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.

Overview
People affected4 accounts across 1 forum
Workarounds found8 items attempted
Community agreement23 total upvotes
Editorial ConsensusSynthesized across r/hvacadvice
Verification standards →

Core Friction Pattern

Analysis of 4 peer accounts across online developer and community forums reveals that “Landlord installed a dangerous makeshift furnace exhaust vent” repeatedly surfaces due to edge-case mismatches between standard defaults and real-world environments. Standard troubleshooting frequently falls short, compelling practitioners to develop custom workarounds.

Top Peer-Reported Fix
Contacting the management company to send a maintenance technician

+7 alternative community-tested workarounds cataloged below.

Editorial Commitment: Every workaround and quote here is curated from verified public discussions without affiliate commissions or paid placements. Always review system configurations before applying community-tested solutions.

What people tried

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

Found another way around this?

Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.

  1. 1
    Contacting the management company to send a maintenance technician
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  2. 2
    Considering DIY repair by purchasing tools and supplies from a hardware store
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  3. 3
    Calling the gas company to red tag the furnace
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  4. 4
    Contacting the local building inspector or housing department
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  5. 5
    Shutting off the furnace immediately
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  6. 6
    Checking whether the appliances are natural draft or induced draft
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  7. 7
    Inspecting the venting setup for backdraft signs
    Did this help you?
  8. 8
    Planning to call a home inspector or professional to verify code violations and have the contractor redo the work
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Tried another approach not listed above?+ Share your workaround ↑

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/hvacadvice4 people · September 2026 – October 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

“When putting in the liner, the company also combined the furnace and water heater into one vent.”source ↗

“My question is when one of the appliances is venting (more so the chimney since the output would presumably be higher) what stops it from just venting out the other side and not up the actual chimney?”source ↗

BlizzardHockey · r/hvacadvice · 7 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

“Sounds like I have a problem that will need fixing 🫠”source ↗

BlizzardHockey · r/hvacadvice · 3 upvotes

“It looks to me like the furnace portion is actually pitched down toward the water heater, which is bad.”source ↗

Tels315 · r/hvacadvice

Where this came up

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