PRODUCT COVERED
Flexmaster - Flexible Air Ducts - UL 181
PRODUCT DESCRIPTION
The product covered by this report is Air Ducts consisting of a wire helix reinforced film core, with or without insulation and vapor barrier.
MODELS
1B, 1M, 3B, 3M, 5B, 5M, 4M, 4B, 4NI, 6B, 6M, 9M, 8B, 8M.
RATINGS
| UL 181 |
Reaction to Fire Classification |
Uninsulated flexible duct |
Class 0* |
| UL 181 |
Reaction to Fire Classification |
Insulated flexible duct |
Class 1** |
FLAME SPREAD RATINGS
| Test Standard |
Flame Spread |
Smoke Development |
| UL723 |
25 or less |
50 or less |
* Class 0 – Air ducts and air connectors having surface burning characteristics of zero.
**Class 1 – Air ducts and air connectors having a flame-spread index of not over 25 without evidence of continued progressive combustion and a smoke-developed index of not over 50.
Note: A representative sample of the listed devices has been tested, investigated and found to comply with the requirements of the Standard(s) for UL 181:2013, "Standard for Factory Made Air Ducts & Connectors" and are identified with the ETL Listed Mark.
