Upon arrival, inspected system and found no current problems. Homeowner informed me that furnace was flashing a code 3. Trudge through 2foot deep snow to check vent pipe. Pipe is buried on roof with snow. Chop intake stuff towel into fresh air side and allow furnace room to intake air. -homeowner wants a 90 installed and the pipe capped off with 2” cap to prevent future problems. Informed him to have a handyman cut an intake into furnace room using return grills before installing cap and 90. May change it to having drain added and pipe extended on roof not sure of direction to go.