127mm Black Hole Ventilator Cowled Fixed Anti-Draught Baffles
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DETAILS
- Free Air: 30cm²
- Core drill ‘Black Hole'; ventilator BM725
- Rated Input - Max 13kW (44,000 Btu/h)
- Size: 127mm (5") diameter
- ‘Black Hole'; cavity liner and extension piece.
- Tube length from 228mm to 585mm with extension tube supplied.
- Brown outer cowl white inner grille.
- Fixed anti-draught baffles.
The BLACK HOLE Ventilation range:
‘Black Hole'; ventilation products provide the answer to the dangerous practice of ventilators being blocked off by occupiers who are being annoyed by draughts. This makes an important contribution to safety. New tests show that while this works the ventilator may not pass the required amount of air when the appliance is operating. THEREFORE IT IS IMPORTANT THAT A SPILLAGE TEST IS CARRIED OUT AS REQUIRED BY THE BRITISH STANDARD AND CORGI GOOD PRACTICE
The benefits of a ‘Black Hole';
The ‘Black Hole'; magic explained As outside wind pressure increases, a normal ventilator lets more air through causing annoying draughts.
Inside the Stadium ‘Black Hole'; Ventilator vortices are formed behind the internal blades as the incoming air is forced to change direction. The gap that the air is able to pass through narrows. As wind pressure increases, the vortices grow, so reducing the total air flow, finally tumbling and slowing to a trickle, thereby cutting down annoying draughts.
Stops wind blasting in - the air flow within the duct is slowed down by the change of direction and by the vortices formed, reducing draughts to a minimum.
Stops light showing through - the occupier cannot see through the ventilator and is less likely to be worried that insects and vermin may enter the house through it.
Stops light shining out - night flying insects like moths, crane flies and mosquitoes are not attracted in.
Absorbs outside noise - reduces the penetration of traffic noise. The internal construction works as a sound baffle.
Allows air to be pulled through by the appliance when it is operating.
Safety - with draught and light annoyance problems eliminated, the occupier will not be tempted to block off the vent.
However, when the heating appliance is operating, air is drawn through the vent and actually speeds up within the constricted air flow between the vortices, thus maintaining the correct amount of air into the room or compartment to allow the fuel to burn efficiently and flue gases to escape.
When the appliance is not working, incoming air is reduced to a minimum, even on windy days. The actual physical difference is that of air blown or drawn. The energy of the blown air (wind) is quickly dissipated by the restriction of the internal shape and the vortices, while the drawn air will flow smoothly round the vortices.
BS 5440 Part 2, 2000:
Several changes have been made to update the previous ventilation standard. Three of the main ones are summed up below but as with all new standards they are not retrospective.
1. The previous words ‘Free Air Space'; are replaced by ‘Free Area'; measured and Effective ‘Free Area'; (see point 3).
2. The ‘Free Area'; requirement has been increased from 4.5cm2 to 5cm2 per kW above 7kW input rating.
3. Complex and anti-draught ventilators shall be measured by the volume of air that they will pass i.e. the ‘EFFECTIVE FREE AREA'; . The ventilator should be marked accordingly. -
TECHNICAL
Technical Specifications
Product Category Passive Vent Product Type Black Hole Product Group Passive Ventilators Free air (cm²) - Max 30cm² Packaged Weight (Kg) 1.2 Packaged Length (mm) 365 Packaged Width (mm) 320 Packaged Height (mm) 70 Barcode 5060272545468 Barcode - Type EAN Manufacturer Product Code BM725 Quick Search: QS2851 -
REVIEWS
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Robert Stell
5 / 5 stars
Date Added: Saturday 24 February, 2018
Great product, as described on site. Excellent delivery arrived on time as promised. Now all fitted, very happy wth product and service. Would definitely buy from you again. Thank you. -
Philip Townsend 5 / 5 stars
Date Added: Thursday 02 December, 2010
The Black Hole Vent was as described but was not up to the required specification needed. I had been misinformed by my gas installer and so had to purchase an alternative ventilation product -
Jill Bredon 5 / 5 stars
Date Added: Tuesday 10 November, 2009
Thanks for a really quick service! Item is just as described anf the delivery was first rate. Will certainly use you again -
M F Wilson 5 / 5 stars
Date Added: Friday 14 August, 2009
Yesterday evening i ordered this item and i chose the cheapest delivery option which promised to deliver in about ten days or so.. nice one, that seemed good value because the price here was the best that i could find online and it was getting on for half of what some places were charging.. Astonishingly it arrived early this afternoon! Excellent service! -
Michael Joyce 5 / 5 stars
Date Added: Friday 05 September, 2008
Congratulations on a well thought out and practical website, I found it easy to use and informative -
Kiltox Customer 5 / 5 stars
Date Added: Thursday 27 September, 2007
" Thank you , Order received and now fitted , prompt service appreciated " - Mr G, Tyne & Wear - S/O 300772
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Q & A
Product Questions
Questions and Answers, do you need more information about this product?
Ask a QuestionYour question will be sent to a member of our team. We'll email you the answer and post it on this page. If your question is about an order you already placed, please use our Contact Form to reach the customer service team.
#1Black hole ventilator K-BM725Is the black hole ventilator available with a black outer cowl?
Question by Max Varnom, 20-07-2016Hi Max
The manufacturer does not have a black option though another manufacturer may have something compatible or close.
However, the cowls are not a gloss or polished finish and there would be no problem with spraying the dark brown option black, I have done this for a project before and used a spray paint designed for plastic products called (not unsurprisingly) Plasticote available from nearly all DIY outlets.
