Abstract: A roof vent for obstructing snow from entry into a vented space of a structure or dwelling. The vent has a cover, support, and base. The base is adapted to form a passageway which connects the vented space to the environment. A barrier is also provided which is located within the passageway. The barrier permits air movement but causes snow to accumulate thereon which prevents accumulation in the vented space.

Abstract: A fixing device disposed on an opening of a guiding tube for fixing a heat sink on the opening is disclosed. The fixing device includes a circular rib and three elastic fixers. The circular rib is set around the opening for depositing the heat sink and sealing seams between the opening and the heat sink when the heat sink is assembled onto the opening. The first elastic fixer is set on the circular rib and has a first inclined plane for fixing the heat sink on the opening by pulsing the first inclined plane against the heat sink along a first direction. The second elastic fixer is set on the circular rib and has an indent for fixing the heat sink on the opening by locking the heat sink in the indent to prevent the heat sink from moving along a second direction. The third elastic fixer is set on the circular rib and has a contact structure for pushing the heat sink along a third direction. The first, second, and third directions are perpendicular to each other.