Excel Flanges and Accessories are tested
and certified by BSRIA, meeting the
relevant requirements in the BESA
(Building Engineering Services
Association) J-rated flange identification
system for Sheet Metal Ductwork DW/
144 third edition 2016.
EXCELAIR sand trap louvers are tested by
BSRIA in accordance with EN : 13181
2001 to determine the Sand Penetration
and the Pressure Drop versus Airflow
Curve, with the associated Coefficient of
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