This is a typical situation, whoever installed this dryer vent didn’t bother to cut it to length and just shoved the whole thing into the corner. It’s best to use the absolute minimum of flex duct. That 180 degree bend is a trap for lint, which eventually clogs the vent and poses a fire hazard. […]

Seriously, a flue cap and spark arrestor keeps rain, debris and critters out of your chimney. This chimney could use some new mortar too. Bonus points if you spot the tiny seedlings in the upper left corner. This is how you get trees growing out of your house.