578 

14 CFR Ch. I (1–1–14 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 hous-

ing for test specimen 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 (manufac-

tured by Thermal Ceramics and available in 
Europe), or equivalent, either resting on the 
bottom lip of the sliding platform or on the 
base of the brackets. 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-combustible sheets of material are 
available in 

1

⁄

4

inch (6 mm) thicknesses. See 

figure 4. A sliding platform that is deeper 
than the 2-inch (50.8mm) platform shown in 
figure 4 is also acceptable as long as the sam-
ple height requirement is met. 

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