptoms of carbon monoxide poisoning. These include tiredness, drowsiness, headache, nausea, pains in the chest and stomach pains. These symptoms can mimic many common ailments and may easily be confused with flu or simple tiredness.


Every year about 20 people die from carbon monoxide poisoning in the U. K. Many others also suffer ill health


* your appliance was poorly installed                                                           * your appliance is faulty


* your appliance not checked or maintained regularly                               * there is not enough fresh air in the room


* non-GAS SAFE engineers to install or maintain your appliances             * your chimney or flue is blocked up




In a bedroom especially a bed-sit, fitting a trickle vent to a window

and an Auto vent fitted in the outside wall allows cross ventilation

Optimum results will be achieved in air circulation, minimising moisture and air quality related

 problems, minimising the loss of valuable heat while retaining maximum intruder security


Item can be viewed and collected from our factory in Cheltenham

 To Pay with credit card please ring 01242 254222

Open Monday - Thursday 7.30am - 4.30pm

Friday 7.30am - 1.30pm

Any further information please ring 01242 254222

Positive feedback ratingExcellent. Exactly as described, on schedule and good quality item...Buyer: During past month
 Unpowerd Auto Humidity Wall Ventilation Vent Damp Mould Room Window condensation £59.95View Item
Positive feedback ratingSuper quick delivery, great product! Highly recommended. ThankyouBuyer: 22-Mar-14 22:39
 Unpowerd Auto Humidity Wall Ventilation Vent Damp Mould£59.95View Item

Positive feedback ratingGreat service, recommended seller.Buyer: 04-Feb-14 19:44
 Unpowerd Auto Humidity Wall Ventilation Vent Damp Mould£59.95View Item

Positive feedback ratingpatr arrived next day just got it fitted works a treat thanksBuyer: 26-Nov-10 23:00
 Unpowerd Auto Humidity Wall Ventilation Vent Damp Mould£49.99View Item
Positive feedback ratingHappy with purchase & serviceBuyer: 10-Oct-10 22:48
 Unpowerd Auto Humidity Wall Ventilation Vent Damp Mould £49.99 
Positive feedback ratingvery good seller ...thank youBuyer: 
gufo8338 10Yellow star icon for Feedback score between 10 to 49) 
30-Sep-10 14:08
 Unpowerd Auto Humidity Wall Ventilation Vent Damp Mould £49.99
Positive feedback ratingquality genuine item, as described. good mail contact. highly recommend.Buyer: 09-Apr-10 21:21
 Vents For Damp Rooms£49.90

Business seller information

Regent Windows
VAT number: GB 850266250

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Item location: Cheltenham, United Kingdom
Postage to: United Kingdom
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