Declarations

EC Documentation

Classifications

Air leakage classification (airtightness)

In standards specifying test methods for determining a ventilation unit’s airtightness in relation to air leakage, there are no standardised methods as yet for decentralised ventilation units such as Airmaster’s. Airmaster has therefore chosen to test according to two standards, and to disclose both results.
One standard, EN 1886, is used for central systems that operate with high system pressure. The second, EN 13141-7, is a standard typically used for smaller central systems that operate with lower system pressure, e.g. for residential ventilation.

Airmaster product design

  • When developing new Airmaster ventilation units, it is our goal to achieve the best air leakage classification A1, according to standard EN 13141-7. This means less than 2% of the airflow, both in relation to internal and external leakage.
  • Airmaster’s units typically show an air leakage of 1–2% according to the test conditions.
  • External TÜV tests are performed on all units by TÜV-SÜD.

EN1886

According to EN1886, the air handling unit is tested at 700 Pa pressure difference. This is intended for larger central ventilation systems and is therefore not as relevant for smaller decentralised units, which operate under significantly lower pressure conditions. What’s more, the test only looks at external leakage and not internal leakage, which is also important. Leakage is rated in relation to the surface area of the unit.

 

Air leakage classification according to standards

Air handling unit

EN1886

EN 13141-7

AM 150

L1

A1

AM 300

L3

A1

AM 500

L2

A2

AM 800

L2

A1

AM 1000

L2

A1

EN 13141-7

EN 13141-7 is the standard that TÜV-SÜD has found most relevant to our type of unit. It was originally intended for residential ventilation systems, which have pressure conditions corresponding largely to Airmaster ventilation units. EN 13141-7 furthermore looks at both external and internal leakage. Leakage is rated in relation to nominal airflow, which we find relevant.

Classification according to EN1886

Allowable air leakage rate in relation to leakage class for air handling units operating under both negative and positive pressure [EN 1886:2007, section 6.1.2, table 5]:

Air leakage class for air handling units

Allowable air leakage at 700 Pa positive pressure

L1

0.22 l/s per m² unit surface

L2

0.63 l/s per m² unit surface

L3

1.90 l/s per m² unit surface

Classification according to EN 13141-7

Allowable air leakage in relation to leakage class for air handling units with recuperative heat exchanger (e.g. countercurrent heat exchanger) [EN 13141-7:2010, section 6.2.1.2 Table 2]:

Air leakage class of air handling unit

Internal leakage
(at 100 Pa)

 

External leakage

(at 250 Pa)

A1

≤ 2%

and

≤ 2%

A2

≤ 5%

and

≤ 5%

A3

≤ 10 %

and

≤ 10 %

Not classified

> 10 %

and

> 10 %

Declarations and approvals

DIBt type approval

iF Product

iF Communication

HVR Awards, 2012

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