Intercooler matrix
An intercooler matrix was a feature of Jem'Hadar fighters. 

In 2375, Bronok and four other members of the Cardassian Rebellion planted a bomb in a fighter's intercooler matrix, despite the fact that Kira Nerys had told them to plant it in the secondary plasma relay. Garak added that the intercooler was the obvious choice for sabotage, because Jem'Hadar make security checks, and had the Cardassians not been lucky and the Jem'Hadar not been sloppy, they could have found the bomb and disarmed it before the ship left orbit. ()

See also 
 Intercooler

External link
 

de:Zwischenkühlermatrix
Spacecraft components