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Ventilation Testing Part F

The aim of the Ventilation Testing Part F is to test the air flow measurements in new buildings. The test ensures that the ventilation systems have been properly configured. There are four types of test: Bulk, Intermittent extractor fan, and MHVR System. This article explains each of these in detail. Whether you're looking to test a new build or an existing one, the Part F test can help you get started.
Ventilation Testing Part F
Ventilation Testing Part F

Table of Contents

MHVR Systems

As part of the Building Regulations, Ventilation Testing Part F requires a building to meet the minimum air quality requirements for occupant comfort. If a building does not meet these requirements, its occupants’ health could be at risk. In particular, poor ventilation can lead to mould and a poor indoor climate. To ensure the health of occupants, ventilation systems must be tested regularly. There are many factors to consider when choosing a ventilation system.

Ventilation testing is an important part of the building regulations process, so it is vital that buildings are designed and installed correctly. Part F is particularly complex and difficult to enforce. This is because of the requirements in Building Regulations Part F for new dwellings. The regulations require that ventilation be tested with calibrated equipment by a qualified engineer with domestic ventilation technologies. All our ventilation engineers have successfully completed a course on domestic ventilation technologies.


Multivent MEVs can be used to meet the requirements of Building Regulations part F. These tests are carried out to verify whether the MEVs used in the testing of ventilation systems meet acceptable noise levels in habitable rooms. According to Building Regulations part F, MEVs should meet the limits of noise in a room that is maintained at a desirable level of humidity and acoustic quality. The noise levels are measured using sensors that detect air quality. Boost mode or background ventilation rates should be used to achieve the limits. If noise is a significant issue, project noise limits can be set as low as possible.

The ventilation requirements in Part F aim to reduce the amount of pollutants in the air. The range of pollutants can differ depending on the type of building. For example, industrial buildings may have a greater range of pollutants than domestic buildings. Flow rates are also an important component of ventilation testing, and must meet minimum standards. The noise levels of intermittent extractor fans should be assessed using the same guidelines as the MEVs. MEVs are a good solution to the problem.

Intermittent extractor fans

Building regulations require that ventilation systems be tested and certified. Part F is the Building Regulations section that covers all intermittent extractor fans. Testing is required to show that fans meet minimum airflow standards and are compliant with regulations. The results should be submitted to the relevant building control body for approval. Intermittent extractor fans should be tested by a UKAS accredited company, so that they comply with Building Regulations.


Generally, intermittent extract ventilation systems come with performance figures, such as air flow in litres per second. For example, a bathroom extract fan should extract at 15 litres per second. But many fans don’t meet these figures. Some of this is down to poor ductwork design and installation. A vane anemometer is a measuring instrument that is held up to the fan terminal, and the results of the test are documented in a report.

Bulk test method

The Bulk test method for ventilation testing Part F specifies a method for measuring the air change in an indoor zone. The method includes a range of air changes and is commonly used to check the efficiency of mechanical ventilation systems. The method is applicable to various materials, including foam plastic, polyisocyanurate, and expanded polystyrene. Relevant test methods include ASTM D3330 and D3330M-04. The relevant method is ICC-ES AC12 and is also applicable to CFR Title 16, Part 460.

The Part F regulations are a government-set standard of ventilation standards. They specify ventilation levels and rules relating to condensation. If you have a problem with condensation, you may find that black mould is growing, which is harmful for occupants’ health. To avoid these problems, hire an experienced Part F tester to check every extract vent in your building. The testing requires a specialist piece of equipment called a balometer. It is a fast process that is performed by an experienced Part F tester.

Air pressure test

The following requirements should be met during an air pressure test for buildings: the baseline building pressure must be 15 Pa or greater and it must be measured at a location within 1000 feet of the building’s elevation. The target induced pressure must be between 60 and 15 Pa, with the low end reduced to four Pa plus the absolute value of the baseline pressure. A building’s elevation and type of ventilation system will determine the target induced pressure.

Ratio Seven is responsible for performing air tightness tests, which include pressure test results in m3/m2h at 50 Pa and a wealth of metadata about each test, including air permeability design target and ventilation strategy. The dataset is a valuable resource for building owners, contractors, and inspectors, and is available on its website.

Water flow rate calculations

There is a lot of controversy regarding the typical values of ventilation coefficients. However, the best method is to analyze the ventilation situation in detail and choose custom values. For example, the default values of EnergyPlus are 1,0,0,0, which give the same volume flow rate of ventilation under all conditions. These values are also commonly known as ASHRAE defaults. In addition, the ASHRAE Manual of Fundamentals provides a detailed procedure for determining custom coefficients.

In ventilation testing part F, the trickle rate and boosted rate are combined. The sum of these two rates must meet the total ventilation rate of the entire dwelling. If the trickle and boosted rates are not equal to the whole dwelling rate, further adjustments must be performed. This includes considering the size of the fan unit and the ducting installation. If the whole dwelling ventilation rate is not met, the extracts must be boosted or adapted to the existing airflow rate.

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