Said It Here

Landlord installed a dangerous makeshift furnace exhaust vent

Landlords frequently use improper materials like dryer vent hoses, blocked chimneys, or makeshift plywood window blocks for gas furnace exhaust. This leaves tenants terrified of carbon monoxide leaks and fire hazards near their bedrooms, with management companies and handymen failing to fix the issues correctly.

What people tried

Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.

  1. 1
    Contacting the management company to send a maintenance technician
  2. 2
    Considering DIY repair by purchasing tools and supplies from a hardware store
  3. 3
    Calling the gas company to red tag the furnace
  4. 4
    Contacting the local building inspector or housing department
  5. 5
    Shutting off the furnace immediately

In their words

Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.

r/hvacadvice2 people · September 2026

“While doing some roof work the handyman noticed the chimneys were concreted shut. I was concerned and brought it up to the landlord since the 1978 era natural gas furnace is vented to the chimney.”source ↗

“He rerouted the exhaust out through a piece of plywood he blocked a basement window. The outdoor portion of the vent is a metal vent boot with the plastic pest screen and back draft damper. All of this screams fire and CO leak to me.”source ↗

vanwilliam1960 · r/hvacadvice · 10 upvotes

“Shortly after move-in I discovered the furnace exhaust vent was actually a dryer vent hose with burnt tape around it.”source ↗

“After having a "certified maintenance technician" from the fairly large management company come repair the furnace "properly", I am still suspicious that the job isn't done correctly.”source ↗

“Since the heater is upstairs next to every bedroom I am concerned about the connection of the new vent into the existing and any carbon monoxide issues.”source ↗

Jonanae · r/hvacadvice · 3 upvotes

Where this came up

People with this problem also raised