Notice water bubbles on exterior fan. High humid days can cause fans to condense. It's better to install outside and let them drip in the grass and not in the attic.
Mold – Garage Pipe
Condensation on garage pipe causing drywall to become saturated with water and mold. Water also dripping on the garage floor.
Mold – Interior Pipe
Interior pipe with mold. No fire dampers and thin wall pipe both against code.
Mold – Thin Wall Pipe
Construction cutting cost. Thin wall pipe not approved inside.
Mold – Radon Fan
Radon fan covered with mold.
Mold – Piping
Mold on piping.
Mold – Attic Radon Fan
Attic fan covered with mold.
Mold – Attic Fan
Attic fan covered with mold,
Mold – Exterior Fan
Exterior fan covered with mold.
Mold – Thin Wall Pipe
Thin wall pipe in the garage covered with mold.
Mold – Pipe
A wrong fire damper for the pipe could be a fire hazard.