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UL 2556 規定如下:4 @& c7 K9 o7 d) V) _& G: k
5 V2 g" B- X" L( c7 X8 g2 Wi) a forced air-circulating oven. The apparatus for the air-oven aging of specimens shall be as
3 ]2 y+ A& f7 [3 V/ b4 ^2 Yindicated in NMX-J-417-ANCE or ASTM D 5423 (Type II ovens) and ASTM D 5374 and shall
3 o/ F4 _- ^5 {& F, ^8 Rcirculate the air within the aging chamber at high velocity. Fresh air is to be admitted,
/ |3 Q; a9 B/ c, ccontinuously, to the chamber to maintain normal oxygen content in the air surrounding the" ]0 d' x( `7 l7 ]
specimens. The exhaust ports of the oven shall be adjusted to achieve 100 to 200 complete
# I' K. g0 T6 Z5 [' y8 e0 dfresh-air changes per hour. For purposes of calculating the number of fresh air changes the
; j M* [) X+ i$ t1 tvolume of the oven shall be based on the interior dimensions of the oven. The blower, fan, or* `2 R( Q+ }0 O
other means for circulating the air shall be located entirely outside the aging chamber. The oven
& K( j1 ^- {# D5 kshall be capable of maintaining the temperature specified in Table 3;
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