BORA extraction ducting


Why choose BORA ducting? 

You have chosen your high quality BORA venting hob what else do you need?

If you have opted for the recirculation models, PURE - PURU, X PURE - PUXU, S Pure - PURSU etc. then everything you require will be in the box ready for installation, come back and visit us when you hob notifies you that the filter requires changing.

Important facts to remember when planning you purchase, only BORA ducting component's should be used to ensure the maximum extraction rates are maintained.

BORA round ducting:

Smooth, non-inflammable duct components, the diameter is Ø150 mm throughout the run ensuring the maximum air flow, even a small reduction in surface area reduces the free air flow considerably, please do not change this. 

Extend flexible ducts to the maximum and cut them to size, ONLY use flexible ducting for a small awkward section.Remember any reduction in duct size not only reduces air flow but generates additional noise.

Ensure all the BORA seals are correctly installed between all joints, we include the seals with every order! The exit from the wall must be via a BORA wall box only, which is double baffled and double insulated. 

BORA Eco flat ducting

BORA Ecotube ducting has rounded corners and internal flutes to guide the air flow around corners smoothly. Only BORA Ecotube should be used and as with the round ducting all joints should be sealed with the BORA seals and a BORA wall box ONLY should be used to exit the building.

Best practise for extraction ducting:

Plan you run before walls and ceilings are installed its much easier to adapt beforehand!

Ensure the duct as short as possible with as few bends as possible along its route to the outlet.

Avoid excessive bends, every bend reduce the speed the air travels.
Cavity walls need to be crossed by the ducting completely without any joints or bends.

If using a roof outlet use a double-walled roof outlet with an adequate capacity.
Ensure adequate ventilation, fresh air needs to be allowed in by opening a window or external door slightly or by means of a ventilation louvre.
Incorrect installation can result in poor extraction, more noise, condensation and other undesirable effects. The most common issues we find are the use of 125mm or even 100mm duct pipe, causes excessive noise with very little extracted air. The steam then condensates on the metal or glass of the extractor, all because the incorrect ducting is used. Remember 150mm rounds as a minimum or equivalent rectangular ducting only.

What if i cannot duct to the outside?

There are certain circumstances where ducting externally is not possible, for example in a block of flats, or the run is blocked by steelwork. BORA has the solution this, with the use of highly effective recirculation technology.