Patent ID: 8517054

Claim:
A flow resistance device, which is configured in an electronic device, comprising: a base, wherein a channel is formed thereon for allowing air flow to pass, the base comprising a first slideway, the first slideway comprising a plurality of positioning holes; a blocker disposed at the channel and forming a plurality of openings with fixed shape; wherein the blocker is disposed within the first slideway; a board disposed on the base and moveable in the first slideway so as to be moved relative to the base and the blocker between a first position and a second position of the base and the blocker; and a position part for selectively engaging with one of the positioning holes and the board for maintaining the board at a selected position of the base; wherein the blocker is a plate and when the board is moved with respect to the blocker to be positioned at the first position, the cross-section of the plurality of openings for the air flow to pass is smaller than the cross-section of the plurality of openings for the air flow to pass when the board is moved with respect to the blocker to be positioned at the second position.