HVAC Air Handler
The NFPA is the governing body responsible for writing fire and smoke code standards. Building codes often reference the NFPA 90A HVAC system standard to be complied with. In turn, State and local Municipalities often write building codes that require NFPA standards be met.
Smoke inhalation is one of the chief causes of deaths of building occupants. Since the HVAC air transport system (air duct system) supplies air going to occupied areas of the building, it is logical to require ductwork does not contain combustible and smoke generating materials.
The NFPA 90A standard was written expressly for this purpose. It is conformed to by running the E-84 ASTM test entitled "Surface Burning Characteristics of Building Materials". Any material that passes and conforms to the Surface Burning test will have documentation indicating the flame and smoke spread of the material being offered. It is not unusual to request these documents, and have them available in your files.
To comply with NFPA 90A, the material flame spread must be less than 25, and the smoke generation must be less than 50.
Pancrete T-84 is certified by an independent laboratory to meet and exceed NFPA 90A requirements. The Flame Spread of Pancrete T-84 is 20. The Smoke rating of Pancrete T-84 is 35.
Pancrete is used for many different applications other than condensate drain pans where corrosion must be halted or water and chemical resistance must be assured. Standard Pancrete is used in these situations.
The auto-ignition temperature of standard Pancrete is over one thousand one hundred degrees before ignition takes place.
To put this into perspective, galvanized metal itself is melted about 750 deg F. , well below Pancrete's ignition temperature.
Pancrete meets a variety of practical safety concerns, both from a fire standpoint, VOC levels, and air quality concerns.