Abstract: A latch mechanism adapted to lock a movable pull roll support to a fixed pull roll support in a mineral fiber attenuation apparatus. A latch arm is pivotally attached intermediate its length to the movable support and is spring biased into locking engagement with a latch seat on the fixed roll support. The latching surface of the latch arm and the mating surface of the latch seat are substantially perpendicular to a plane extending through the end of the latch seat and the pivotal attachment. This causes the latch to release upon relatively low pressure being applied to the opposite end of the latch arm.