Standards – non-grease
The range of FLAMEBAR BW11 fire duct has been tested by Underwriters Laboratory (UL), and evaluated by Intertek and other International Accreditation Services test facilities, in accordance with ISO Standard 6944 (1985).
The range was tested for vertical and horizontal ductwork, with fire inside and outside the duct, in excess of four hours’ stability, integrity, and insulation for ventilation ductwork, smoke exhaust ductwork, or grease ductwork.
FLAMEBAR BW11 fire duct has the UL Classification and listed is by Intertek for up to four hours fire rated ductwork.
FLAMEBAR BW11 has been tested by UL to determine compliance with NFPA 90A (Installation of Air Conditioning and Ventilation Systems) for flame spread and smoke development with the following results:
Test conducted in accordance with UL Standard 723 Test for Surface Burning Characteristics of Building Materials (ASTM E84).
FLAMEBAR BW11 fire duct has also passed the hose stream test to ASTM – E119 with water pressure of 30psi for 2 1/2 minutes.
Impact test of FLAMEBAR BW11 fire duct
Impact and strength to UL 1978
17- Vertical support test.
18 – Strength test – 18-1 and 18-2 impact test.
18 – Strength test – 18-1 and 18-3 longitudinal force test.
18 – Strength test – 18-1 and 18-4 load test for grease elbows.
18 – Strength test – 18-1 and 18-5 grease duct joint load test.
Exterior weathering of FLAMEBAR BW11 fire duct
Duplicate samples were placed on the exterior weathering frame and left totally exposed since January 1993. The results so far show:
- Some dirt pick-up, which can be washed off
- No mold growing
- No chalking
- Material has remained totally intact.
Inspection report to Bodycote Warrington Fire, an IAS facility, confirming durability of FLAMEBAR BW11 coating and duct system since 1995. Confirming no deterioration of the coating or duct, including thickness applied.
Considering the length of time the samples have been exposed, the material is in good condition.
Artificial weathering of FLAMEBAR BW11 – OUV weatherometer
The samples undergoing artificial weathering have undergone over 22,000 hours of alternate UV and condensation cycling, which is extremely excessive; normally 1,000 hours is sufficient to predict whether a material is suitable for exterior/semi-exposed conditions. 22,000 hours is equivalent to 60 years’ external exposure.
Expansion of FLAMEBAR BW11 fire duct
As all steel expands with temperature, there will naturally be an expansion of fire duct under fire conditions, as follows:
At 2012°F an expansion of 0.016in per inch
At 1112°F an expansion of 0.008in per inch
At 806°F an expansion of 0.006in per inch
Thermal properties of FLAMEBAR BW11 fire duct
‘U’ value – thermal transmittance.
FLAMEBAR BW11 without insulation = 0.88 Btu/ft²/hr°F
FLAMEBAR BW11 with 2in insulation = 0.147 Btu/ft²/hr°F
FLAMEBAR BW11 with 4in insulation = 0.08 Btu/ft²/hr°F
Chemical resistance of FLAMEBAR BW11 fire duct
The coating has been tested in:
Standard 10% solutions of the following acids:
Hydrochloric, nitric and sulphuric.
Standard 10% solutions of the following alkalines:
Sodium hydroxide and potassium hydroxide.
The following solvents:
Xylene and acetone.
After ten days’ total immersion, all the above chemicals failed to cause a breakdown of the product structure.