Replied by i-sells, 21-07-2016#2can you get a extension pipe for this itemQuestion by malcolm lewis, 06-08-2016Hello Malcolm
This does come with an extension tube as standard for wall depths of 585mmIf you need to go longer the Vario range has an extension tube of up to 1 mtr, to see enter BM418 in the search bar.Kind regardsIanReplied by i-sells, 08-08-2016#3where to locate Black hole ventwhere best should I locate Black hole vent. It is in my son's bedroom with two outside walls. There is black mold in the corner of the ceiling (along outside walls) and around the windows - double glazed with no trickle vents. (should I get thoese too?) with thanks Louise
Question by louise gray, 15-12-2016Hello Louise
If you are looking to cure a condensation and mould problem we would suggest you make an assessment of what is causing the problem, there is obviously an excess humidity issue at the root of it all so look at how your moisture producing rooms are ventilated.What method of extraction do you have in the kitchen and bathroom?If under ventilated, airborne water vapour will migrate to cooler rooms.How do you dry washing?Do you have house plants, fish tanks, calor gas appliances?Is the problem confined to one room only?Is the affected wall in this room north facing?Sorry for the interrogation but answers may help us guide you to the correct action to resolve your mould problem.Replied by i-sells, 15-12-2016#4Removing internal slatted vent coverI have this item installed in my living room for a flueless gas fire which I have now got rid of. I would like to stuff the through pipe with something to stop any draughts but i can't get the cover off. There don't appear to be any obvious fastenings. Does it just prise off or what ? I don't want to cause any damage. Any ideas please ?
Question by Ken Lewis, 19-01-2017Hello Ken
Thank you for your question. There are 4 lugs on the side of grille which can be pushed in with a screwdriver to release the grille. If I can help any further please do not hesitate to contact me.
Kind Regards
Anita
Replied by i-sells, 19-01-2017#5flueless gas fire requirementsDoes this vent meet the ventilation requirements for clueless gas fires?I read that these are " 100cm2 additional" -but not certain what that means?
Question by david ross, 27-11-2017Hello David
Unfortunately we cannot answer this question with accuracy as we do not know what gas appliance you have. You will need to refer to the manufacturers specification of your gas appliance this should state the free air requirement for safety and compliance. Once you have that information you will be able to relate it to the manufacturers published rating for this product for example in this instance - Rated Input - Max 13kW (44,000 Btu/h)Replied by i-sells, 01-12-2017#6MaterialWhat is the inernal vent made of? Can it tollerate high temperature close to an open fire?
Question by Tim Roe, 30-11-2017Hello Tim
The vent is made from rigid PVC with a temperature tolerance of +60 degrees CReplied by i-sells, 04-12-2017#7ventilation/damp issuesSir I have a basement flat which suffered a considerable amount of black wet rot which I found under laminate flooring, on the insulation and on the cement floor beneath which had been laid by the previous manager. The basement itself had not been lived in for four years and has double glazing without vents. After lifting the flooring, the cement seems to be drying out and turning grey again. However, the bottom of the internal walls appears to have some dampness. I know that I need more ventilation and am wondering if these black hole vents will help more air move around. The heating is from electric only. Thank you and please feel free to ask me any questions if you need more info. Regards
Question by Stephen Dadson, 19-03-2018Hello Stephen
If the property has been shut up for that length of time with no heating or ventilation we would expect there to be some damp issues particularly mould growth.If the floor beneath the laminate has been wet, and internal stud walls are in contact with it, the damp at low level may due to absorption, temporary installation of a dehumidifier should help speed the drying. The installation of ventilation with regard to potential occupants' lifestyle needs to be addressed and if passive vents are to be considered, bathroom and kitchen ventilation and how it is activated should be assessed. For bathrooms and kitchens we recommend constant running mechanical ventilation, heat recovery if possible, or low energy extraction with humidistat activated boost function. Examples can be seen by using the following search codes:- QS2838, QS12424, QS37219, QS45493 and QS39006Replied by i-sells, 21-03-2018#8MeasurementsJust bought an old 1898 house and in the lounge, we've got an existing grill over a misshapen approx 120mm deep hole in the external/internal brick wall (no cavity) leading to outside grill. There's a rough gap of 90mm x 150mm. I want to replace it with this vent being 127mm diameter. Do you think I could extend the hole with hammer and chisel to fit part?
Question by Rae, 10-01-2021Hello Rachel
Thank you for your question. If the existing hole is 120mm you will be able to purchase a 127mm core drill hole bit to make the hole bigger so this product can fit straight through.Kind RegardsAnitaReplied by i-sells, 11-01-2021#9Status updateHi - can you tell me if this order has been shipped yet? I can’t see the status update in my account. Aoife
Question by Aoife, 23-06-2021Hello Aoife
Thank you for your enquiry. I have checked your order and this has been placed onto back order which you would have been notified as this is out of stock at the manufacturers till 2/8/21. Please advise if you would like the order to stay on back order or if you would like us to refund you.I await to hear back from youKind RegardsAnitaReplied by i-sells, 24-06-2021 -
DELIVERY
Delivery: You'll receive in: Cost Min Order Free Delivery 3 to 5 Days FREE £100 Standard 2 to 4 Days £4.99 - Express Courier Next day+ £9.95 Any View Full Delivery Info
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+ Order before noon for Next Working Day Delivery for items in stock
Excludes Highlands, Islands, and Certain Postcodes.
Please Note: Ducting tubes over 200mm in diameter and 3 metres in length may incur additional shipping charges.
