A specialist UK based supplier of industrial and compressor filters

Provent Crankcase Breathers


Oil separator for closed and open crankcase ventilation


The development of the whole MANN+HUMMEL ProVent product family was directed towards the newest generation of industrial diesel engines. ProVent sets the standard for crankcase ventilation and offers important advantages:


Available to buy online HERE

• Highly efficient oil separation
through high performance
• Excellent protection for the
turbocharger and components
fitted downstream
• Integrated safety feature
against irregularly high
crankcase pressure
• Low installation height to
oil level possible through
low pressure drop
• Lower engine oil consumption
in comparison to less
efficient separators or to
conventional open systems
without an oil separator
• Easy to service through
quick access and protection
against incorrect insertion
of replacement element
• Suitable for universal use
with different flow rates
• Excellent flexibility for
choice of installation position
and ports
• Compact and light design,
but robust
• No auxiliary power required
• Extremely reliable, also at
low temperatures
• Very low running costs
• All ProVent products are
suitable for use with open
or closed crankcase ventilation

All the available units can be fitted to Diesel and also petrol engines, in petrol engines they can be used in place of after marker catch cans, using this unit the breather system returns the oil carryover to the engine. Stops the build up of deposits in cam covers amongst other advantages. In a TDI application it would go between the Crankcase Breather and Turbo Inlet Pipe to catch any oil whist maintaining the closed breather system. This will reduce the amount of oil found in your Intercooler Pipework, Turbo Housing and TIP Pipe.

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Crankcase ventilation - variety and expertise

In internal combustion engines, an oil-laden leakage gas known as the blow-by is produced in the crankcase.
The blow-by must be returned during the combustion process, which is achieved by closed crankcase ventilation (CCV) systems. CCV systems also separate and return the oil to the crankcase and regulate pressure in the crankcase.

MANN+HUMMEL can supply all the components and systems involved in crankcase ventilation, including:
• Oil separators
• Pressure regulating valves
• Heating pipes
• Valve technology (anti-drain valves, PCV valves, ventilation valves)
• Integration of crankcase ventilation into cylinder head covers or other integrated solutions

With increasingly strict emissions legislation, the requirements for oil separation have increased continually over the past few years. Emissions-related engine components such as exhaust turbo chargers, charge air coolers and charge air sensors must be protected against performance degradation from oil contamination. MANN+HUMMEL provides various designs for oil separation, ranging from inserted or non-inserted inertial separators, such as cyclonic or impactor separators, to the ProVent fibre separator for HGV and industrial use.

The ProVent system integrates a powerful oil separator element and a pressure regulator element, both characterized by their robust and light-weight designs. ProVent protects the turbocharger and the downstream engine components from the build-up of oily deposits that diminish performance. This commercial concept is designed for industrial engines with a power of up to approx. 1250 kW and can cover volume flows of approx. 10 to 1000 liters per minute (l/min) blow-by.
The series is complemented by safety valves that allow for multiple applications.

Call our sales team 01978 855995 for all enquiries or use our contact form and we will respond to your requests

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Here to help

With years of industry experience, our team of filtration specialists can offer expert advice on all of your filtration requirements.