422 

14 CFR Ch. I (1–1–19 Edition) 

Pt. 25, App. F 

(i) 

Electric radiant panel. 

The radiant panel 

must be 3-phase and operate at 208 volts. A 
single-phase, 240 volt panel is also accept-
able. Use a solid-state power controller and 
microprocessor-based controller to set the 
electric panel operating parameters. 

(ii) 

Gas radiant panel. 

Use propane (liquid 

petroleum gas—2.1 UN 1075) for the radiant 
panel fuel. The panel fuel system must con-
sist of a venturi-type aspirator for mixing 
gas and air at approximately atmospheric 
pressure. Provide suitable instrumentation 
for monitoring and controlling the flow of 
fuel and air to the panel. Include an air flow 
gauge, an air flow regulator, and a gas pres-
sure gauge. 

(iii) 

Radiant panel placement. 

Mount the 

panel in the chamber at 30

° 

to the horizontal 

specimen plane, and 7

1

⁄

2

inches above the zero 

point of the specimen. 

(3) 

Specimen holding system. 

(i) The sliding 

platform serves as the housing for test speci-
men placement. Brackets may be attached 
(via wing nuts) to the top lip of the platform 
in order to accommodate various thicknesses 
of test specimens. Place the test specimens 
on a sheet of Kaowool M

TM

board or 1260 

Standard Board (manufactured by Thermal 
Ceramics and available in Europe), or equiv-
alent, either resting on the bottom lip of the 
sliding platform or on the base of the brack-
ets. It may be necessary to use multiple 
sheets of material based on the thickness of 
the test specimen (to meet the sample height 
requirement). Typically, these non-combus-
tible sheets of material are available in 

1

⁄

4

 

inch (6 mm) thicknesses. See figure 4. A slid-
ing platform that is deeper than the 2-inch 
(50.8mm) platform shown in figure 4 is also 
acceptable as long as the sample height re-
quirement is met. 

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