The Air Tightness Testing and Measurement Association, ATTMA, has released an update to ATTMA Technical Standard L4 (TSL4) – Measuring Air Permeability in Passivhaus & Low Energy Buildings – Fan Pressurisation Method.
This minor update amends the changes to the AECB building standard by providing details on the 3 levels that are now in the standard. This can be found on Table 1 on Page 5 and as seen below
|Ventilation Strategy||Target Air Change Rate N50|
|PHI Low Energy Building||≤1.0|
|AECB CarbonLite Standard Level 1||≤5.0|
|AECB CarbonLite Standard Level 2||≤2.0|
|AECB CarbonLite Standard Level 3||≤1.5|
If you have any queries, contact Paul Carling, ATTMA Technical Manager on email@example.com or 01494 358 159