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120 Minute Durasteel Fire Rated Ductwork

120 Minute Durasteel Fire Rated Ductwork

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Home Technical Data Fire Rated Ductwork 120 Minute Durasteel Fire Rated Ductwork

120 Minute Durasteel Fire Rated Ductwork

The SMT system is formed by fixing 9.5mm, DURASTEEL® sheets on to a welded or cleated, prefabricated steel skeletal framework, minimum 3mm thick. The sheets are fixed using self-drilling self-tapping screws, with PROMASEAL® mastic applied before fixing to the frame. Flanged lengths of ductwork are bolted together trapping the PROMASEAL® mastic between the mating flanges. The SMT system can be constructed in 1, 2, 3 or 4 sided configurations.

 

Ductwork Insulation Matrix

Natural Ventilation / Powered Ventilation / Smoke extract
Minutes Stability Integrity Rock Wool Insulation
Type A or B duct – 300°C smoke temperature Type A duct – 1000°C+ Type B duct -1000°C
30 Yes Yes SMT SMT SMT
60 Yes Yes SMT SMT + 30mm of 60 kg/m³ SMT + 50mm of 60 kg/m³
120 Yes Yes SMT SMT + 50mm of 60 kg/m³ SMT + 80mm of 140 kg/m³

 

 

 

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SpecUp - System Specification Wizard

Answer the 5 short questions below to receive your recommended Durasteel system specifications. Hover over the ? icons for a brief explanation.

Question 1/5

Type of system required?

Question 2/5

Fire rating required?

Question 3/5

Fire integrity-only or integrity and insulation?

Question 4/5

Fire attack risk from one side or both sides of the system?

Question 5/5

Blast rating required in addition to fire rating?

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