347 

Federal Aviation Administration, DOT 

Pt. 23, App. F 

(2) 

Radiant heat source. Mount the radiant 

heat energy source in a cast iron frame or 
equivalent. An electric panel must have six, 
3-inch wide emitter strips. The emitter strips 
must be perpendicular to the length of the 
panel. The panel must have a radiation sur-
face of 12

7

⁄

8

by 18

1

⁄

2

inches (327 by 470 mm). 

The panel must be capable of operating at 

temperatures up to 1300 

°

F (704 

°

C). An air 

propane panel must be made of a porous re-
fractory material and have a radiation sur-
face of 12 by 18 inches (305 by 457 mm). The 
panel must be capable of operating at tem-
peratures up to 1,500 

°

F (816 

°

C). See figures 

F3a and F3b. 

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