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Therm-X MVHRU HR95
Technical Manual
Page 43 of 59
Version 2.4, 25/09/2020
14.6.
RECTANGULAR DUCT ATTENUATORS
The
SPTREC
,
SPTBRL
and
SPTBUD
rectangular straight or bend sound attenuator is designed for reducing the
noise propagated through the HVAC ducting connected to the unit. The attenuator comes in 3 standard lengths of
900mm, 1200mm and 1500mm respectively.
The 25mm deep double skinned housing is manufactured of pre-galvanized steel with stiffened internals and
proprietary flanges.
The splitters and side linings contain a sound absorbent infill that is encapsulated with glass cloth and
plain/perforated steel. The splitters have an aerodynamic fairing at each end.
All attenuators are manufactured in accordance with the DW 144 specification for medium pressure Class B
ductwork.
Straight
Unit
Type
Attenuator Order Reference
0.9m
1.2m
1.5m
HR95-080-V
SPTREC-250x400x900 SPTREC-250x400x1200 SPTREC-250x400x1500
HR95-150-V
SPTREC-400x450x900 SPTREC-400x450x1200 SPTREC-400x450x1500
HR95-250-V
SPTREC-500x500x900 SPTREC-500x500x1200 SPTREC-500x500x1500
HR95-350-V
SPTREC-700x500x900 SPTREC-700x500x1200 SPTREC-700x500x1500
HR95-450-V
SPTREC-700x500x900 SPTREC-700x500x1200 SPTREC-700x500x1500
HR95-550-V
SPTREC-1000x500x900 SPTREC-1000x500x1200 SPTREC-1000x500x1500
HR95-080-H
SPTREC-300x200x900 SPTREC-300x200x1200 SPTREC-300x200x1500
HR95-150-H
SPTREC-500x250x900 SPTREC-500x250x1200 SPTREC-500x250x1500
HR95-250-H
SPTREC-600x300x900 SPTREC-600x300x1200 SPTREC-600x300x1500
HR95-350-H
SPTREC-700x400x900 SPTREC-700x400x1200 SPTREC-700x400x1500
Bend Right/Left
Unit
Type
Attenuator Order Reference
0.9m
1.2m
1.5m
HR95-080-V
SPTBLR-250x400x900 SPTBLR-250x400x1200 SPTBLR-250x400x1500
HR95-150-V
SPTBLR-400x450x900 SPTBLR-400x450x1200 SPTBLR-400x450x1500
HR95-250-V
SPTBLR-500x500x900 SPTBLR-500x500x1200 SPTBLR-500x500x1500
HR95-350-V
SPTBLR-700x500x900 SPTBLR-700x500x1200 SPTBLR-700x500x1500
HR95-450-V
SPTBLR-700x500x900 SPTBLR-700x500x1200 SPTBLR-700x500x1500
HR95-550-V
SPTBLR-1000x500x900 SPTBLR-1000x500x1200 SPTBLR-1000x500x1500
HR95-080-H
SPTBLR-300x200x900 SPTBLR-300x200x1200 SPTBLR-300x200x1500
HR95-150-H
SPTBLR-500x250x900 SPTBLR-500x250x1200 SPTBLR-500x250x1500
HR95-250-H
SPTBLR-600x300x900 SPTBLR-600x300x1200 SPTBLR-600x300x1500
HR95-350-H
SPTBLR-700x400x900 SPTBLR-700x400x1200 SPTBLR-700x400x1500