Fairchild Stealth 4A/600V direction question

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does Fairchild Stealth 4A/600V has direction? as the 1N4007 Rectifier Diode i am trying to replace it with has the direction .

Saw some diy page that they put heatshrink enveloping the rectifier. will it get hot and finally cease to work? or it will be just fine to eliminate short?

thx in advance
 
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