Downspout guard, kit therefor, and method of assembly

A downspout guard comprising:

• a housing consisting of five walls formed from one single piece of a perforated material having openings therethrough with an open area ratio between 60% to 65%, wherein the five walls each extend and are formed to be uninterrupted from edge to edge of each of the walls and consist of:
• two opposed sidewalls consisting of a front sidewall and a back sidewall;
• two opposed end walls that provide filtration and drainage;
• and
• a top wall connected to the sidewalls and the end walls with each of the sidewalls and the end walls continuously extending perpendicularly from the top wall and that provides drainage while providing filtration, wherein a space between the two opposed side walls and the two opposed end walls and extending away from the top wall is completely open and when installed in a gutter that includes opposed front and back walls connected to a bottom wall, bottom surfaces of at least the end walls engage the gutter bottom wall of the gutter, and during operation, at least the two opposed end walls configured with the openings therethrough with the open area ratio between 60% to 65% and the perpendicular extension from the top wall that provide filtration to block passage of debris and particles smaller than any of the openings in the material to form a filter cake.