Allowable Flue Gas Temperatures
Max Continuous 650°C (1200°F)
Brief Forced Firing 925°C (1700°F)
Tested To 1150°C (2100°F)

Clearance to Combustible Materials
ULTRABlack is certified for 6" clearance with the following exception. When ULTRABlack is used as the connector on a mobile home certified stove the clearance is determined by the installation instructions for the specific stove model being installed.

Construction
Flue: .016" stainless steel.
Casing: .019" satin coat steel. Satin coat is specifically designed to be painted.
Seam: Interior and exterior seams are seam welded.
Wall thickness: Approximately 3/8"
Paint: Forrest “Stove Bright” flat black

Slip lengths are available in 6", 12" and 18". 
Adjustable Lengths combine a 36" length and a 36" slip length in one box. The UBAF fits all brands of insulated chimney and most brands of wood burning stoves without a stove or chimney adapter.
A UBTC trim collar is included with the UBAF.
Slip Lengths slide over a regular straight length allowing you to adjust the overall length of a straight run without cutting. The minimum adjustment can be reached only if the length used below the slip length is long enough to accept it.